Chemistry Quiz No. 3

Chemistry

Grade 9th

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Quizzes Created: 2 | Total Attempts: 403

| Attempts: 215 | Questions: 34 | Updated: Apr 8, 2025

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About This Quiz

Chemistry Quiz no. 3 assesses knowledge through multiple choice questions, focusing on fundamental concepts. It's designed to evaluate understanding and application skills in chemistry, serving as a useful tool for learners to gauge their proficiency.

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25. What is the energy change for this reaction? _____ KJ/mol

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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30. 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)

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

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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32. 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).

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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33. What is the bond energy of the C=O bond? _____

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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34. 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).

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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