A student investigates the rate of reaction when zinc reacts with dilute hydrochloric acid, HCl(aq).
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
The student uses the following method.
Step 1 Accurately weigh 1.00 g of zinc foil.
Step 2 Add 50 cm³ of 2.00 moldm⁻³ HCl(aq) to a conical flask.
Step 3 Add the zinc foil to the 50cm³ of HCl(aq) in the flask and immediately start a timer.
Step 4 Stop the timer when 20.0cm³ of H₂(g) has been collected.
Step 5 Repeat Steps 1 to 4 using lower concentrations of HCl(aq).

Q: What topic does this question test?

This question tests Reaction kinetics in A-Level Chemistry (syllabus code 9701). It is worth 16 marks.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2023 examination, Paper 5 Variant 2 (9701_w23_qp_52.pdf).

Question

A student investigates the rate of reaction when zinc reacts with dilute hydrochloric acid, HCl(aq).
Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)
The student uses the following method.
Step 1 Accurately weigh 1.00 g of zinc foil.
Step 2 Add 50 cm³ of 2.00 moldm⁻³ HCl(aq) to a conical flask.
Step 3 Add the zinc foil to the 50cm³ of HCl(aq) in the flask and immediately start a timer.
Step 4 Stop the timer when 20.0cm³ of H₂(g) has been collected.
Step 5 Repeat Steps 1 to 4 using lower concentrations of HCl(aq).

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