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CAIE IGCSE Chemistry 6.2.1 Rate Changes Caused By Concentration Questions

Interpret rate experiments and progress curves, and explain how concentration, pressure, surface area, temperature and catalysts affect successful collisions.

Syllabus
2026–2028
Course
Chemistry 0620

Exam points

  • predict faster rate from greater concentration, pressure, surface area or temperature
  • explain rate changes using collision frequency and successful collisions
  • state how catalysts change rate by providing an alternative pathway
  • interpret progress curves using gradient, initial rate, plateau and final amount

CAIE IGCSE Chemistry 6.2.1 Rate Changes Caused By Concentration Questions question 1

[Maximum number: 1]

Powdered magnesium carbonate is added to excess dilute hydrochloric acid.
The total volume of gas produced is measured over time.
A graph of the results is shown.

Figure for Question CAIE IGCSE Chemistry 6.2.1 Rate Changes Caused By Concentration Questions question 1 — CAIE IGCSE Chemistry

The experiment is repeated but the concentration of the hydrochloric acid is doubled.

All other conditions are kept the same.
Which statements about the second experiment are correct?

1 The final volume of gas is 360 cm3360 \mathrm{~cm}^{3}.
2 The reaction finishes before 90 seconds.
3 The activation energy of the reaction is lower.

A

1 and 2

B

1 and 3

C

2 and 3

D

2 only

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