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8.1 Rates of reaction

8.1 Rates of reaction

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Question 44

Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas.

A student wants to investigate the effect of temperature on the rate of this reaction.

The student used the following method:

  • Step 1: Pour 40 cm3 of dilute hydrochloric acid into a boiling tube.
  • Step 2: Warm the acid in a water bath until its temperature reaches 20 ∘C20\text{ }^\circ\text{C}20 ∘C.
  • Step 3: Add a 3 cm strip of zinc ribbon to the acid.
  • Step 4: Immediately start a stopwatch.
  • Step 5: Measure the time taken for the zinc ribbon to completely disappear.
  • Step 6: Repeat steps 1–5 at 40 ∘C40\text{ }^\circ\text{C}40 ∘C and 60 ∘C60\text{ }^\circ\text{C}60 ∘C.

The student kept the volume of hydrochloric acid the same in each experiment.

State two other variables that should be kept the same.

[2]
Markscheme

8.1 Rates of reaction Questions

  1. GCSE
  2. /Chemistry
  3. /8.1 Rates of reaction

127 exam-style questions on Edexcel GCSE Chemistry 8.1 Rates of reaction, covering 8.1.1 Measuring and interpreting rates of reaction, 8.1.2 Collision theory and the factors affecting rate, and 8.1.3 Catalysts and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.

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