Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The same volumes and concentrations of dilute hydrochloric acid and aqueous sodium hydroxide are combined. The temperatures of the solutions are given below. Dilute hydrochloric acid: $26~^\circ\text{C}$ Aqueous sodium hydroxide: $26~^\circ\text{C}$ Mixture of dilute hydrochloric acid and aqueous sodium hydroxide: $33~^\circ\text{C}$ Which statement describes the reaction?

  • AEnergy is released and the products have less energy than the reactants.
  • BEnergy is released and the products have more energy than the reactants.
  • CEnergy is absorbed and the products have less energy than the reactants.
  • DEnergy is absorbed and the products have more energy than the reactants.

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