Edexcel IGCSE Chemistry Safe and Appropriate Experimental Methods Questions

Practise Edexcel IGCSE Chemistry safe experimental methods by choosing apparatus, preventing splashes and explaining safety precautions.

Exam points

Name suitable apparatus such as a conical flask or measuring cylinder for a practical method.
Explain containment choices such as a lid or cotton wool to reduce loss or splashing.
Link safety precautions to hazards, such as toxic chlorine, corrosive acid or flammable liquids.

[Maximum number: 1]

A student uses this apparatus to investigate the rate of reaction between marble chips and dilute hydrochloric acid.

The equation for the reaction is

\mathrm{CaCO}_{3}+2 \mathrm{HCl} \rightarrow \mathrm{CaCl}_{2}+\mathrm{H}_{2} \mathrm{O}+\mathrm{CO}_{2}

During the reaction the mass of the contents of the flask decreases.

State the purpose of the cotton wool.

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