Edexcel A-Level Chemistry AS 9.3 The Rate of a Reaction From I the Time Taken for a Reaction Questions

Practise Edexcel IAL Chemistry 9.3 by calculating reciprocal rates, drawing tangents, finding gradients and reporting rate units from experimental data.

Exam points

Calculate relative rate as 1/time and report reciprocal-second units and suitable precision.
Draw a tangent at zero or a stated time and calculate its gradient from two points.
Derive rate units from the measured concentration, amount or gas volume divided by time.

[Maximum number: 1]

Rhubarb stems contain ethanedioic acid. Ethanedioic acid reacts with acidified potassium manganate(VII), $\mathrm{KMnO}_{4}$ , and decolorises the solution.

A student carried out an experiment using rhubarb juice as a source of ethanedioic acid.

The student used different volumes of rhubarb juice and a constant volume of manganate(VII) as shown. An indication of rate was calculated using $1 \div \mathrm{t}$ .

Complete the table.

Table for Question Edexcel A-Level Chemistry AS 9.3 The Rate of a Reaction From I the Time Taken for a Reaction Questions question 1 — Edexcel A-Level Chemistry AS

807

υ.υσο-й

0.40

(1)

- boxes completed to 3SF

261

0.00383

3.83

, 40

ก กค.A.T

$1{ }^{m}$

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Edexcel A-Level Chemistry AS 9.3 The Rate of a Reaction From I the Time Taken for a Reaction Questions question 1