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5.2 Controlling reactions

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Question 21

A solid reactant, W, is made into four cuboid pellets. Each pellet has a volume of 12 cm312\,\mathrm{cm^{3}}12cm3.

Each pellet is fully exposed to oxygen in a separate reaction vessel. The temperature and oxygen pressure are the same in each vessel.

PelletDimensions
P1 cm×2 cm×6 cm1\,\mathrm{cm} \times 2\,\mathrm{cm} \times 6\,\mathrm{cm}1cm×2cm×6cm
Q1 cm×3 cm×4 cm1\,\mathrm{cm} \times 3\,\mathrm{cm} \times 4\,\mathrm{cm}1cm×3cm×4cm
R2 cm×2 cm×3 cm2\,\mathrm{cm} \times 2\,\mathrm{cm} \times 3\,\mathrm{cm}2cm×2cm×3cm
S0.5 cm×4 cm×6 cm0.5\,\mathrm{cm} \times 4\,\mathrm{cm} \times 6\,\mathrm{cm}0.5cm×4cm×6cm

Which pellet has the lowest rate of reaction at the start?

[1]
A

Pellet P

B

Pellet R

C

Pellet S

D

Pellet Q

Markscheme

5.2 Controlling reactions Questions

  1. GCSE
  2. /Chemistry
  3. /5.2 Controlling reactions

122 exam-style questions on OCR GCSE Chemistry 5.2 Controlling reactions, covering 5.2.1 Measuring and interpreting rate of reaction, 5.2.2 Factors affecting rate and collision theory, and 5.2.3 Catalysts, activation energy and enzymes. Each one has a worked solution and a mark scheme showing where the marks go.

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