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Edexcel IGCSE Chemistry 3.15 Surface Area and Concentration Rate Practical Questions

Practise rate-practical questions by plotting mass loss, explaining graph shape and controlling marble chip and acid variables.

Syllabus
First assessment 2019
Course
Chemistry 4CH1

Exam points

  • Plot mass-loss data and draw a best-fit curve that starts at the origin and levels off.
  • Explain curve shape using acid concentration decreasing as marble chips react.
  • Control mass and surface area of marble chips, acid volume and acid concentration.

Edexcel IGCSE Chemistry 3.15 Surface Area and Concentration Rate Practical Questions question 1

[Maximum number: 2]

A student uses this apparatus to investigate the rate of reaction between marble chips and dilute hydrochloric acid.

Figure for Question Edexcel IGCSE Chemistry 3.15 Surface Area and Concentration Rate Practical Questions question 1 — Edexcel IGCSE Chemistry

This is the equation for the reaction.

CaCO3( s)+2HCl(aq)→CaCl2(aq)+H2O(l)+CO2( g)\mathrm{CaCO}_{3}(\mathrm{~s})+2 \mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{CaCl}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{CO}_{2}(\mathrm{~g})

Question (a)

(a)

Give a reason why the reading on the balance decreases during the reaction.

[ 1 ]

Question (b)

(b)

After 10 minutes, the reaction stops even though there are marble chips remaining.

Give a reason why the reaction stops.

[ 1 ]
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