Chemistry Quiz No. 3

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Quizzes Created: 2 | Total Attempts: 82

Questions: 34 | Attempts: 42 | Updated: Apr 8, 2023

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Chemistry Quiz no. 3

Questions and Answers

1.

Choose the best answer:
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A. A
2.

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C. C
3.

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A. A
4.

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D. D
5.

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B. B
6.

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B. B
7.

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B. B
8.

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C. C
9.

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C. C
10.

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D. D
11.

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A. A
12.

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B. B
13.

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A. A
14.

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C. C
15.

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C. C
16.

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D. D
17.

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B. B
18.

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D. D
19.

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B. B
20.

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B. B
21.

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A. A
22.

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A. A
23.

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A. A
24.

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A. A
25.

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B. B
26.

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B. B
27.

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B. B
28.

A gas was formed at the anode. Identify this gas and give the test for this gas. gas ................ ________ test ................________ result of test ................________

Correct Answer
oxygen,o2
glowing splint
relights,relight,relite

Explanation
The gas formed at the anode is oxygen (O2). The test for this gas is performed using a glowing splint. When the glowing splint is introduced to the gas, it relights or relights, indicating the presence of oxygen.

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4
29.

In the graph below, the rate of reaction at point A is the ________ (slowest, fastest, zero) because the amount of reactants particles is ________ (maximum, minimum, zero).

Correct Answer
fastest,faster
maximum,max

Explanation
The rate of reaction at point A is the fastest because the amount of reactant particles is at its maximum. This means that there are a high number of reactant particles available for the reaction to occur, resulting in a faster rate of reaction.

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4
30.

In the graph below, the rate of reaction at point C is the ________ (slowest, fastest, zero) because the amount of reactants particles is ________ (maximum, minimum, zero).

Correct Answer
zero,0
zero,0

Explanation
At point C on the graph, the rate of reaction is zero because there is no change in the concentration of reactants over time. This means that the reaction is not progressing at all. Additionally, the amount of reactant particles is also zero at point C because all of the reactants have been completely consumed, resulting in no further reaction taking place.

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4
31.

What is the energy change for this reaction? ________ KJ/mol

Correct Answer
-97

Explanation
The energy change for this reaction is -97 KJ/mol. This negative value indicates that the reaction is exothermic, meaning that it releases energy. The magnitude of -97 KJ/mol represents the amount of energy released per mole of reactant.

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4
32.

What is the bond energy of the C=O bond? ________

Correct Answer
841,+841

Explanation
The bond energy of the C=O bond is 841 kJ/mol. This indicates the amount of energy required to break one mole of C=O bonds in a compound. The positive sign indicates that energy is absorbed during the breaking of the bond. The repetition of the value (+841) suggests that this bond energy is the same for both the forward and reverse reactions, meaning it requires the same amount of energy to break or form the C=O bond.

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4
33.

To plate the steel spoon in the diagram below with cobalt, the metal electrode must be made of ________ (steel, cobalt, copper), and the electrolyte must be ________ (cobalt carbonate, cobalt phosphate, cobalt nitrate)

Correct Answer
cobalt
cobalt nitrate

Explanation
To plate the steel spoon with cobalt, the metal electrode must be made of cobalt. This is because the metal electrode needs to be made of the same metal that is being plated onto the spoon. The electrolyte, which is the solution that facilitates the plating process, must be cobalt nitrate. Cobalt nitrate is commonly used as an electrolyte for cobalt plating because it provides the necessary cobalt ions for the plating reaction to occur.

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4
34.

Which one do you like?
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B. B