CAIE IGCSE Chemistry 6.2.3 Practical Methods for Investigating Questions

Choose suitable apparatus and measurements for tracking gas volume or mass loss against time in reaction-rate experiments.

Exam points

select gas syringe or mass-loss apparatus for reactions producing a gas
state the measurements needed to determine rate from gas volume or mass change against time
explain why flask mass decreases when a gaseous product escapes
suggest a valid method for measuring rate in an unfamiliar experiment

[Maximum number: 1]

The apparatus shown is used to measure the rate of a reaction.

Which equation represents a reaction where the rate can be measured using this apparatus?

$\mathrm{Mg}(\mathrm{s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MgCl}_{2}(\mathrm{aq})+\mathrm{H}_{2}(\mathrm{~g})$

$\mathrm{HCl}(\mathrm{aq})+\mathrm{NaOH}(\mathrm{aq}) \rightarrow \mathrm{NaCl}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})$

$\mathrm{Fe}(\mathrm{s})+\mathrm{CuSO}_{4}(\mathrm{aq}) \rightarrow \mathrm{Cu}(\mathrm{s})+\mathrm{FeSO}_{4}(\mathrm{aq})$

$2 \mathrm{Na}(\mathrm{s})+\mathrm{Br}_{2}(\mathrm{l}) \rightarrow 2 \mathrm{NaBr}(\mathrm{s})$

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