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CAIE A-Level Chemistry AS 8.1.1 Terms Rate of Reaction Frequency of Collisions Questions

Practise defining rate of reaction and explaining how collision frequency and effective collisions determine reaction rate using CAIE 9701 AS questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Define rate of reaction and explain that reaction rate depends on the frequency of successful collisions between reacting particles.

CAIE A-Level Chemistry AS 8.1.1 Terms Rate of Reaction Frequency of Collisions Questions question 1

[Maximum number: 1]

A student carries out four experiments to investigate the rate of reaction between 3.0 g of calcium carbonate and hydrochloric acid.

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

experiment 1CaCO31 \quad \mathrm{CaCO}_{3} powder +2.0moldm−3HCl+2.0 \mathrm{moldm}^{-3} \mathrm{HCl} at 35∘C35^{\circ} \mathrm{C}
experiment 2CaCO32 \mathrm{CaCO}_{3} powder +2.0moldm−3HCl+2.0 \mathrm{moldm}^{-3} \mathrm{HCl} at 35∘C35^{\circ} \mathrm{C}
experiment 3 large chips of CaCO3+1.0moldm−3HCl\mathrm{CaCO}_{3}+1.0 \mathrm{moldm}^{-3} \mathrm{HCl} at room temperature
experiment 4 large chips of CaCO3+1.0moldm−3HCl\mathrm{CaCO}_{3}+1.0 \mathrm{moldm}^{-3} \mathrm{HCl} at 35∘C35^{\circ} \mathrm{C}

The student collects the CO2( g)\mathrm{CO}_{2}(\mathrm{~g}) and times how long it takes to produce the same volume of gas for each experiment.

What could be the correct times for the four experiments?

experiment 1 /s

experiment 2 /s

experiment 3 /s

experiment 4 /s

5

10

30

95

5

10

95

30

5

30

95

10

95

30

10

5

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