Determination of rate equation

Last updated: 10/02/2020

WJEC A-Level Chemistry Unit 3.5 – Chemical kinetics Determination of rate equation

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Question 1 of 24

1. Question
What is the definition of half-life?
- Time taken for the concentration of a reactant to reduce by half
- Time taken for the volume of a reactant to reduce by half
- Time take for the amount of a reactant to reduce by half
- Time take for the number of moles of a reactant to reduce by half
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Question 2 of 24

2. Question
What is the symbol for half life?
- t $_{1/2}$
- TM $_{1/2}$
- T
- HL
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Question 3 of 24

3. Question
What instrument is used to measure colour changes?
- Colorimeter
- pH probe
- Thermometer
- pH meter
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Question 4 of 24

4. Question
What instrument is used to measure pH?
- pH meter
- Colorimeter
- Balance
- pH scale
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Question 5 of 24

5. Question
In terms of time, what is an equation for the rate of a reaction?
- 1/Time
- Time/In2
- Ln2/Time
- Ln2 x Time
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Question 6 of 24

6. Question
Within a concentration-time graph, how can the rate of a reaction be found?
- Find the gradient
- Initial concentration
- Find the steepest change
- Final concentration
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Question 7 of 24

7. Question
Using a rate-concentration graph, how can the rate constant be found?
- Find the gradient
- Find the average rate
- Find initial concentration
- Find the average concentration
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Question 8 of 24

8. Question
Which of the following techniques can be used to measure the concentrations for reactions involving acids or bases?
- Carrying out titrations
- Find a change in volume
- Looking at a colour change
- Measuring any gas release
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Question 9 of 24

9. Question
Which of the following techniques can be used to measure the concentrations for reactions involving acids or bases?
- Using a pH meter
- Measuring the loss of mass
- Via the formation of a precipitate
- Find a change in volume
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Question 10 of 24

10. Question
Which of the following techniques can be used to measure the concentrations for reactions involving gas production?
- Find a change in volume
- Measuring the loss of mass
- Via the formation of a precipitate
- Using a pH meter
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Question 11 of 24

11. Question
Which of the following techniques can be used to measure the concentrations for reactions involving gas production?
- Measuring the loss of mass
- Find a change in volume
- Via the formation of a precipitate
- Using a pH meter
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Question 12 of 24

12. Question
Which of the following techniques can be used to measure the concentrations for reactions that produce visual changes?
- Looking at a colour change
- Measuring any gas release
- Carrying out titrations
- Find a change in volume
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Question 13 of 24

13. Question
Which of the following techniques can be used to measure the concentrations for reactions that produce visual changes?
- Find a change in volume
- Using a pH meter
- Carrying out titrations
- Via the formation of a precipitate
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Question 14 of 24

14. Question
Describe the half life for a zero order reaction.
- Decreases with time
- Increases with time
- Decreases at double the time
- Constant half-life
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Question 15 of 24

15. Question
Describe the half life for a first order reaction.
- Constant half-life
- Increases with time
- Decreases at double the time
- Decreases with time
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Question 16 of 24

16. Question
Write the equation that links the rate constant with half life.
- Rate constant = ln2 / half life
- Half life = ln2 / rate constant
- Half life = ln2 x rate constant
- Rate constant = ln2 x half life
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Question 17 of 24

17. Question
For which order of reaction is the equation linking the rate constant and half life used?
- First order
- Zero order
- Second order
- Third order
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Question 18 of 24

18. Question
Describe the shape of a concentration-time graph of a reaction with zero order.
- Negative straight line graph
- Negative curved line graph
- Positive curved line graph
- Positive straight line graph
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Question 19 of 24

19. Question
Describe the shape of a concentration-time graph of a reaction with first order.
- Negative curved graph
- Positive curved graph
- Negative straight line
- Positive straight line graph
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Question 20 of 24

20. Question
Within a rate-concentration graph, which axis does rate lie on?
- Y axis
- X axis
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Question 21 of 24

21. Question
Within a rate-concentration graph, which axis does concentration lie on?
- X axis
- Y axis
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Question 22 of 24

22. Question
Describe the shape of a rate-concentration graph of a reaction with zero order.
- Straight horizontal line
- Straight line through the origin
- Increasing curve
- Decreasing curve
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Question 23 of 24

23. Question
Describe the shape of a rate-concentration graph of a reaction with first order.
- Straight line through the origin
- Straight horizontal line
- Increasing curve
- Decreasing curve
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Question 24 of 24

24. Question
Describe the shape of a rate-concentration graph of a reaction with second order.
- Increasing curve
- Decreasing curve
- Straight line through the origin
- Straight horizontal line
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