CAIE IGCSE Chemistry 6.2.4 Interpret Data Questions

Read reaction-rate graphs by comparing gradients, identifying completion plateaus and predicting how changed conditions affect curve shape and final gas volume.

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
interpret how concentration, surface area or dilution changes curve steepness
predict whether a changed reactant amount alters the final volume of gas

[Maximum number: 1]

A student adds excess magnesium ribbon to $10 \mathrm{~cm}^{3}$ of $0.5 \mathrm{~mol} / \mathrm{dm}^{3}$ sulfuric acid.
The hydrogen gas produced is collected and its total volume is measured every 10 seconds.
The experiment is repeated with $5 \mathrm{~cm}^{3}$ of $0.5 \mathrm{~mol} / \mathrm{dm}^{3}$ sulfuric acid added to $5 \mathrm{~cm}^{3}$ of water using the same mass of magnesium ribbon.

Which line on the graph shows the results of the second experiment?

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CAIE IGCSE Chemistry 6.2.4 Interpret Data Questions question 1