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Rates of reaction

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Question 75

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]

Rates of reaction Questions

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

Practise Edexcel GCSE Chemistry Rates of reaction with exam-style questions for Foundation and Higher tier. 166 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

Question bank