Grade 12 Chemistry: Rate Laws Worksheet
Explore the fundamentals of chemical kinetics, including rate laws, reaction orders, and factors affecting reaction rates.
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Grade 12 Chemistry: Rate Laws
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Read each question carefully and provide your best answer. Show all your work for calculations.
1. Which of the following statements is true regarding the rate law of a reaction?
It can be determined from the stoichiometry of the balanced chemical equation.
It describes how the rate of reaction depends on the concentration of reactants.
It is always the same for a given reaction, regardless of temperature.
It depends on the activation energy of the reaction.
2. For the reaction A + B → C, if the rate law is rate = k[A]^2[B], what is the overall order of the reaction?
First order
Second order
Third order
Zero order
3. The rate constant, k, is specific for a particular reaction at a given .
4. For a zero-order reaction, the rate of reaction is independent of the concentration.
5. Consider the reaction: 2NO(g) + O2(g) → 2NO2(g). Experimental data shows that when the concentration of NO is doubled, the reaction rate quadruples. When the concentration of O2 is doubled, the reaction rate doubles. Determine the rate law for this reaction.
6. Explain the difference between the order of a reaction with respect to a reactant and the overall order of a reaction.
7. The half-life of a first-order reaction is dependent on the initial concentration of the reactant.
True
False
8. Increasing the temperature of a reaction generally increases the rate constant, k.
True
False
9. The decomposition of N2O5(g) is a first-order reaction with a rate constant of 6.2 x 10^-4 s^-1 at a certain temperature. If the initial concentration of N2O5 is 0.40 M, what will be its concentration after 30 minutes?
10. Analyze the following reaction coordinate diagram and answer the questions below:
a) Is this reaction endothermic or exothermic? Justify your answer.
b) Label the activation energy for the forward reaction and the reverse reaction on the diagram.
(Note: You do not need to physically label the image, just describe where they would be.)
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