الفرض الأول من الدورة الأولى مادة النشاط العلمي المستوى السادس ابتدائي — Transcript

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1. 0:01Peace, mercy, and blessings of God be
2. 0:03upon you.
3. 0:04Welcome to a new video on our channel,
4. 0:06The Learning Journey.
5. 0:08In this video, God willing, I will
6. 0:10correct the first exam model of the
7. 0:12first semester for the subject of
8. 0:14Scientific Activity for the sixth grade
9. 0:16of primary school.
10. 0:18So, the first question is: complete the
11. 0:20following sentences with what is
12. 0:21appropriate. I have here a group of
13. 0:24terms: nitrogen, carbon dioxide, heat,
14. 0:2778%,
15. 0:30combustor, air, soot, other gases, water
16. 0:33vapor, combustion mass.
17. 0:35Dihydrogen oxygen (oxygen). The candle,
18. 0:38the combustor, and cold. It consists of
19. 0:4121%of gas and. And of gas di-. So here,
20. 0:45naturally, air consists of. Observe well
21. 0:48the word we will write. We will
22. 0:50determine it. Air consists of
23. 0:5721%, of course.
24. 0:5921%of dioxygen gas.
25. 1:03Of dioxygen gas.
26. 1:13And 78%
27. 1:17Of dinitrogen gas. And, and 78%
28. 1:24Or 78%of dinitrogen gas.
29. 1:30And, and of. Other gases.
30. 1:341%of other gases.
31. 1:38These are the components of air. Air
32. 1:40consists of di-.
33. 1:4221%of dioxygen.
34. 1:4578%of dinitrogen gas.
35. 1:48And other gases.
36. 1:52Air expands due to, so. Air expands due
37. 1:56to heat.
38. 2:02And contracts due to, of course, cold.
39. 2:05So, it expands due to heat and contracts
40. 2:07due to cold.
41. 2:11And it has, so air has mass.
42. 2:14It has mass.
43. 2:21Three elements are required for the
44. 2:24occurrence of, so of course for
45. 2:27combustion to occur, three elements are
46. 2:30required.
47. 2:37These elements are the energy source, a
48. 2:39combustible body called the combustor.
49. 2:42So, combustible is called the combustor
50. 2:45.
51. 2:52And dioxygen is called the combustor.
52. 2:55So, dioxygen is called the combustor.
53. 3:03Resulting from its combustion in the air
54. 3:06. Gas, so resulting from the combustion
55. 3:08of the candle, from the combustion of
56. 3:11the candle.
57. 3:15In the air is carbon dioxide gas, so
58. 3:18carbon dioxide gas, water vapor, and
59. 3:22soot.
60. 3:23These are the products of candle
61. 3:25combustion. Candle. So carbon dioxide
62. 3:27gas. Carbon.
63. 3:33Carbon dioxide. And soot.
64. 3:39And water vapor.
65. 3:48Second, identify the type of danger
66. 3:50based on the prevention indicators. I
67. 3:52have fire, suffocation, explosion.
68. 3:55I have the type of danger.
69. 3:57And I have indicators for preventing
70. 3:58this danger, providing ventilation.
71. 4:02Sufficient for places where fuels are
72. 4:04used.
73. 4:06So here, of course, the type of danger
74. 4:08is suffocation.
75. 4:10These are the indicators for preventing
76. 4:12suffocation, which is to provide
77. 4:14sufficient ventilation, so suffocation.
78. 4:23Avoid butane gas leakage, so of course
79. 4:26we must avoid butane gas leakage. For
80. 4:30fear of explosion. So the type of danger
81. 4:32is explosion. Explosion.
82. 4:37Avoid. The fire triangle. So of course,
83. 4:40avoid the fire triangle to avoid the
84. 4:42type of danger, which is fire. Avoid
85. 4:44fire. Fire.
86. 4:49Third. Write true or false in the
87. 4:51appropriate place.
88. 4:53Air contracts due to rising heat, so.
89. 4:56Rather, it expands due to. Rising heat,
90. 4:59so false.
91. 5:03Dioxygen is necessary for the combustion
92. 5:06process, so it is called the combustor
93. 5:08and it is dioxygen.
94. 5:11The combustion of a candle in the air
95. 5:14produces only light and heat, so no, but
96. 5:16light and heat and also carbon dioxide,
97. 5:19and we said water vapor and soot, so
98. 5:21false.
99. 5:27Combustion in closed spaces does not
100. 5:30lead to any risks; on the contrary, it
101. 5:32leads to suffocation, so it is false.
102. 5:43Fourth, the gas with the largest volume
103. 5:45in the air is carbon dioxide. Or
104. 5:47dioxygen. Or dinitrogen. So, naturally,
105. 5:50the largest gas in the air.
106. 5:52Or the one with the largest volume in
107. 5:55the air is dinitrogen gas, which makes
108. 5:58up 78%, the largest proportion.
109. 6:04Fifth, Badr placed an inflated ball on
110. 6:07an electronic scale.
111. 6:10Observe carefully: an inflated ball on
112. 6:12an electronic scale, then he emptied it
113. 6:15of air and weighed it again.
114. 6:18Look closely at document one; the ball,
115. 6:21when inflated with air, weighed 445
116. 6:24grams, then when he emptied it of air,
117. 6:27he found its weight was 439 grams. So,
118. 6:31what do you observe? I observe that the
119. 6:34mass of the ball decreased. Or the mass
120. 6:36of the ball decreases after emptying it
121. 6:38of air.
122. 6:39So it decreases.
123. 6:42The mass of the ball. So the mass of the
124. 6:45ball decreased after we emptied it of
125. 6:47air.
126. 6:48The mass of the ball decreases after
127. 6:51emptying it of air.
128. 6:59The mass of the ball decreases after
129. 7:01emptying it of air.
130. 7:03What do you conclude? We conclude that
131. 7:06air has mass.
132. 7:08Air has mass, of course, air has mass.
133. 7:12Calculate the mass of the air that Badr
134. 7:15emptied from the ball; the mass that
135. 7:18Badr emptied from the ball, if the mass
136. 7:22of the ball was 445 grams.
137. 7:27Upon emptying it, we found 439 grams. So
138. 7:31we will subtract 439 grams from 445
139. 7:34grams. So 445.
140. 7:38Minus 439.
141. 7:40Equals 6 grams.
142. 7:42So the mass of the air after emptying,
143. 7:45or the mass of the air that was in the
144. 7:48ball, is 6 grams.
145. 7:50With this, I have reached the end of
146. 7:53this video; I hope you have benefited.
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152. 8:05a new video, God willing. Good luck.