May/June 2026 Paper 23

2026 · 40 questions · 40 parts · 40 marks

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1Enthalpy Changes Energy Profiles CalorimetryMedium1 mark
Gaseous ammonia reacts with an excess of gaseous hydrogen chloride in a sealed flask.
The reaction is exothermic. Which statements about the reaction are correct?
  1. 1
    The number of gas particles in the flask decreases.
  2. 2
    The average kinetic energy of the gas particles increases.
  3. 3
    The activation energy of the reaction increases.