Edexcel IGCSE Chemistry Investigation Planning Methods

Practise Edexcel IGCSE Chemistry investigation planning by choosing apparatus, extending methods and explaining safe experimental choices.

Exam points

Extend an investigation by repeating it with different substances to test a deduction.
Choose suitable apparatus such as conical flasks and measuring cylinders for practical work.
Explain safety choices, including lids, cotton wool, goggles, fume cupboards and avoiding flames.

Covered syllabus points

Devise and plan investigations Safe and appropriate experimental methods

[Maximum number: 1]

A student uses this apparatus to investigate the effect of heat on different solid metal carbonates.

Figure for Question Investigation planning and methods question 1 — Edexcel IGCSE Chemistry

This is the student's method.
- use a spatula to put some metal carbonate in the boiling tube
- fit the delivery tube into position
- pour some limewater into the test tube
- start a timer and immediately begin to heat the metal carbonate
- record the time when a change first occurs in the limewater

The student repeats the method using different metal carbonates.
When a metal carbonate is heated a reaction sometimes occurs.
The equation for the reaction is

metal carbonate → metal oxide + carbon dioxide

State how you should extend the investigation to see if your deduction is correct.

[Maximum number: 1]

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

Figure for Question Investigation planning and methods question 2 — Edexcel IGCSE Chemistry

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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Covered syllabus points

Investigation planning and methods question 1

Investigation planning and methods question 2