Experiments to measure the rate of reaction
2 marks · NormalState two safety precautions you should take when performing an experiment to measure the rate of reaction between marble chips and hydrochloric acid.
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Also accept: Wear eye protection/goggles; Avoid skin contact with acid; Wear gloves; Tie back long hair; Use cotton wool to prevent spitting
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Marking points
B1 · 1 mark · States one valid safety precaution (e.g., wears eye protection).
B2 · 1 mark · States a second valid precaution (e.g., avoids skin contact with acid).
Worked solution
1. Wear safety goggles (eye protection). 2. Avoid skin contact with the acid (wear gloves or handle carefully).