Contents
Return after a break
What can you recall?
identify
Recall and explain
Supplement. Pupils plan how to follow the rate of a reaction that makes a gas. Which row gives a plan that will work well?
identify: name or select.
| Row | Gas made in total | How the pupil follows it |
|---|---|---|
| A | about 50 cm³ (0.004 g) of hydrogen | loss of mass, on a balance that reads to 0.01 g |
| B | about 270 cm³ (0.50 g) of carbon dioxide | volume, in a 100 cm³ gas syringe |
| C | about 270 cm³ (0.50 g) of carbon dioxide | loss of mass, on a balance that reads to 0.01 g |
| D | about 270 cm³ (0.50 g) of carbon dioxide | loss of mass, on a balance that reads to 1 g |
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Scope and sources
Cambridge IGCSE Chemistry 0620 · 2026–2028 v2 · Original learning materials.
Rate of reaction (6.2 Core 1–4, Supplement 5–8): the effect of concentration, gas pressure, surface area, temperature and a catalyst, catalysts and enzymes, practical methods for following a rate and interpreting its data, collision theory and activation energy. Moles and gas volumes are in an earlier module; reversible reactions and equilibrium in 6.3.
Apparatus, amounts and times in the experiment are illustrative. Real practical work follows a teacher-approved safety method.
Official Cambridge syllabus