AnswersVJSHS - Chemistry Full YearUnit Test

Unit Test — Unit test Answers

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Consider the following enthalpy diagram:Which label shows the overall enthalpy change and is the reaction exothermic or endothermic?

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A
A, exothermic.
B
B, exothermic.
C
C, endothermic.
D
D, endothermic.
22
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Two metal blocks that have slightly different temperatures are placed next to one another. After five minutes, they both have lower but equal temperatures. According to the law of conservation of energy, what most likely happened?

A
Energy was created inside the blocks.
B
Energy was destroyed inside the blocks.
C
Energy was absorbed into the blocks from outside the system.
D
Energy was transferred from the warmer block to the cooler block.
23

What is Gsystem for the system that is described by the following data?Hsystem = –232 kJ, T = 293 K, Ssystem = 195 J/KGsystem = Hsystem – TSsystem

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A
–289 kJ
B
–175 kJ
C
256 kJ
D
56,903 kJ
24

Which statement about spontaneous and nonspontaneous processes is correct?

A
Spontaneous processes are favored by a decrease in H, but nonspontaneous reactions are favored by an increase in H.
Option A
B
Spontaneous processes are favored by a decrease in S, but nonspontaneous reactions are favored by an increase in S.
Option B
C
An increase in S favors both spontaneous and nonspontaneous processes.
Option C
D
A decrease in H favors both spontaneous and nonspontaneous processes.
Option D
25

Consider the following intermediate chemical equations.When you form the final chemical equation, what should you do with CO?

Question illustration
A
Cancel out CO because it appears as a reactant in one intermediate reaction and a product in the other intermediate reaction.
B
Add the two CO molecules together, and write them as reactants in the final chemical reaction.
C
Write CO only once as a reactant in the final chemical reaction.
D
Write CO as a reactant and a product in the final chemical reaction.

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