Orders of reactions and rate equations

Last updated: 10/02/2020

WJEC A-Level Chemistry Unit 3.5 – Chemical kinetics Orders of reactions and rate equations

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Question 1 of 22

1. Question
What is the definition of the order of a reaction?
- 1. The power to which the rate of the reactant is raised in the rate equation
- 2. The rate of a reaction
- 3. The sequence of a reaction
- 4. Tells you how a reactants concentration effects the rate of reaction
Question 2 of 22

2. Question
What is the definition of the overall order of a reaction?
- 1. The sum of all concentrations
- 2. The sum of all individual orders of the products
- 3. The sum of all individual orders
- 4. The sum of all individual orders of the reactants
Question 3 of 22

3. Question
How do you work out the overall order of a reaction?
- 1. Times the individual order of the reactants and products
- 2. Add the individual orders of the products
- 3. Add the individual orders of the reactants
- 4. Add the individual orders of the reactants and products
Question 4 of 22

4. Question
What is the definition of the rate constant?
- 1. The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their volumes in the rate equation
- 2. The constant that links the rate of reaction with the volumes of the reactants raised to the powers of their orders in the rate equation
- 3. The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their order
- 4. The constant that links the rate of reaction with the orders of the reactants raised to the powers of their concentrations in the rate equation
Question 5 of 22

5. Question
What is the symbol for the rate constant?
- 1. O
- 2. K
- 3. C
- 4. R
Question 6 of 22

6. Question
What is a rate equation?
- 1. An equation used to calculate the speed of a reaction
- 2. An equation used to calculate the length of a reaction
- 3. An equation used to calculate the order of a reaction
- 4. An equation used to calculate the concentration of a reaction
Question 7 of 22

7. Question
What are the units for rate?
- 1. $mol dm^{-3} s^{-1}$
- 2. $mol dm^{-3} s^1$
- 3. $mol dm^3 s^{-1}$
- 4. $mol dm^3 s^1$
Question 8 of 22

8. Question
How is zero order represented?
- 1. [A] $^3$
- 2. [A] $^2$
- 3. [A] $^1$
- 4. [A] $^0$
Question 9 of 22

9. Question
How is first order represented?
- 1. [A] $^3$
- 2. [A] $^2$
- 3. [A] $^1$
- 4. [A] $^0$
Question 10 of 22

10. Question
How is second order represented?
- 1. [A] $^3$
- 2. [A] $^2$
- 3. [A] $^1$
- 4. [A] $^0$
Question 11 of 22

11. Question
What happens to a reactant within an equation when it has a zero order?
- 1. It is to the power of one
- 2. It is to the power of two
- 3. It does not appear
- 4. Its value is doubled
Question 12 of 22

12. Question
What happens to a reactant within an equation when it has a first order?
- 1. Its value is doubled
- 2. It is to the power of one
- 3. It is to the power of two
- 4. It does not appear
Question 13 of 22

13. Question
What happens to a reactant within an equation when it has a second order?
- 1. It is to the power of two
- 2. Its value is doubled
- 3. It does not appear
- 4. It is to the power of one
Question 14 of 22

14. Question
When a reactant is zero order, how is the rate affected by a concentration change?
- 1. Rate is not affected by a concentration change
- 2. Rate change is doubled by a the change in concentration
- 3. Rate change is directly proportional to the change in concentration
- 4. Rate change will be the same as the change in concentration squared
Question 15 of 22

15. Question
When a reactant is first order, how is the rate affected by a concentration change?
- 1. Rate change is directly proportional to the change in concentration
- 2. Rate is not affected by a concentration change
- 3. Rate change is doubled by a the change in concentration
- 4. Rate change will be the same as the change in concentration squared
Question 16 of 22

16. Question
When a reactant is second order, how is the rate affected by a concentration change?
- 1. Rate change will be the same as the change in concentration squared
- 2. Rate change is doubled by a the change in concentration
- 3. Rate is not affected by a concentration change
- 4. Rate change is directly proportional to the change in concentration
Question 17 of 22

17. Question
Find the overall order of the following reaction. $Rate = [A]^2[B]^1[C]^1$
- 1. 4
- 2. 3
- 3. 2
- 4. 0
Question 18 of 22

18. Question
Find the overall order of the following reaction. $Rate = [A]^1[B]^2$
- 1. 3
- 2. 0
- 3. 1
- 4. -1
Question 19 of 22

19. Question
Find the overall order of the following reaction. $Rate = [A]^2[B]^2[C]^0$
- 1. 4
- 2. 1
- 3. 3
- 4. 2
Question 20 of 22

20. Question
What are the units for a reaction with zero order?
- 1. $mol dm^{-3} s^{-1}$
- 2. $dm^6 mol^{-2} s^{-1}$
- 3. $s^{-1}$
- 4. $dm^3 mol^{-1} s^{-1}$
Question 21 of 22

21. Question
What are the units for a reaction with first order?
- 1. $dm^6 mol^{-2} s^{-1}$
- 2. $s^{-1}$
- 3. $mol dm^{-3} s^{-1}$
- 4. $dm^3 mol^{-1} s^{-1}$
Question 22 of 22

22. Question
What are the units for a reaction with second order?
- 1. $s^{-1}$
- 2. $dm^6 mol^{-2} s^{-1}$
- 3. $mol dm^{-3} s^{-1}$
- 4. $dm^3 mol^{-1} s^{-1}$