Chemistry 0620 · IGCSE · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

The equation for the reaction of gaseous hydrogen with gaseous iodine to produce gaseous hydrogen iodide is shown: $\text{H}_2(g) + \text{I}_2(g) \rightarrow 2\text{HI}(g)$ This reaction is exothermic. Which statement accounts for the fact that the reaction is exothermic?

  • AEnergy is released when H-H and I-I bonds are broken.
  • BThe bond energies of the reactants are larger than the bond energies of the products.
  • CThe products are at a higher energy level than the reactants.
  • DMore energy is released when two HI bonds are formed than is used when the H-H and I-I bonds are broken.

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