Single Displacement Reactions — Transcript

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1. 0:00[Music]
2. 0:08hi dr mamari here by now i'm sure you
3. 0:11all know my name i repeated this one
4. 0:13more time also
5. 0:16i'm performing the experiment for you
6. 0:19single and double displacement
7. 0:22reactions
8. 0:23uh
9. 0:25the purpose of the
10. 0:27recording
11. 0:28is for you to
12. 0:31record your observation
13. 0:34i'm not going to write down everything
14. 0:36for you and to just show you what
15. 0:38happened explain what happened and you
16. 0:40are going to
17. 0:41record the observation yourself so be
18. 0:44prepared
19. 0:46when you are watching this video so you
20. 0:48have your data sheet already open
21. 0:51so you can actually record your
22. 0:54observation one
23. 0:55single displacement double displacement
24. 0:58in general is a displacement reaction
25. 1:02you are starting with the reactants and
26. 1:05then you have your product
27. 1:07so a general format for single
28. 1:09displacement is a plus b that gives
29. 1:13a c plus d
30. 1:14a is going to be element
31. 1:17b is going to be a solution so it's a
32. 1:20methyl ion or you have a ionic compound
33. 1:24and then the product you're going to
34. 1:27have another solution with a new metal
35. 1:30if the reaction takes place
36. 1:32the reaction takes place under what
37. 1:34condition if the element that you're
38. 1:36adding
39. 1:37is more reactive than the metal ion
40. 1:40metal ion has a positive charge the
41. 1:42element that you're adding neutral
42. 1:44because you take piece of magnesium or
43. 1:46zinc it's a neutral compound so you have
44. 1:49this neutral
45. 1:50magnesium doesn't have any charges so if
46. 1:54magnesium
47. 1:56let's say is more reactive than
48. 1:59copper
49. 2:00and you have your copper in the solution
50. 2:03copper has a two plus charge in the
51. 2:04solution so you have metal ion is called
52. 2:07copper iron copper two plus that would
53. 2:10be your metal ion the metal that you are
54. 2:12adding this is just an example
55. 2:14is magnesium so your magnesium is a
56. 2:17metal is your magnesium and your metal
57. 2:19ion is
58. 2:20uh copper 2 plus snap if magnesium is
59. 2:23more reactive than copper
60. 2:26magnesium
61. 2:27more reactive metal than copper that
62. 2:29means magnesium can give electrons
63. 2:32when the magnesium gives electron to
64. 2:33copper copper is going to take the
65. 2:35electrons basically be reduced
66. 2:38and changes to copper zero or copper in
67. 2:41the elemental position
68. 2:44or
69. 2:45neutral copper
70. 2:47so
71. 2:48if copper comes out of the solution
72. 2:50magnesium goes into solution there are a
73. 2:52couple things we have to see we have to
74. 2:53see like particles like the
75. 2:56the cupric color red particles coming
76. 2:58out of the solution that's copper
77. 3:00magnesium should disappear that's
78. 3:02another evidence
79. 3:04copper sulfate is blue color
80. 3:06magnesium sulfate is uh
81. 3:09no color it's a colorless solution so
82. 3:12the color of the blue has to also be
83. 3:15lightened so it should get lighter and
84. 3:17lighter as the copper is coming out of
85. 3:20the solution so the color blue color
86. 3:22should fade it out it should get if you
87. 3:25add enough magnesium and you wait
88. 3:26forever
89. 3:27of course it's going to be colorless
90. 3:29solution so for me because it's
91. 3:32qualitative analysis as soon as i see
92. 3:34evidence for the reaction i'm going to
93. 3:36move on to the next one
94. 3:38so i'm not going to wait until the all
95. 3:41of the magnesium react with all the
96. 3:42color you know the full blue color is
97. 3:44going to disappear
98. 3:47so
99. 3:48make sure
100. 3:49you are going to record your observation
101. 3:51fast with me
102. 4:01and part one
103. 4:03you are going to follow the procedure
104. 4:05read the procedure read the introduction
105. 4:07part before you actually record your
106. 4:09observation is like basically coming
107. 4:11ready to the lab you have done your
108. 4:13pre-lap already you know what single
109. 4:15displacement is what is double
110. 4:17displacement what are you trying to
111. 4:18what's the purpose of the experiment
112. 4:20what you're trying to do
113. 4:21but i start with the following procedure
114. 4:24with just a minor explanation about the
115. 4:26experiment what we are doing so you have
116. 4:28an idea of what we are doing in case you
117. 4:30watch the video first we're going to
118. 4:32follow the procedure label test tubes a2
119. 4:35f and
120. 4:36replace these chemicals that is given in
121. 4:39the procedure for a is going to be lead
122. 4:41nitrate
123. 4:44a is going to be
124. 4:46lead nitrate so i'm going to add lead
125. 4:49nitrate to first one just following the
126. 4:51procedure adding that nitrate to the
127. 4:53first test
128. 4:55okay
129. 4:57silver nitrate
130. 4:59to b
131. 5:03copper sulfate to c
132. 5:10let nitrate
133. 5:12to d
134. 5:15magnesium chloride to e
135. 5:18sink all right
136. 5:21to
137. 5:22f
138. 5:24nacl2
139. 5:26g
140. 5:30nacl2g
141. 5:32and kcl2
142. 5:35h
143. 5:38and step two says
144. 5:41to get the copper
145. 5:44zinc
146. 5:45and magnesium
147. 5:47until there are clean pieces of copper
148. 5:49magnesium and zinc
149. 5:51to the
150. 5:52first one
151. 5:54we are going to add
152. 5:56to a and b
153. 5:58we are going to add piece of copper to a
154. 6:01and b
155. 6:03i try to polish it just to make sure
156. 6:05that it's shiny it's clean
157. 6:09okay a
158. 6:11and b
159. 6:21to test tube c and d i'm going to add
160. 6:25a piece of zinc metal
161. 6:29so take two pieces of zinc
162. 6:32one for each
163. 6:34magnesium two f g and
164. 6:37h
165. 6:38take care three pieces of magnesium
166. 6:49going to polish them
167. 6:51what are we looking for
168. 6:53we are looking for evidence of a
169. 6:55reaction
170. 6:57meaning that the metal
171. 7:01it's going to go in
172. 7:03and the metal ion comes out of the
173. 7:06solution
174. 7:09for single displacement you have this
175. 7:11table
176. 7:12that you need to fill up
177. 7:14so for a
178. 7:17when we have like lead nitrate
179. 7:19the methyl iron is going to be
180. 7:22lead two plus because it's electro
181. 7:25nitrate
182. 7:26the metal that we added is copper
183. 7:31copper
184. 7:32plus the
185. 7:36length
186. 7:37if there is a reaction
187. 7:39if we see any reaction here we are going
188. 7:41to record reaction and if there is no
189. 7:45reaction we record
190. 7:47no reaction so we have reaction or no
191. 7:49reaction so we're going to say
192. 7:51uh no reaction if there is a if there's
193. 7:55evidence for reaction
194. 7:57if the color did not change
195. 8:00if the
196. 8:01the let didn't come out so we didn't see
197. 8:03any particles of gray color of lead
198. 8:06coming out
199. 8:08then there is no reaction so we just say
200. 8:11no reaction for the first one test tube
201. 8:13a
202. 8:14then there is no reaction okay make sure
203. 8:17you record that
204. 8:22for b
205. 8:26okay
206. 8:27see what happens for b
207. 8:30the particles
208. 8:32silver particles are coming out
209. 8:35and copper is going in
210. 8:38the solution change color and we see
211. 8:40those particles
212. 8:43the gray color or silver color particles
213. 8:45coming out
214. 8:47so there is a reaction here
215. 8:49your metal ion
216. 8:51was silver
217. 8:53and the metal is
218. 8:55copper
219. 8:56copper gave electrons to
220. 9:02for
221. 9:04lead
222. 9:05and
223. 9:07i'm sorry this is zinc
224. 9:09with copper sulfate
225. 9:11test tube c
226. 9:13copper sulfate
227. 9:15with zinc
228. 9:16you see the color
229. 9:20see those particles
230. 9:23in the test tube
231. 9:25that's the evidence that yes there was a
232. 9:28reaction those are like copper pieces of
233. 9:31copper coming out and lead is going into
234. 9:34the solution so we see this red color
235. 9:37particles that is copper is coming out
236. 9:39so for test tube c
237. 9:42there is a reaction
238. 9:44okay test tube see there is a reaction
239. 9:47your metal
240. 9:49was copper the metal that was added was
241. 9:53zinc
242. 9:54and there is a reaction
243. 9:57zinc was added to
244. 10:02lead
245. 10:03zlink is added to lead nitrate
246. 10:06so d is lead nitrate
247. 10:08zinc reacted with the lead nitrate zinc
248. 10:12is going in
249. 10:14and the lead is coming out see the
250. 10:16particles the particles are on the wall
251. 10:19just bringing closer to the camera for
252. 10:21you to see it
253. 10:23the
254. 10:24zinc
255. 10:25reacted with lead nitrate as well
256. 10:28what does it mean
257. 10:30it means zinc is more reactive than lead
258. 10:34zinc can give electrons to
259. 10:37lead basically this is like oxidation
260. 10:39reduction type reaction zinc is being
261. 10:42oxidized lead is being reduced
262. 10:47e
263. 10:48what do we have for e
264. 10:50we have zinc
265. 10:52and
266. 10:53magnesium
267. 10:57zinc and
268. 10:58magnesium okay i don't see any reaction
269. 11:01so no reaction
270. 11:03zinc magnesium no reaction
271. 11:11next one magnesium is
272. 11:14with f is
273. 11:17magnesium with zinc
274. 11:19if
275. 11:20zinc doesn't have reaction with
276. 11:22magnesium then magnesium has must have
277. 11:25reaction with the with the zinc when is
278. 11:27like the zinc is in the solution i think
279. 11:31in the solution so metal ion is zinc and
280. 11:34the metal is magnesium and that is a yes
281. 11:37reaction
282. 11:38okay there's reaction here you see the
283. 11:41particles coming out
284. 11:43and the magnesium is going in into
285. 11:45solution so for a test tube f
286. 11:49there is a reaction
287. 11:51okay with a sub f there is a reaction
288. 11:53when you have magnesium in zinc
289. 11:59magnesium with sodium chloride clear
290. 12:02solution nothing happened no particle
291. 12:04came out no reaction
292. 12:06so you have no reaction here for
293. 12:08magnesium
294. 12:09with sodium chloride
295. 12:12g test tube g no reaction
296. 12:16tester general reaction
297. 12:19h
298. 12:20magnesium with sodium
299. 12:23chloride no reaction either see it's
300. 12:25clear solution no particles came out
301. 12:28so no reaction
302. 12:30letter h there is no reaction
303. 12:37seven
304. 12:39hopefully you can record all your
305. 12:40observation and and uh complete the data
306. 12:44sheet
307. 12:44for
308. 12:46experiment seven and turn it in as an
309. 12:49assignment to your professor if it's me
310. 12:51or anyone
311. 12:52else
312. 12:58[Music]