Chemistry Quiz No. 3
Chemistry Quiz no. 3
Questions and Answers
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- 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,reliteExplanation
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.Rate this question:
- 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,maxExplanation
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.Rate this question:
- 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,0Explanation
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.Rate this question:
- 31.
What is the energy change for this reaction? ________ KJ/mol
Correct Answer
-97Explanation
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.Rate this question:
- 32.
What is the bond energy of the C=O bond? ________
Correct Answer
841,+841Explanation
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.Rate this question:
- 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 nitrateExplanation
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.Rate this question:
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Apr 08, 2023Quiz Edited by
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Apr 07, 2020Quiz Created by
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