CAIE IGCSE Chemistry 6.2.4 Interpret data

Practise interpreting rate graphs and tables to compare gradients, finish times, gas volumes and changing experimental conditions.

Exam points

use graph gradient to compare reaction rates at different times
deduce when a reaction finishes from a horizontal line on a gas-volume graph
sketch the effect of powder or dilution on curve steepness and final volume

[Maximum number: 1]

Hydrogen peroxide, $\mathrm{H}_{2} \mathrm{O}_{2}$ , decomposes into water and oxygen in the presence of a catalyst, manganese(IV) oxide.

2 \mathrm{H}_{2} \mathrm{O}_{2}(\mathrm{aq}) \rightarrow 2 \mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{O}_{2}(\mathrm{~g})

A student studies the rate of decomposition of hydrogen peroxide using the apparatus shown. The student uses $20 \mathrm{~cm}^{3}$ of $0.1 \mathrm{~mol} / \mathrm{dm}^{3}$ hydrogen peroxide and 1.0 g of manganese(IV) oxide.

The student measures the volume of oxygen given off at regular time intervals until the reaction stops. A graph of the results is shown.

Figure for Question 6.2.4—Interpret data question 1 — CAIE IGCSE Chemistry

When is the rate of reaction highest?

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6.2.4—Interpret data question 1