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CAIE A-Level Chemistry AS 8.1.3 Experimental Data to Calculate the Rate Questions

Practise calculating average rate and interpreting experimental tables and concentration-time graphs using CAIE 9701 AS questions and mark schemes.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Use experimental data and graphs to calculate and interpret average rate of reaction.

CAIE A-Level Chemistry AS 8.1.3 Experimental Data to Calculate the Rate Questions question 1

[Maximum number: 1]

The factors affecting the rate of reaction between aqueous sodium thiosulfate and hydrochloric acid can be investigated. The ionic equation for the reaction is shown.

S2O32−(aq)+2H+(aq)→H2O(l)+S( s)+SO2(aq)\mathrm{S}_{2} \mathrm{O}_{3}^{2-}(\mathrm{aq})+2 \mathrm{H}^{+}(\mathrm{aq}) \rightarrow \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{S}(\mathrm{~s})+\mathrm{SO}_{2}(\mathrm{aq})

Which of the following can be used to investigate the rate of this reaction?
1 change of mass
2 change of appearance caused by formation of a precipitate
3 change of electrical conductivity

A

1, 2 and 3 are correct

B

1 and 2 only are correct

C

2 and 3 only are correct

D

1 only is correct

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