Chemistry 0620 · IGCSE · Rate of reaction

Rate of reaction — practice question

When calcium carbonate is added to dilute hydrochloric acid, bubbles of carbon dioxide are produced. If the temperature is raised, this reaction happens more quickly. Which row gives the correct explanation for this observation?

  • Acollision rate increases; number of molecules with sufficient energy to react is more
  • Bcollision rate increases; number of molecules with sufficient energy to react is the same
  • Ccollision rate stays the same; number of molecules with sufficient energy to react is more
  • Dcollision rate stays the same; number of molecules with sufficient energy to react is the same

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