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Chemistry Lecture 2 For General Chemistry and Inorganic Chemistry — Transcript

by Jan Bernel Padolina · 7,653 words · 1,513 segments · language en · Watch on YouTube

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0:01Okay.
0:03Soan, we're now uh recorded. Okay. So
0:07today is August 22,
0:102026. Together with me is MT1
0:15ah A. Tama.
0:18Pa-thumbs up naman class if you guys are
0:20MT1A. Tama.
0:23Okay. So this recording is uh also with
0:28uh compliance with the HR okay as
0:32evidence that we have uh conducted our
0:34session today. Okay. So our topic is
0:39standards for measurement no. So
0:44uh class let me ask no let's begin our
0:47topic with a question no
0:51is measurement important?
0:55Can we live without measurement? Sige
0:58nga you just chat ha. Yung recitation
1:01niyo will be calculated uh through chat.
1:04Will be recorded through chat.
1:07M
1:13sige nga. Why is it important? Why do we
1:15need to measure things?
1:19Ba pwede namang
1:21o ito ka ito sayo ito kanya ba
1:26accuracy. Okay. So I would accept this
1:30answer no. So um measurement measurement
1:34daw is important. for accuracy according
1:38to Miss uh Gagarin no. Ayan
1:44yan. Okay
1:46oh
1:50ano recitation is important.
1:57Ano we always need [tawanan]
2:00instrument regarding with okay what
2:03parang iba to ah. Ai ba y'yan? [tawanan]
2:08Reation is important. Okay. O sige sige
2:10sige. [tawanan]
2:12Ayun. Okay. Sige pa. Iba pa. Iba pang
2:15reason.
2:16Iba pang reason. Sige. Um
2:21why is measurement important? No.
2:29To know the exact amount. Correct. No.
2:32Yung word na exact accuracy. Ano pa?
2:36Ayan.
2:38help us accurate results.
2:44Facts instead of guessing.
2:47Standard way to describe how much or how
2:50big. Okay.
2:53O sige sige. Okay. Okay. Last na to ha.
2:55Ayan na. Okay na. Okay. Okay class. So
2:59lahat ng na-thumbs up ko ano will be
3:00calculated as uh or will be counted as
3:03recitations no. Okay. Um, we do
3:06measurement. Tama naman. To be accurate,
3:09to be exact, to be um
3:13precise, no? To stop from guessing, no?
3:17Para hindi kayo manghula. Okay. Now, our
3:22society no uses measurement.
3:26Halimbawa class, kung hindi tayo
3:29magsusukat, magbibilang no.
3:32Ah
3:34papaano 'yung sa pera ' ba magbabayad ka
3:37hindi mo ano 'yun halimbawa 500 lang ang
3:40babayaran mo binigay mo yung buong 1,000
3:43okay na 'yun ba so lugi ka 'di ba meron
3:48ka pang sukli dapat 'di ba for example
3:52papaano sa mga lupain ' ba halimbawa o
3:55apo mula dito hanggang doon sa dulo ng
3:58bundok na 'yon okay 'yan ng kalupaan
4:02natin. Okay? Pero ang nakalagay sa title
4:04sa sa titulo, halimbawa 2 hectares lang
4:09o 'di ba? So magkakaroon tayo ng
4:12problema. Magkakaroon tayo ng ano chaos.
4:17It would be a chaotic society if there's
4:20no measurement ba. Okay. So it's one of
4:25the reason bakit importante ang
4:28measurement no to place accuracy and
4:32precision no and of course it would it
4:37would uh
4:39promote order no? Nasa ayos nasa tama.
4:44Okay? Ayan.
4:46So,
4:48okay, may nag-message pa dito. Okay.
4:52So, standards for measurement.
4:55measurement should be careful and should
4:57be accurate. Okay, so careful and
5:03accurate.
5:05Okay, it is important in constructing
5:08things and even in the laboratory.
5:13There are chemical reactions that needs
5:16accuracy.
5:18Hindi pwedeng sobra, hindi pwedeng
5:20kulang.
5:21Hindi rin pwedeng um
5:24hinulaan mo lang no. Ayun. Okay.
5:30Now for this lecture we have scientific
5:33notation, measurement and uncertainty.
5:37Significant figures. Ire-review natin.
5:40Significant figures in calculation
5:43metric system
5:45dimensional analysis. Ito
5:47pinakaimportante. Okay. Percentage
5:52measurement of temperature and then of
5:54course ah density no?
5:59Okay.
6:01Scientific notation. Sino ba sa inyo
6:03nakapag-sentific notation na? It is a
6:06way to write very large or very small
6:12measurement
6:14in a compact
6:16form. No? Ayan. So ano bang itsura ng ah
6:23scientific notation? O sino sa inyo
6:25nakaalala nito? Ah scientific notation.
6:29Ayan.
6:31So
6:34paano naman pathumbs up if you recall
6:37scientific notation yun. Okay. So, 'di
6:42ba ang scientific notation,
6:45okay, on this side,
6:49okay, dito mo nilalagay 'yung uh value,
6:53'yung numbers that are nonzero, 'di ba?
6:57Nandito 'yung mga nonzero.
6:59Tapos iyung mga zero, you remove them
7:03and
7:05count them, no? Pine-place mo sila sa
7:08exponent dito, no? So 10 rais to a
7:12power, no?
7:15Okay.
7:17If the number no dito is positive, so
7:22papano yung movement ng ating decimal
7:24point?
7:27Sige nga. Recitation.
7:29Papaano yung movement ng decimal point?
7:31Is it to the left or to the right?
7:35Oh, paganito ba sa left o papunta ng
7:40right?
7:43Mm. Pag positive.
7:50Sige. Si ano si
7:52ah Richarles
7:54ah sir ah to the right sir kapag
7:58positive to the right no? Okay. Ayun. So
8:02correct no. So kumbaga pag positive po
8:06dapat papunta dito. Teka baguhin ko yung
8:08kulay
8:10o. To to yung decimal point mo. Pa-right
8:13'di ba? Paganito yan. gumagawa tayo ng
8:15ganitong parang ano ah
8:18pagsusulat no to calculate kung ilang
8:21zeros na yung nilalagay natin. Okay?
8:25So kung pa-right ang ah positive so
8:27obviously yung negative is papunta naman
8:29sa left papaliit naman yung value no? So
8:34you would notice na kapag pa-right
8:37lumalaki 'yung value. P'ag pa-left
8:40lumiliit 'yung value. No'no. Ayan.
8:45Then um ano pa ba nakalagay diyan?
8:48Exponent signs indicate which direction
8:51the decimal was moved. No ayun.
8:57Okay.
8:59Ayan.
9:03Okay. Ayan na. So
9:06ah how do we write no this? Okay. In
9:10scientific notation. So you would notice
9:13no ah ito yung small yung value maliit
9:16'to no 0.004 004
9:1923
9:21So we copy
9:23no 423 place a decimal point here okay
9:28since uh nandito yung decimal point 1 2
9:323 4 so four placement from its original
9:37so dapat 10 rais to the 4 no ayan so
9:43minob niya no ayan
9:49Okay. Ayan o. Sige nga. Can you Mabilis
9:52na lang to sa inyo ha? Kasi nag high
9:55school naman kayo eh. Nagstem na kayo.
10:00Sige nga. What is the correct scientific
10:04notation?
10:06Oh, you chat your answer.
10:10Oh, sige nga.
10:16Mmm.
10:19Anong sagot ninyo? May sumagot na ng
10:22letter D. Ang unang sumagot si
10:26uh Gelvic no tumog doon. Okay sige let's
10:33see.
10:35So the correct answer
10:38' ba? Ayun. So the correct answer should
10:41be ah B. Sino nauna nakakuha ng tamang
10:44sagot? Teka. Si Ang nakakuha ng tamang
10:47sagot
10:50si Lesty F. magsino. Ayan. Ito to to.
10:54Ayan. Siya 'yung unang sumagot ng B no.
10:58Ito. Ito dapat.
11:02Okay. Bakit no? Kasi may hindi ah bakit
11:05hindi ah D no? Okay. Ba't hindi ito?
11:09Ayan. Kasi dito malaki yung value niya
11:11eh. Nandito yung decimal point
11:14supposedly.
11:16Ayan dito.
11:18So meron kang ah 1 2 3 4 5. So you copy
11:233.53
11:2710 to the 5th power. No ayan. So ito no.
11:34Ayan.
11:37Okay.
11:39Ayan. So yun yung sa scientific notation
11:44no'. Okay. Now, another
11:48uh apart from measurement we also use no
11:53ah units.
11:55[nililinis ang lalamunan] Units. Okay.
11:59So ano ba example ng units? Okay. Ito
12:02example kilometers.
12:05Okay. Meron pa tayong tinatawag na
12:07kilograms,
12:09liters,
12:11milliliters. Ano pa ba? Um
12:17ah grams no [nililinis ang lalamunan]
12:20and so on no.
12:22Now, um units are also important no to
12:26tell
12:28how many of this and how many of that.
12:32Okay.
12:33Halimbawa class kung bibili kayo sa
12:36isang ano restaurant no? O-order kayo ng
12:39isang bagay.
12:41Pabili nga ng isa. Sabihin niyo ganun.
12:44Pabili ng isa.
12:46Sabihin niyo no? Tatanungin kayo nung
12:48ano nung crew. Ano po 'yung bibilhin
12:51niyong isa? [tawanan] Okay. Hindi basta
12:55bigyan mo ako non yung isa. Isa lang
12:57non. Bigyan mo ako non. Pero hindi mo
12:59ini-specify ano yung isa na binibili mo,
13:01ano. Okay. So ang pangit ' ba? Mahirap
13:04'yun. O sino sa inyo na-try na non?
13:09Wala no? Wala. Okay. So, example dito, 1
13:12cup, three eggs, five molecules. No, so
13:16you're telling ano yung measurement no
13:20ng bagay na yon. Ayun. Ilang ganon.
13:22Okay.
13:25Ayun. Okay. Now, measurement and
13:29estimation. Okay. Paano paano ba
13:32pagkaestimation? Anong anong nangyayari?
13:37O, pag-estimate lang. Anong ibig
13:39sabihin?
13:41Ah chat niyo na lang class.
13:44Mabilisang sagot lang. Ano ba ibig
13:46sabihin ng estimation?
13:58Okay. Pag estimation syempre hindi yan
14:02exact.
14:07Hindi siya exact pero no as much as
14:11possible we try to make it close.
14:15Okay? Malapit po sa exact value or
14:18amount nakalagay diyan.
14:20As much as possible, we want to make it
14:23closer to the correct value
14:28okay
14:31there's what we call uncertainty
14:35exist now on the last digit of the
14:38measurement because of this portion of
14:41numeric value is estimated.
14:44Okay. So,
14:48okay.
14:50Ayan. So saan daw nilalagay usually yung
14:53estimates last digits of measurement no?
15:00Okay. For example class dito no ayan
15:04ito.
15:07Okay. Ang sinasabi dito
15:10two digits are certain
15:14digits would not change in the reading
15:17made by one person to another. Okay.
15:20However, yung last digit dito no, yung
15:22kino-consider natin yung 2, no. Um, this
15:28can be an estimate no? Kasi dun sa
15:31measurement tool na ginamit natin, wala
15:35namang graduation. Ano ba ibig sabihin
15:37ng graduation? Walang numeric na
15:39nakasulat banda rito, 'di ba? So that
15:43would uh appear as an estimate.
15:48Okay? Numeric values obtained from
15:50measurement are never exact value. Okay?
15:56Ayan.
15:59Okay. Uh some degrees of uncertainty
16:03exist in all measurement. Tama ba?
16:09Agag ba nagsusukat tayo? Lahat ba ng
16:12sinusukat natin 100%
16:15accurate?
16:17Yes or no?
16:22Hindi lahat no. Plus wala talagang
16:25perfect
16:27measurement.
16:31Okay. So lahat error. For example class,
16:36ah kahit subukan niyo sa ano sa pera for
16:39example ah lahat kayo magdala ng Php20.
16:43Teka may Php20 pa ba na paper na ano na
16:46bill? Teka teka teka. Parang barya na
16:49'no? Okay. Halimbawa lahat kayo may
16:51Php50 na bill.
16:56Then you measure
17:01measure the length.
17:03Okay? So halimbawa ito 'yung pera no'.
17:06Ayan. Susukatin ninyo ito. Ito banda no.
17:09Yan.
17:11Then you tell kung pare-pareho kayo, no?
17:14So I bet hindi kayo pare-pareho ' ba.
17:17Merong mas mahaba, merong mas maikli no.
17:22nangyayari yun no okay no kasi yung uh
17:26manufacturing or yung pag-print ng pera
17:32though it runs in the same machine
17:36okay kahit yung machine nagkakaroon ng
17:38error kahit yung tao nagkakaroon din ng
17:41error sa pagsukat okay so there is no no
17:47100%
17:50accurate
17:51measurement that's why we have to
17:54consider no uncertainty
17:58okay by convention a measurement
18:02typically includes all certain digit
18:06plus one digit that is an estimate.
18:10Because of this level of uncertainty,
18:13any measurement is expressed by a
18:15limited number of digits.
18:19Okay, these digits are called na
18:22significant
18:23figures. Okay.
18:27Ayan. So, let's proceed with
18:31Okay. Uncertainty. Ayan. Okay, class.
18:34Ayan na po.
18:38So, okay.
18:41A recorded as 22 no
18:46Celsus.
18:47Okay.
18:49Three significant figures with
18:51uncertainty in the last digit. So alin
18:53ba yung certain numbers dito sa 22.0?
18:58So yung ah certain numbers ito
19:03yung uncertain itong itong z0 dito banda
19:08ha. Ayan.
19:11So what if no? Yyung measurement naman
19:13natin is 22.11° 11 cel.
19:19Okay, we have four significant figures.
19:22Okay,
19:25yung certain natin dito.
19:28Okay, it
19:31ayan.
19:33So, 13 yung 22. Yung 11 dito these are
19:38uncertain, no?
19:44Yan.
19:46Okay. Significant figures. Because all
19:49measurements involve uncertainty, we
19:51must be careful to use correct number of
19:54significant figures. No in calculation.
19:57Okay.
19:59Ito yung mga rules class. How do we
20:02classify if it is significant figures,
20:06significant figure or not?
20:09Ayan.
20:10So rule number one class
20:15all nonzero
20:19digits are significant. Okay? So basta
20:23hindi siya zero, counted siya as
20:26significant.
20:29Okay. Some numbers have infinite number
20:34of significant figures. Okay. Bakit daw
20:37infinite?
20:39Okay. Kasi wala tayong plinis na decimal
20:42point, no? So 12 in
20:47are always in 1 foot.
20:50Okay? So exact numbers have no
20:53uncertainty.
20:55Yan. So pag mga ganito ano,
20:58infinite number of significant figures,
21:02zeros are significant
21:05when, kailan? Okay.
21:10Ah, ito yung ruling. A if they are in
21:14between, ano ibig sabihin na in between?
21:16Nasa gitna.
21:19Okay. For example class 1
21:230 1
21:27I bang zero na nandito significant.
21:31Okay. According to this law no anong
21:33anong sagot niyo? In between ba? Okay.
21:37So yes.
21:38Okay. Yes po. This one is significant
21:41kasi in between eh nasa gitna.
21:44Okay.
21:46Tandaan ha.
21:49B
21:50at the end of a number after a decimal
21:54point. Okay, teka. Halimbawa, naglagay
21:58ako ng decimal point dito tapos naglagay
22:00pa ako ng dalawa pang zero dito. Yan.
22:04Are they significant?
22:08Okay. Ayan.
22:13So ganun din no? Significant pa rin to.
22:16Ito kasi nagsimula tayo sa ano eh itong
22:20value kasi na to this one is non
22:25zero. So may worth siya itong bagay na
22:28to. So therefore
22:31this would be significant.
22:34significant eh class paano kung ganito
22:36kung baliktarin ko ano
22:390
22:421 okay ito ba ay significant
22:48yan
22:51so hindi na siya significant no kasi
22:54yung numberag
22:57bago yung decimal point is zer No.
23:04Ayan
23:06o. Ito 'yung mga rules class ha. Ito
23:08'yung mga rules.
23:10Okay.
23:13Other rules.
23:16Zeros are not significant to when. Okay.
23:20When kailan? Ayan. They appear before
23:26first. Okay. Nonzero digit.
23:30Okay. Bago daw magkaroon ng nonzero sa
23:32unahan, may mga zero na. So ibig sabihin
23:36hindi sila significant to. Ayan.
23:41They appear at the end of a number
23:45without a decimal point. Ayan. Example
23:48ito no. Itong zero dito yan that's non
23:52significant. Bakit? Kasi wala ka namang
23:55plin sa decimal point no? Ayun.
24:01Okay. When in doubt if zeros are
24:05significant, use scientific notation.
24:09Okay? Bakit? Kasi kapagka yung zero ay
24:12significant, ilalagay mo siya dun sa
24:15scientific notation. Tingnan niyo to ba?
24:186920 pag kinonvert sa scientific
24:20notation
24:226.92
24:2510. Ka ilan ba 'yan? Tatlo. No?
24:28Okay. To the three. Ayan. Mapapansin
24:31niyo 'yung supposedly 'yung nanditong
24:34zero. Teka lalagyan ko ha.
24:38supposedly yung nanditong zero tinanggal
24:41natin ba
24:44okay bakit siya tinanggal kasi siya ay
24:47hindi naman significant gets so ibig
24:51sabihin pala if you want to see
24:55if those numbers are significant or not
24:59you can use scientific notation you can
25:02convert them okay
25:05ayan Sige. Hay naku, naano ko. Sige.
25:09Yan. Okay. Let's practice. 3.2 in. So
25:13you have two significant figures.
25:16What about this one? How many
25:17significant figures? Sige nga sa chat.
25:22Okay. Three. Teka teka. Sinong una
25:23nag-chat? Si Miss O na to to. Francesca
25:27Joy. Ayan.
25:30Cato. Okay.
25:33So that's three. What about this one?
25:36How many significant figures?
25:39Hala, nag-flood na. [tawanan] Okay.
25:42Ito na to. Sige. Ayan. So sige.
25:46So infinite number of significant
25:50figures. Bakit? Bakit daw infinite plus?
25:53May nakita ka bang decimal point?
25:58Okay. Wala kasing decimal point no?
26:00Wala. Ayan. Kaya clinascify siya as
26:04infinite
26:06no? Ayan.
26:12Okay. Ayan po.
26:160.003
26:19km. O ilan?
26:22Ayun yung una nag-chat ng one. Ayan
26:25correct. Ayan.
26:28So bakit one lang no? Kasi yung mga zero
26:32na nandito
26:34nasa unahan hindi counted kasi yung zero
26:37mo bago yung decimal point. May zero ka
26:40bago yung decimal point no. So ang
26:42counted lang dito is yung three no. Yun
26:45lang.
26:47O significant figure. Okay?
26:51Ayan. So tapos na. No, ganun lang po
26:53iyung significant figures, no?
26:56May questions so far? May tanong po ba?
26:59Clarifications?
27:18May clarification po. Wala. Okay. Sige.
27:21Let's proceed po sir. Okay. Okay.
27:25Rounding of numbers. Kailan tayo
27:27nagra-round off, no?
27:30Okay. Whenever no? Kapagka halimbawa may
27:33mga 5 no,
27:36we can do round off ba? Okay. Do sa last
27:40digit.
27:43Okay. Ayan. So sige nga.
27:47Okay. For example class uh 53.2305.
27:55Ayan ah we want to round off dun sa 2.
28:00Okay eh yung kasunod nung 2 is 305.
28:05Okay, that's uh
28:08what less than no 5.
28:12So anong gagawin natin class? Retain or
28:16plus one.
28:18So ang ginawa natin is ano, sige nga. O
28:22retain lang. Retain yung value no. Hindi
28:25mo hindi mo hindi mo tataasan ng isa 'to
28:28'yung number two, ayan.
28:31Okay. What if higher or greater than
28:355? Ayan na. So ang gagawin natin yung
28:39digit yung seven yung seven dito. Teka
28:44gagawin nating 8. So dadagdagan ng isa.
28:48So we will make it 11.8.
28:54Ayun.
28:57Practice practice
29:03um okay round of the following number to
29:06the given number of significant figures.
29:09O you make this significant figures
29:13what's your answer?
29:17Ha? Teka four daw. Four?
29:21Hindi 79.1 ang sagot do o.
29:25Sino una na? Ito ito si Ace
29:29Nathaniel. Ito siya yung unang nag-chat.
29:31Ayan. So pag gagawin nating four
29:33significant figures to this should be 79
29:3914 kasi yan yung four
29:42significant figures. No tatanggalin mo
29:44ong
29:457 dito no? Gagamitin mo siya for
29:48rounding off.
29:50Okay? So yan tama. 79.
29:5514 ang sagot no'no. Yan.
30:00Alr.
30:01Sige.
30:04O, next tayo.
30:06What about this one? Three decimal. Ay,
30:09three decimal. Three significant
30:11figures. Oh, alin diyan 'yung pangatlong
30:14significant figures?
30:16Oh, nasaan? Nasaan?
30:19Hindi ' ba? 'Yung mga zero sa unahan ng
30:25zero na decimal, ito. Ito at saka ito.
30:30Not significant sila.
30:33Ayan.
30:34Asan yung significant pa diyan? Ayun.
30:36Ayun, nakita ko na yung tamang sagot.
30:38Ayan na. Nakita ko na.
30:40Si Miss Siemarie. Ayan. Oo.
30:46Ayan. Bakit tama si Temary? Ayan. Yan.
30:50Kasi nga NS nga to eh. Non sig. So ang
30:53count mo ng significant is dapat ito.
30:56Ito na agad
30:59yan. So kung tatlo yan dito ka mag-ano.
31:02Dito ka maground off no. Yan. Tingnan
31:05nga natin kung tama tayo.
31:08Ayan. Yan. Okay. So, tama ba si Miss ano
31:11si Ayan si Temarie? Ayan tama siya no?
31:15Ayan.
31:18Okay. Ayun. Gets ba? Na-gets niyo kung
31:21bakit yung reason? No, tandaan niyo
31:24class ha. Baka ma-technical kayo sa exam
31:26ha. Basta pag zero ito tapos may decimal
31:30point 'yung kasunod pang zero non
31:33ah non significant.
31:35Okay. So kailan ka magkakaroon ng
31:38significant numbers do dun sa nonzero na
31:41kasunod no kung meron.
31:45Okay.
31:47Ayan o. Ito na. Ito na. O. Three
31:49significant figures.
31:52Ayan.
31:55O. Anong sagot niyo? Sige nga. Ayun.
31:58Okay. Okay. Teka. Sino unang naka-type?
32:01O mukhang ito yung tama. Si ano Jillian.
32:04Ayan. merkado. Ayan. Sige. O, next
32:07natin. O, tama. 136. Tatlo lang eh. No
32:12yan o. Ito decimal places. Ay, two
32:15decimal. Two significant figures. Sorry.
32:20Sinong nakauna dito? Ayun. Okay.
32:24Si Chelvik.
32:27Yan. Tumogdon. Ayan.
32:31Okay. Oh, ayan na pala eh. Okay na pala
32:32tayo sa rounding off eh. Okay class. Ah
32:35may tanong pa ba sa rounding off? Okay
32:38tayo sa significant figures ha and
32:41rounding off. Okay.
32:47Okay. Now, class uh what if no what if
32:52uh we involve
32:54significant figures in calculation?
32:57Okay. What if uh gagawa tayo ng
32:59multiplication or division? How would
33:02you utilize it?
33:05Papaano? Okay.
33:09Ang sabi dito, if you're going to use it
33:12in multiplication or division, tandaan
33:15to ha.
33:17Significant figures of the answer are
33:20based on the measurement
33:23with the least number of significant
33:26figures. Teka, anong ibig sabihin ng
33:29list? Pinakamarami, pinakakunti.
33:35O, pinakaunti.
33:38pinakakaunti ' ba? Okay. Oh ito. Ilang
33:41significant figures ba meron dito? Yan.
33:44So dito meron kang three.
33:48Ah dito dito meron. Ilan meron ka? Dito
33:51meron kang two.
33:54Napansin? Okay. Pero ito yung sagot mo.
33:58Ito yung lumabas sa operation mo.
34:01So ibig sabihin kung ang susundin mo ay
34:04two significant figures lang.
34:08Okay. The final answer should be written
34:12in 87.
34:14To no? Ito lang
34:17yan. Okay.
34:19Gets?
34:21Kailan mo gagawin to? Yung pinaka-list
34:24kapagka multiplication or
34:28division, no?
34:32Okay. Pinaka-least daw. Okay.
34:38O ayan example. O sige. Yan game.
34:43Teka
34:46yan. Ano ang pinakamababa nating
34:48significant figure? O dito.
34:52Sige nga try muna natin. Ilang ilang
34:53significant figure dito? Dito. Ilan?
34:57Ah ilan? Correct. Ayan. Teka. Sino ang
35:01unang nagsabi? Nag-chat? Si Chloe. Ayan.
35:06Hubag. Ayan followed by ano sabay sila
35:09eh. Francesca Joy. Ayan o. Count ko na
35:13rin to. Si ano si Miss ah Sopia. Ayan
35:16sheitum. Ayan. Okay. So you have four
35:20yan oh. Dito. Ilan? Dito.
35:25Okay. Ang una nag-chat. Teka iba naman.
35:28Ito si ano ngayon pala nagano 'to.
35:30Mutya. Ayan
35:33ang count ko na rin 'to. Ito si
35:37corres. Ayan two yan. What about this
35:39one? Ilan 'to? Take note ha. Walang
35:42decimal point to. Okay so this can be
35:44classified as infinity no? Therefore,
35:49since infinity to ah ang ire-recognize
35:54natin dapat kasi multiplication and
35:57division naman to. Ito dapat no. Ayan.
36:00Two.
36:05Okay. So gets. O sige. So anong final
36:08answer natin? Sige. Anong final answer
36:11po natin?
36:13[tawanan]
36:14[sumisinghap] Ayan. Okay. O ito count
36:17natin 'to. Kuha na ako ng tatlo.
36:20Ayan.
36:22So na-count natin Cato, Magsino
36:27at saka si Remonde. Ayan. So kung two
36:31significant figures, ang sagot dapat
36:34natin ay A. No? Then
36:38since dito yung kasunod niya is 72, we
36:43should round it off. 'Di ba? So dapat
36:45nira-round off natin, no? Ayan. So,
36:50okay. A is the correct answer, no? Yan.
36:59Okay.
37:01What if? O na. What if?
37:06Ah, hindi na hindi na ano, hindi na
37:09multiplication and division, addition
37:12and subtraction na yung ano natin ah
37:14ginagawa. Okay.
37:17So ang sabi dito no, significant figures
37:22of the answer
37:28are based on the precision
37:31of the least precise
37:34measurement. Ano ba ibig sabihin ng
37:37least precise measurement? Okay.
37:41Are only as precise as the least no
37:44precise measurement. So pinaka precise.
37:49Okay. Sige.
37:53Okay. The least precise number is 79.
37:57Okay. Pinakunti yung um
38:01decimal point I mean decimal places.
38:07Okay. So mapapansin niyo ah ilan ba yung
38:10decimal place
38:12nito? Yan. So you have two. Ito naman
38:18wala. Ito
38:21isa.
38:24So ang susundin natin dito is
38:28yung pinaka-least no ang decimal
38:32placement kasi ang precision no
38:35pumappertain doun sa decimal place.
38:38Ayan. So yung 79 natin wala kasi. So the
38:42final answer should be
38:44247.
38:46Okay. Ito dito dito ka mag-ano. Ito
38:50gagamitin mo na to for rounding off
38:52itong part na 'to. Okay.
38:57Ayan.
39:01Practice practice. Alin dito ang ah
39:03least precise sa dalawang to? Alin?
39:07Alin?
39:11So syempre ang least precise natin ay
39:13'yung 13.0 zero kasi dalawa yung nandito
39:16eh. So
39:18ah sige what's your final answer for
39:22this?
39:24142.57
39:26- 13
39:32mm
39:38teka teka. Sorry nag-log ako. [tawanan]
39:41Ayan na.
39:43Ano na? Ah bakit sila nag 13.0?
39:49Parang hindi yata pwede yun ha. Okay.
39:51Anong final? Ay teka ano pala.
39:55Wait lang wait lang. Nag-log ako. Sorry.
39:58Ang unang nakakuha ng tamang sagot.
40:00Okay. I think it
40:02ordonya. Ayan.
40:05Okay. So the answer is B.
40:08Ayan.
40:10Okay.
40:12Ayan. Sorry class, nag-ano ako nag ah
40:14freeze yung ano ko ha. May pina-patch
40:17kasi ako eh. Okay. Ayan. So ito po yung
40:20tamang sagot ha.
40:28Ayan.
40:38Okay. So yung ah reasoning niya ito to
40:42yung reasoning niya is the answer is
40:44rounded to 10th place.
40:48Ah ' ba pag nag-aano kasi tayo
40:50nagde-decimal
40:51point tayo ' ba may ones, tens hundreds,
40:56thousands ' ba may ganun tayong
40:58kina-count no. Ayan. So 'yun ung
41:01sinasabi niya no. Doon daw sa pinakauna
41:03yung tents na decimal place doon daw
41:06tayo nag round off no ayan o next ito na
41:12o papaano to class o na
41:15ah meron tayong subtraction sa
41:18numerator.
41:20May subtraction tayo tapos followed by
41:25division.
41:26So dapat susundin natin 'yung ano.
41:30Teka.
41:32[tawanan] Okay. O sige nga. Try natin.
41:34Try try. So papaano muna? Papaano?
41:39Saan muna kayo magsimula ng operation?
41:43O yung nasa taas ba pwede mo na bang
41:44i-divide agad? Hindi pa. No? Ayan. So
41:48kailangan i
41:50ah simplify mo muna yung nasa taas.
41:53Gawin mo muna.
41:56Subtract first. Okay. Unahin muna yung
41:59subtraction.
42:03Pero may ba may sinusunod tayong ano
42:05yung tinatawag nating MD das?
42:10Paano yun? ' Ba may m tayo yung
42:12multiplication, division, addition and
42:17subtraction.
42:19Tapos ang turo
42:21no ah you multiply and divide first.
42:25before you add and subtract ba
42:31hindi ba against the rules yun?
42:34Hindi hindi hindi ano hindi okay bakit?
42:38Okay sige let's make this clearer no?
42:40Lalagyan ko siya ng
42:43yon
42:45ayun nilagyan ko na ng open and close.
42:51Okay.
42:53Ayan na. Nilagayan ko na ng opening and
42:54closing. Ayan. So inano ko na siya. Yan.
43:01Okay. O sige nga. Anong sagot niyo doun?
43:03Sa taas. Dito muna. Sa taas muna. Sa
43:06numerator muna.
43:10Ah may ay may final answer na kayo. Sige
43:12sige yung final answer na lang. Sige po.
43:15Oo to to.
43:17Ang unang nakasagot ng final answer,
43:19Samantha Riego.
43:23Okay, sige try natin. B daw ang sagot
43:26niya.
43:28Ah teka. Okay.
43:35Okay. Ang tamang sagot, teka teka class
43:37na ganon ako. Ayan. So ang tamang sagot
43:40daw ay D. Tama ba 'yung sagot niya?
43:45Hindi. Okay. Sino nakakuha ng unang
43:47letter D? Ayan, ang unang nakakuha ng
43:51letter D si Richarles. No.
43:55Ayan.
43:57Okay. Ayun po. Yun yung tamang sagot. Ah
44:00bakit yun yung tamang sagot? Teka.
44:07Okay. Ang ginawa niya class ganito no.
44:12Sinubtract niya muna to.
44:16Okay? Since yung least precise natin is
44:19ito no? Ito yung least precise.
44:22Ayan. So two significant
44:25figures. And your final answer is
44:30ito 6.98 98
44:34para don sa subtraction ha. Ito 'yun.
44:36That will be translated to 7.0
44:42divided by 10.1 since dito kasi
44:47ah 2
44:51significant no? Ayan. Tama ba? Numerator
44:57is then rounded to 10th place divided by
45:04Okay.
45:07Okay. So yun yung nakuha niya. Ito.
45:10Ayan. Okay.
45:15Ayun. So ang final answer nating class
45:17is 0.69 ha.
45:24Ayan. Okay. Uh counting significant
45:27figures.
45:29Okay. How many significant figures
45:30should the answer uh to the following
45:33calculation contain?
45:36O ilang significant figures daw dapat?
45:40Teka, ang sabi kasi dito list eh.
45:45Okay. So ang may
45:48Okay. Addition and subtraction to. So
45:50ang pinaka-last natin dito ah in terms
45:53of precision ito.
46:01Mmm.
46:04Kaso ang problema hindi ba ma-calculate
46:06to as infinity. O sige nga, may sagot ba
46:09kayo? Teka sa mag-ano muna ako.
46:12Magta-type muna ako ng ano nito. O sige
46:14sagot kayo class. Yan na
46:19'yung iba. Ang sagot ay B.
46:22Okay. B. O sige B. Sinong unang nag-B?
46:26Si ano ulit ah Miss Francesca
46:30count ko na rin 'to. Rego
46:33Shitum. Okay. Sige.
46:36So two no. Okay. Kasi kung infinity ang
46:41considering dito, okay? Ah saan kayo
46:45pwedeng humugot ng sagot? Ito naman ano
46:48ah bakit hindi ito? Okay kasi masyadong
46:51malaki. Ayan. Masyado na siyang ano yan.
46:55Okay.
46:59Ayan o. Tama. Yun nga. Uh two 'yung
47:03final answer natin. Okay.
47:10Round to at least to least precise
47:13number. 23 daw 'yung pinakaast.
47:18Okay. Ayan. So sige ah let's go to
47:23metric system.
47:25Ayan. So let's go to metric system.
47:29So uh most of you have already
47:33encountered
47:35metric system or the SI na international
47:39system.
47:41Okay. If you want to measure length or
47:44haba, no, we use meter. If you want to
47:49measure mass or
47:51amount of material, no, we use kilograms
47:55or grams.
47:57Temperature, we have Kelvin.
47:59Then yung Kelvin can be converted to
48:01Celsius
48:03and Fahenheit. Sa time naman we use
48:06seconds
48:09but we also have minutes and hours.
48:14Aunt of substance we use mole.
48:17Ayan. And then electricity or electric
48:20current amperes.
48:23Ayan.
48:26Okay. Now,
48:30ito yung abbreviation nila. Ayan.
48:34So normally when we are calculating no
48:38hindi naman natin sinasulat yung buong
48:39unit name no hindi yung buong ito.
48:44Okay? What we're writing is it
48:47abbreviations.
48:53Ayan.
48:54So
48:56o siya.
48:58Ayan. So yung si
49:02can be added with prefix. Ayan ito to
49:07prefix.
49:08Okay. For example no
49:11kilo no. So
49:16ah it represents a000 no pag kilo for
49:20example
49:231 m. Paano kung halimbawa 1,000
49:29meters?
49:30Okay. This can be writtenen in 1
49:35kilometer. Tama ba? Ayan. Halimbawa
49:39naman 1 gr meron kang 1,000 gr.
49:45This can be written in 1 kg.
49:49Okay?
49:53Ayun. Then uh we have mega no
49:58okay 1 million and then giga no 1
50:03billion
50:05ayan okay
50:10paano kung mas maliit no so we have de
50:13and cy and then meron tayong tinatawag
50:17pang mili
50:20tapos meron pang
50:22micro Pro and then nano. Okay. So mas
50:28maliit pa no. Ayan.
50:35Ayan. Ito yung mas maliit class.
50:39Mili, micro, nano, pico, pemto, no?
50:47Okay. Measurement of length. We use
50:50meter, no? Ayan.
50:54So
50:55the distance light travels in vacuum no
51:01one overan yung seconds no okay
51:09common length relationship ayan 1 m is
51:12100 cm
51:15ah 1 m is also equal to 1000 mm no then
51:211 km is 1,000 m
51:25relationship ah between metric and
51:28English. So bukod sa metric or
51:30international may tinatawag din po
51:33tayong English
51:35system no? So doon papasok to yan inch
51:40yan. So 1 inch is equivalent no to 2.54
51:46centimeter no.
51:48an
51:50so plus do we still do we still use no
51:54uh English system in our society
52:01do we still use English system
52:05meron pa rin ba meron ooan
52:11example clas o sino sino sa inyo yung
52:14ano gumagamit ng
52:18system sa height
52:21ag ano bang height niyo sige nga pag
52:23tinanong kayo anong height niyo ano ba
52:25yung sinasabi niyo
52:28' ba
52:30' ba normally ang binibigkas ninyo is ah
52:35okay footend inches 'di ba ayan
52:41pero pwede rin ba ang height ma-measure
52:44sa
52:45meters
52:47or centimeter. Meron din bang ano? Meron
52:50din bang mga tao alam nila yung height
52:52nila based on cm centimeter? Meron din
52:56ba? Meron. Okay. Now, if you were ask
53:00alin ba mas accurate yung foot and uh
53:06inch, tama ba? Foot and inch and or
53:11centimeter no? Alin ang mas
53:15accurate kaya?
53:18Okay.
53:21So, so okay, it's a debate ano. Okay.
53:26Kung standardize naman pareho iyung tool
53:28that they use, no, one can be converted
53:32from the other, no? It's the same kasi '
53:37ba iyung foot and inch can be converted
53:40to centimeter. Centimeter can be
53:42converted to foot and inches.
53:47No, we can do that. May conversion
53:48factor tayo no.
53:51Ayan.
53:53Sige.
53:55Now, let's go to dimensional analysis.
53:57To malapit na tayong matapos.
54:00Converts one unit of measurement to
54:03another by using conversion
54:06factor. Ayan.
54:10Ah. Ayan. So, ano ba yung conversion
54:12factor? So, ito yung mga conversion
54:14factor. Ayan.
54:17Plus ito no kasi meron tayong ano meron
54:21tayong tinatawag na conversion factor.
54:24For example ito
54:26yung 1 km is equ to 1000 m.
54:31So ito daw
54:34ito no pwede daw siyang isulat na
54:36ganito. Ayan pwedeng yung kilometer yung
54:41numerator,
54:43yung meter yung denominator. So pwede
54:45ring baliktad no?
54:48Yung meter yung numerator, yung
54:51kilometer yung denominator. So pwedeng
54:54baliktad no. Ayan.
54:57So yung conversion factor natin uh can
54:59be written inverse no. Pwede sila mag
55:03ayan ganyan. Okay.
55:10Okay. So for example class,
55:14you have a meter no 2 meters.
55:18You want to convert it to kilometer, no?
55:22So ang ginamit nating conversion factor,
55:26okay, ito.
55:31Ayan, ito yung ginamit nating conversion
55:33factor. So, zero ah using this, okay,
55:38yung meters dito will be cancelled.
55:41Teka.
55:47Okay.
55:50Yung meters dito.
55:54Okay. Can be cancelled. Ito canceled. So
55:56ang maiiwan na unit
55:59we only have kilometer
56:02no as unit.
56:05Yan. So 2/ 1000 you would have 0.002.
56:11Then yung unit natin na naiwan ito no.
56:14KM. Okay.
56:21Ayan.
56:23Okay.
56:26Plus may tanong ako.
56:29What if
56:31yung unit natin na nandito no hindi
56:34meters? What if
56:37kilometer?
56:39How would you write your conversion
56:41factor?
56:43Papaano mo siya gagawin kung kilometer
56:46yung given natin?
56:49How would you write your conversion
56:51factor?
57:03Okay. So it would be 1,000
57:07m / 1 km. No? Okay.
57:15So ito yung tamang sagot. Ayan.
57:18Okay. Bakit? Bakit mo siya binaliktad?
57:20Kasi yung given mo is KM na, no?
57:24And for you to cancel the given unit
57:27which is kilometer, dapat ang nasa
57:30ilalim is kilometer din. Gets ba?
57:34Okay.
57:40Okay. Solution map. Uh when converting
57:43things you can uh make what we call a
57:47solution map. Ayan.
57:50Okay.
57:53Many chemical principles or problems are
57:56illustrated mathematically. So sa
57:59chemistry class hindi kayo makakaiwas sa
58:01math.
58:06Ah math is always part of chemistry.
58:11Okay. And lahat naman ng science may mat
58:15no. Okay.
58:19So our approach is the dimensional
58:22analysis method. Okay.
58:26Ayan. Okay. Let's say we want to convert
58:30centimeter to meters. Ayan. So yung
58:33conversion factor natin dito is
58:38uh for every 1 meter you should have 100
58:43cm. Yan. Mapansin niyo yun yung ginamit
58:48dito oh.
58:52Ayan. Okay.
58:57So ayan na. Na-cancel natin iyung cm na
59:00unit and we were left with meters.
59:04Napansin?
59:06So this is what we call dimensional
59:09analysis, no? Ayan.
59:19Okay. Ayan. So same with ano ha, same
59:22with the uh example below yung 125
59:26meters to kilometers.
59:28Ayan
59:30o. Sige nga. Ito ito to tayo ito.
59:34Ah how many
59:38how many uh microm micrometers are in
59:430.03
59:46meters? O try nga. Try.
59:52Oh what's your answer? Okay. Letter A.
59:54Sige.
59:57Okay. So, the answer is A.
59:59Ayan.
1:00:01Bakit no'? Kasi 'yung micro daw is for
1:00:05every 1 meter daw, ang
1:00:08equivalent daw n is 1 million
1:00:11micrometers. No? Ayan.
1:00:17Teka, hindi ko nabigyan ng points yung
1:00:18ano ah. na nag-recite o
1:00:23Altea. Ayan yung nag-recite Altea.
1:00:32Okay. Now, uh we can also do series of
1:00:36conversion example class days to hours
1:00:39to minutes and seconds.
1:00:44Ayan.
1:00:52Okay.
1:00:55Pwede rin bang ma-convert yung metric to
1:00:57English? Ah yes, pwede rin no? Yan yung
1:00:59sinasabi natin kanina.
1:01:02Okay.
1:01:06Ayan. How many feet are there in 250
1:01:11cm? So ang sabi natin,
1:01:14okay, ito yung unang conversion factor,
1:01:16no? Yung cm kinonvert sa inch.
1:01:20Then afterwards, yung inch kinonvert sa
1:01:24foot, no? Kasi for every 1 foot, there's
1:01:2712 in ba? So ang final answer is
1:01:34okay, 0.20 ah 8.20. 20 sorry 8.20 20.
1:01:40Ayan.
1:01:48Okay. Ayan. How many meters in
1:01:525 yards? Okay. Ayan.
1:01:56Familiar ba kayo sa conversion factor
1:01:59ng meters to yards? Familyar?
1:02:04Sige kung hindi teka move din natin to.
1:02:08Okay ayan po.
1:02:11Medyo mahaba-haba kasi siya. Ayan. So
1:02:14from yards
1:02:16you convert it to feet. Kasi ang sabi
1:02:19for every one yard that's 3 feet.
1:02:26Okay. Then for every fit,
1:02:31okay, that's 12 in. Then [sumisingasing]
1:02:33for every inches,
1:02:36that's 2.54 cm, no? Then pag nasa cm ka
1:02:41na, you convert it to meters. And you
1:02:43have
1:02:454.57
1:02:48meters, no? Yan.
1:02:56Okay. What about this one? No, how many
1:03:00cm cubes?
1:03:02So, ang pwede mong gawin is you multiply
1:03:05this first,
1:03:07no?
1:03:09Okay. So, you would get 52.8 8
1:03:13inch no cube.
1:03:16Okay. Then convert this using
1:03:21okay 2.54 cm over 1 in. Then notice na
1:03:25nakaano siya ha naka cube.
1:03:28So ibig sabihin three times no? Ayan.
1:03:34Alternatively ito mismo itong mga to
1:03:37pwede mo na siyang i-multiply sa
1:03:39conversion factor
1:03:41yung mga inches mo. Okay? And then you
1:03:44multiply them no? You would land on the
1:03:47same answer. No?
1:03:52Ayan.
1:04:02Ayan. Okay. Ah measurement of mass. Ano
1:04:07ba yung measurement ng mass? Mass is the
1:04:10amount of matter
1:04:14in an object.
1:04:16While weight, ito yung pinagkaiba ng
1:04:19mass at saka weight ha. Okay. Is the
1:04:22effect of gravity
1:04:26on an object.
1:04:29Okay. So magkaiba pala ang mass and
1:04:32weight.
1:04:33Mass is the amount of matter.
1:04:36Weight is the with the effect with the
1:04:39effect of gravity.
1:04:42So ibig sabihin teka. Saan ba
1:04:44nanggagaling ang gravity natin? Class,
1:04:50teka lang. Saan nanggagaling ang
1:04:52gravity? Sige nga.
1:04:55O, yung makapag-chat ng tamang sagot. Oh
1:05:11sa mass
1:05:16gravitational force.
1:05:21Okay. Okay. Sige sige. Ito na to medyo
1:05:23medyo okay to ha.
1:05:25Okay
1:05:28sa universe. [tawanan]
1:05:30[sumisinghap] Okay. Ganito ah. If
1:05:32there's something
1:05:34too massive no in our in the space,
1:05:40okay? Particularly yung planeta natin,
1:05:43no? It creates gravity,
1:05:46no? They they pull materials in their
1:05:50surroundings, no? Ayun.
1:05:53kasi may bending ng space dahil
1:05:56masyadong mabigat yung isang bagay.
1:05:58Okay.
1:05:59Now, okay.
1:06:03Kaya may gravity. Now, ah bawat planet
1:06:06no yung planeta for example yung Earth
1:06:09no. Ano bang gravity ng Earth? 9.81
1:06:15m per second s no? Alam ko ito yung
1:06:18gravity ng Earth ha. Okay. Now,
1:06:22iba yung gravity sa Earth, iba rin yung
1:06:25gravity sa moon.
1:06:28Moon natin yung sa atin. Then iba rin
1:06:30yung gravity sa Mars, no? So, ibig
1:06:34sabihin sa kanila no, I think it's less
1:06:38than 9.81.
1:06:41Okay. So if you go to moon ' ba
1:06:44halimbawa
1:06:46100 kg ka ganun ka ka
1:06:49bigat no yung timbang mo. Pumunta ka ng
1:06:52Moon hindi mo na kailangan mag-diet
1:06:56no. Mas mababa ka na. Pwedeng siguro
1:06:58nasa ano ka na lang yung timbang mo.
1:07:01Nasa
1:07:0360 kg ka na lang.
1:07:06Okay. So mas magaan ka doun. Ano? Bakit
1:07:08mas magaan ka doun? Kasi yung effect ng
1:07:10gravity no.
1:07:13Ayun.
1:07:16Ah mass is independent of location but
1:07:19weight is not. Yun yung sinasabi no?
1:07:22Kasi yung weight ah pwedeng mabago
1:07:24depende sa gravitational field no.
1:07:28Ayan. Mass is the standard measurement
1:07:32of metric system. Yan na no.
1:07:37Okay.
1:07:40Unit of mass. Ito po. Ayan.
1:07:46O sige. Ayan. Let's practice. So how do
1:07:49we convert grams to kilograms? So sabi
1:07:51natin for every 1000 gr you have 1 kg.
1:07:56Ayan.
1:07:59Okay.
1:08:05Ayan. O. Ito nga. Convert nga natin.
1:08:07Medyo parang repetitive na to.
1:08:11Ayan.
1:08:12How many centigrams are there in
1:08:15kilograms? Cent.
1:08:19So centimeter cent no? Centigrams.
1:08:24O anong sagot niyo class?
1:08:28Teka. Sumagot na ba kayo? Ayan ito may
1:08:30sumasagot na.
1:08:35Okay. Ito B. Ano 'yung iba? Okay. Sige.
1:08:41So the answer is B. No you first convert
1:08:45it to grams then you convert it to
1:08:48centigram. Ayan nandiyan yung solution
1:08:49sa baba ha.
1:08:53Okay. Now next.
1:08:56Okay. Aside from mass we also have
1:08:58volume.
1:09:00Volume is the amount of space. Okay.
1:09:06Occupied by a matter.
1:09:09The SI unit for volume is cubic meter.
1:09:13Noan.
1:09:18Okay.
1:09:20Typically
1:09:23unit more typically used is the liter or
1:09:27milliliter. Ayan. So yung volume class
1:09:30in chemistry class uh liters and
1:09:34milliliters no yung ginagamit natin.
1:09:38Okay?
1:09:401 L
1:09:42no is a cubic deer of water. So equal
1:09:47daw yung 1 kilos ng water is 1 L no at 4
1:09:54celus.
1:10:01Okay.
1:10:03Ayan.
1:10:08Volume can be measured with several
1:10:10laboratory devices.
1:10:13So may iba-iba raw na laboratory tools
1:10:15na pwedeng gamitin. Yan o. Example
1:10:18class. Ito may mga pictures.
1:10:22Graduated cylinder. Ayan. Ah sino sa
1:10:25inyo nakahawak na ng graduated cylinder?
1:10:29Ayan.
1:10:33Okay.
1:10:36Wala pa. Wala nak wala pa nakahawak ng
1:10:38graduated cylinder sa inyo. ' Ba stem
1:10:42students kayo? Ayan. Okay. Meron na. Yan
1:10:44na pala eh.
1:10:47Okay. O ah. What about volumetric flask?
1:10:52Ayan.
1:10:53So meron ng nakakita sa inyo ng
1:10:55volumetric plus. Nakahawak na naka-try.
1:10:57Okay.
1:10:59Buret ito o ginagamit sa ano 'to. Anong
1:11:03experiment ngayong pinaggagamitan ng
1:11:05buret class?
1:11:11Oh
1:11:13yon. Okay. Correct.
1:11:16Yan tama si temie no? Titration
1:11:20' ba
1:11:22ginagamit sa titration yung burets o
1:11:25pipet. Ayan so meron tayong mga pipet.
1:11:28Ito naman pangtransfer no. And then of
1:11:36okay kung uh medical or let's say health
1:11:41allied yung course ninyo, you would be
1:11:44encountering syringe.
1:11:47Okay? Ayan. So meron ding syringe.
1:11:55Okay. Common volume relationship.
1:11:59O ang isang litro daw 1 L is equivalent
1:12:02to 1000 m L. 1000 ml is equivalent to
1:12:081000
1:12:10cm cube.
1:12:12Okay. Ayan.
1:12:17Ayan. Solution map. Ayan.
1:12:20Okay.
1:12:21Conversion tayo. How many millilers are
1:12:26in
1:12:28cube? No. Which size? Measuring 13.1 in.
1:12:38Sige nga. Try nga. Try.
1:12:42Oh ' ba may cube daw tayo. Yan yung cube
1:12:45natin.
1:12:53Ayan. So meron kang ah
1:12:58measurement dito.
1:13:01Dito
1:13:02tapos dito no. Yan.
1:13:06O sige nga. Anong answer ninyo? May
1:13:09calculator ba kayo?
1:13:11Ano ilang ilang cm nga ba ang conversion
1:13:14natin ng inches?
1:13:21Parang nawala yung function ko. Ah sige
1:13:23sige may answer na kayo. Okay. Letter D.
1:13:26Sige try natin. Try para mabilis tayo.
1:13:30Wait lang.
1:13:34Okay D. Okay. 'Yun 'yun 'yung tamang
1:13:36sagot. Okay. Bakit? Ah kasi if you
1:13:39convert the 13.1
1:13:42inch [sumisingasing]
1:13:44ah that would be 33.3 cm.
1:13:48Then ah i-cube mo yun. you would have
1:13:523.69 69 * 10^ 4 no?
1:13:57CM³
1:13:59and of course yung cm³ alam naman natin
1:14:01na yun ay equivalent lang din sa ml sa
1:14:05milliliters no yan.
1:14:12Okay? What about percent? Alam ko naman
1:14:14eh lahat kayo marunong na mag-percent
1:14:15no'no. Okay? So parts over total parts
1:14:20no? Times 100.
1:14:24Okay. Portion divided by total no yan
1:14:28yung percentage.
1:14:30Ayan. Example ito percentage. Ayan 25
1:14:35red flowers div 75 of the total times
1:14:39100 you have 33%.
1:14:48Okay. Uh mass uh percent
1:14:53m [nililinis ang lalamunan] ganun din
1:14:55ano yung portion divided by the wool
1:14:58times 100. Yan o sige nga. Ito nga try
1:15:02natin to. Ayan
1:15:07oh. If there's 14 grams of nickel,
1:15:127.64 means 64 gram of oxygen.
1:15:17Okay. What's the total?
1:15:20O ano daw total? 14.00
1:15:24gr
1:15:267.64
1:15:28gr. What's the total?
1:15:32Sige nga try.
1:15:34So you should have 21. Sino nak? Sino
1:15:37nakaano ng una? Dito muna tayo. Ito to.
1:15:4220. 21.64
1:15:46grams.
1:15:49Tama ba? Now, let's uh see the
1:15:52percentage.
1:15:54O ano ba naging sagot niyo?
1:15:57Ah, ang dami ng sumagot ng
1:16:02Okay.
1:16:03Ito.
1:16:06Letter C ba ang sagot niyo? Sige, try
1:16:08natin. C.
1:16:11Okay no? So ah paano niyo nakuha yung
1:16:15percentage no? Yung ginamit niyong
1:16:17denominator is 21.64.
1:16:22Doon kayo nag-base as total. Tapos yung
1:16:26individual no ito for nickel 14 for
1:16:30oxygen 7.64.
1:16:37Okay.
1:16:42Ayan.
1:16:45Sige. Now, papaano naman pag temperature
1:16:47thermal energy, no? So, thermal energy
1:16:52is a form of energy involving the motion
1:16:56of small particles of matter.
1:17:00So yung maliliit daw na
1:17:05na ano na particle no ng matter
1:17:08gumagalaw no producing energy no thermal
1:17:12energy. Okay now temperature measure of
1:17:17intensity of thermal energy. Okay
1:17:22so how cold or how hot it is. No. And
1:17:27then heat is the flow of energy due to
1:17:30temperature difference. Ayan.
1:17:33So yan daw yung pinagkaiba nila no. So
1:17:35magkakaiba pa pala yun ano yung thermal
1:17:38energy
1:17:40motion nung particles in a matter.
1:17:43Yyung temperature is the intensity of
1:17:46thermal energy. The heat.
1:17:50Okay? Yung flow yung kung saan mas
1:17:52mainit.
1:17:54Okay. Regions. Ayan with higher
1:17:56temperature and lower.
1:17:59SI unit is Kelvin.
1:18:05Ayan.
1:18:07So we have here
1:18:09raising point, boiling point no.
1:18:13So ayan, pwede pala silang isulat in
1:18:16three different
1:18:18measurement or scales, no? So we have
1:18:22Celsius,
1:18:24Fahrenheit
1:18:26and Kelvin. No
1:18:30yan.
1:18:33So Fahrenheit scale has a range of 180°.
1:18:38Okay. Uh between freezing and boiling
1:18:42point.
1:18:43Ayan. Okay.
1:18:49Ayan. Okay. Yung lowest possible
1:18:51temperature daw is Kelvin scale no is
1:18:54absolute zero - 273
1:18:5915 no Kelvin
1:19:02ah sorry degree celsus no. So 0 Kelvin
1:19:06'yung tinutukoy 'no na absolute zero.
1:19:09Okay.
1:19:13Uh these are the mathematical
1:19:16relationships.
1:19:17Okay? If you want to calculate the
1:19:20Kelvin,
1:19:21that's a degree celus
1:19:25+ 273.15.
1:19:28If you want to calculate for Fahenheit,
1:19:32you have you must have the Celsius
1:19:34first.
1:19:35Yan.
1:19:38Okay.
1:19:43Ayan. O sige nga try.
1:19:47O final answer na agad para ano medyo
1:19:50repetitive na kasi to eh. Yung practice
1:19:52practice.
1:19:56Ayan. O sige try tayo. Try.
1:20:03Okay. What's your answer? A. Sige try
1:20:06natin ha.
1:20:08So the answer is A. No si Miss Dolera
1:20:14yung nauna.
1:20:16Okay. Ayan. So ito yung ano ha. Ito yung
1:20:20um formula no.
1:20:26Ayan na. Last topic na tayo. Density.
1:20:29Ayan. So what is density? Density is the
1:20:32ratio of mass of a substance
1:20:36to the volume.
1:20:38Okay? Occupied by that mass or the
1:20:40space, no?
1:20:42Okay.
1:20:44Density is a physical property of a
1:20:47substance. Tandaan ha, physical siya.
1:20:51Okay.
1:20:53Unit for density is mass over volume. No
1:20:59so pwede siyang grams per ml, grams per
1:21:03cm cube or grams per L. No?
1:21:09Okay. Ayan. So example, density of water
1:21:14at 4° celsus is
1:21:171.
1:21:20Ml.
1:21:22Okay? While at 80° celsus, it's97
1:21:28gr per ml. Okay. Ayan. So ito
1:21:33example.
1:21:41Okay. Um,
1:21:44tiganyo class
1:21:47yung gold
1:21:49yung 1 cm no 1 cm
1:21:53cube niya yan or 1 ml niya
1:21:57ay may weight na agad or may
1:22:01mass no na 19.3 gr.
1:22:06Okay. So ibig sabihin
1:22:08maliit yung size niya pero you would
1:22:12feel heavier, mas mabigat.
1:22:16Okay.
1:22:18Ayan.
1:22:20Same goes with sulfur as compared with
1:22:24water. No paano pag sinunod natin yung
1:22:28ano ah halimbawa 10 gr.
1:22:34So ito daw yung 10 grams ng gold.
1:22:36Maliit lang pero yung 10 no
1:22:42grams ng water o malaki ba?
1:22:48Okay.
1:22:51Subukan niyo class. nito
1:22:53um
1:22:561 kilo
1:23:00okay of rice
1:23:06versus
1:23:101 kil
1:23:14of
1:23:16teka teka ko. Nagla-log yung mouse ko.
1:23:21Cotton. Okay.
1:23:25Yan yan. Sinong mas malaki class? Yung 1
1:23:28kilo ng rice or yung 1 kilo ng cotton?
1:23:34Sino mas malaki ang volume?
1:23:37Tingin niyo?
1:23:39Hindi in terms of volume. In terms of
1:23:42volume, sino mas mas wide or mas malaki
1:23:46yung space na ikokonsumo?
1:23:48Okay. So syempre mas malaki yung
1:23:51kinokonsumong ah
1:23:54space ng cotton. Kasi mag-e-expand 'yan
1:23:56eh 'di ba?
1:23:58O pero 'yung rice kasya sa isang plastic
1:24:01lang 'di ba?
1:24:03Ayun. Gets ba? Okay. Yan ung sinasabi
1:24:06dito. Ano yan?
1:24:11Okay. Ayan. So let's practice. Okay. So
1:24:17how to how to get the density? Simple
1:24:20lang class. Simple lang.
1:24:22You must first know the mass and know
1:24:27the volume.
1:24:30How do we get the mass? Normally, how do
1:24:33we get the mass? We use
1:24:35weighing apparatus.
1:24:38Ano ba example ng weighing apparatus?
1:24:42Okay. Balance. Ano ba example? No, meron
1:24:45tayong triple beam,
1:24:47balance, analytical
1:24:50balance. Stop loading
1:24:54balance no? Yung mga yan para ma-measure
1:24:56mo yung ah masyan, pwede kang gumamit
1:24:59niyan. Ah how do you measure
1:25:03volume? Ano ba yung mga apparatus that
1:25:05we can use to measure volume? O pwede
1:25:07kang mag graduated
1:25:10cylinder
1:25:12volumetric flask. Ano pa no'? Ayan. So
1:25:17pwede kang magganyan. Ayan.
1:25:20Okay.
1:25:23And so on.
1:25:26Yan. Okay. So, practice daw. Ayan,
1:25:30density of gold is 19.3.
1:25:34Pwede bang ano? Pwede bang malaman yung
1:25:36timbang ng isang bagay kapagka or yung
1:25:40volume ng isang bagay kapag alam mo ang
1:25:43density?
1:25:44Ayan, ito no? Density. So ang ginawa
1:25:47niya, ang given is 25 gram of gold. It
1:25:53so itong unit na to, itong conversion
1:25:56factor na to,
1:25:59this one is
1:26:03density, no?
1:26:06Yan. Then
1:26:12okay
1:26:18yan density 'to no? Okay
1:26:26sige nga. Ayan. Ayan o. What is the mass
1:26:32of 1.5
1:26:34ml
1:26:35of ethyl alcohol?
1:26:38Ito na. Ito na yung density. Binigay na.
1:26:39Ethyl alcohol.
1:26:53Anong sagot? Ah B.
1:26:57O, i-count ko naman to. Sige, count ko
1:27:00yung kay ano. Okay. Okay.
1:27:03Ito si Miss Ramos. Parang ngayon ko lang
1:27:05nakita yung name niya.
1:27:09Okay. So, the answer is B. Ayan na. So,
1:27:13madali lang ' ba, density, pang-baby
1:27:16lang. Ayan na. Tapos na tayo class.
1:27:21Ah that's all for our uh lecture no
1:27:25today. May questions ba kayo? May
1:27:28clarifications?
1:27:31By the way ha, i mag-u-upload ako ng mga
1:27:34recorded nito ha. Ah para pwede kayong
1:27:37magano mag ah backtrack no. Ayan.
1:27:44So that's the end of our discussion. May
1:27:47questions ba? May questions
1:27:50clarifications or anything?
1:27:53Wala
1:27:55opo. Ibibigay ko. Ibibigay koan
1:27:59yung mga PP. Okay class. Let me stop
1:28:03sharing.

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