Maxwell–Boltzmann distribution

Last updated: 29/01/2021

AQA A-Level Chemistry Kinetics Maxwell–Boltzmann distribution

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Question 1 of 20

1. Question
What is the definition of the Maxwell-Boltzmann distribution?
- Shows the number of molecules in a substance with different energies
- The distribution of concentrations of molecules at a given temperature
- The average bond energies of molecules
- The distributions of energies needed to start a chemical reaction
Question 2 of 20

2. Question
What two variables make up the Maxwell-Boltzmann distribution graph?
- Number of molecules – kinetic energy
- Volume – kinetic energy
- Number of molecules – time
- Time – concentration
Question 3 of 20

3. Question
What variable is on the x-axis of the Maxwell-Boltzmann distribution?
- Kinetic energy
- Temperature
- Number of molecules
- Concentration
Question 4 of 20

4. Question
What variable is on the y-axis of the Maxwell-Boltzmann distribution?
- Number of molecules
- Kinetic energy
- Temperature
- Concentration
Question 5 of 20

5. Question
What does the area under the Maxwell-Boltzmann distribution curve signify?
- Total number of molecules
- Total amount of energies
- Temperature
- Rate of a reaction
Question 6 of 20

6. Question
What is the symbol for activation energy?
- $E_a$
- $E_c$
- $A_e$
- $C_a$
Question 7 of 20

7. Question
What is the symbol for activation energy with a catalyst?
- $E_c$
- $E_a$
- $A_e$
- $C_a$
Question 8 of 20

8. Question
What happens to the activation energy of a reaction when a catalyst is added?
- Lowered
- Removes activation energy
- Stays the same
- Raised
Question 9 of 20

9. Question
In terms of activation energy, which molecules on the Maxwell-Boltzmann distribution curve can react?
- Those above the activation energy
- Those below the activation energy
- Those just below the activation energy
- Activation energy does not relate to the energies needed for a molecule to react
Question 10 of 20

10. Question
What happens to the rate of a reaction when the temperature is increased?
- Rate of reaction increases
- Rate of reaction decreases
- Reaction stops
- Rate of reaction stays the same
Question 11 of 20

11. Question
What happens to the shape of the Maxwell-Boltzmann distribution curve when temperature of a reaction is increased?
- Flattens and shifts to the right
- Flattens and shifts to the left
- Widens and shifts to the right
- Widens and shifts to the left
Question 12 of 20

12. Question
What happens to the area under the Maxwell-Boltzmann distribution curve when the temperature of a reaction is increased?
- Nothing
- Slightly increases
- Decreases
- Increases
Question 13 of 20

13. Question
What happens to the area under the Maxwell-Boltzmann distribution curve above the activation energy as the temperature is increased?
- Increases
- Decreases
- Nothing
- Nothing, unless a catalyst is used
Question 14 of 20

14. Question
What happens to the number of molecules as the temperature of a reaction increases?
- Nothing
- The duplicate
- They decrease
- The increase
Question 15 of 20

15. Question
In terms of activation energy, what happens to the proportion of molecules when the temperature of a reaction is increased?
- Higher proportion of molecules with energy greater than the activation energy
- Lower proportion of molecules with energy greater than the activation energy
- Activation energy is lowered, with a higher proportion of molecules containing energy greater than the activation energy
- Activation energy is raised, with a lower proportion of molecules containing energy greater than the activation energy
Question 16 of 20

16. Question
What happens to the shape of the Maxwell-Boltzmann distribution curve when a catalyst is added to a reaction?
- Nothing happens to the curve
- Flattens and shifts to the left
- Flattens and shifts to the right
- Widens and shifts to the right
Question 17 of 20

17. Question
What happens to the area under the Maxwell-Boltzmann distribution curve when the temperature of a reaction is decreased?
- Nothing
- Slightly increases
- Decreases
- Increases
Question 18 of 20

18. Question
What happens to the area under the Maxwell-Boltzmann distribution curve above the activation energy as the temperature is decreased?
- Decreases
- Increases
- Nothing
- Nothing, unless a catalyst is used
Question 19 of 20

19. Question
What happens to the number of molecules as the temperature of a reaction decreases?
- Nothing
- They duplicate
- They decrease
- They increase
Question 20 of 20

20. Question
Explain what happens to the energies of molecules during a reaction when a catalyst is added.
- Higher proportion of molecules will have energy higher than the activation energy
- Lower proportion of molecules will have energy higher than the activation energy
- More molecules will be added to a reaction
- Nothing will happen to the molecules