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CAIE IGCSE Chemistry Concentration Temperature Surface Area and Catalysts

CAIE IGCSE Chemistry Concentration Temperature Surface Area and Catalysts
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise predicting how concentration, pressure, surface area, temperature or a catalyst changes rate and sketching the corresponding progress curve.

How this is tested

  • predict faster rate from greater concentration, pressure, surface area or temperature
  • state that adding a catalyst increases rate while removing it decreases rate
  • sketch a steeper progress curve that reaches the same final amount when only rate changes

Question 3(d)

[Maximum number: 2]

The symbol equation for the industrial production of ammonia is shown.

N2( g)+3H2( g)⇌2NH3( g)ΔH=−90 kJ/mol\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) \quad \Delta H=-90 \mathrm{~kJ} / \mathrm{mol}

State two methods of increasing the rate of this reaction.

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Figure for Question 3(d) — CAIE IGCSE Chemistry
Figure for Question 3(d) — CAIE IGCSE Chemistry