Rates of reaction

Past Paper Questions

National 5 Chemistry Specimen Paper

1. Graphs can be used to show the change in the rate of a reaction as the reaction proceeds.

The graph shows the volume of gas produced in an experiment over a period of time.

(a) State the time, in seconds, at which the reaction stopped. 1

(b) Calculate the average rate of reaction, in cm3 s–1, for the first 20 seconds. Show your working clearly.

2 (c) The graph shows that the rate of reaction decreases as the reaction proceeds. Suggest a reason for this.

1

2011 Higher Section B Q.1

1

2012 Higher Section B

1

2011 Intermediate 2 Q.4

2

1

2012 Intermediate 2

1

1

2013 Intermediate 2 Q. 3

1

SQA Standard Grade Chemistry Credit Paper 2012

13. (b)

SQA Intermediate 2 2010

Past Paper Answers

2011 Higher Section B Q.1

2011 Higher Section B Q.1

2012 Higher Section B

2011 Intermediate 2 Q.4

2012 Intermediate 2

2013 Intermediate 2 Q. 3

SQA Standard Grade Chemistry Credit Paper 2012

13. (b) UNACCEPTABLE ANSWER

SQA Intermediate 2 2010

2. D