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?
- Tells you how a reactants concentration effects the rate of reaction
- The sequence of a reaction
- The rate of a reaction
- The power to which the rate of the reactant is raised in the rate equation
Question 2 of 22

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

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

4. Question
What is the definition of the rate constant?
- The constant that links the rate of reaction with the concentrations of the reactants raised to the powers of their order
- 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
- 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
- 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
Question 5 of 22

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

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

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

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

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

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

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

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

13. Question
What happens to a reactant within an equation when it has a second order?
- It is to the power of two
- Its value is doubled
- It does not appear
- 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?
- Rate is not affected by a concentration change
- Rate change is directly proportional to the change in concentration
- Rate change will be the same as the change in concentration squared
- Rate change is doubled by a the change in concentration
Question 15 of 22

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

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

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

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

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

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

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

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