Chemistry 5070 · O Level · Exothermic and endothermic reactions

Exothermic and endothermic reactions — practice question

Which change absorbs heat from its surroundings?

  • A$\text{CH}_4(g) + 2\text{O}_2(g) \rightarrow \text{CO}_2(g) + 2\text{H}_2\text{O}(l)$
  • B$\text{H}(g) + \text{Cl}(g) \rightarrow \text{HCl}(g)$
  • C$\text{H}_2\text{O}(g) \rightarrow 2\text{H}(g) + \text{O}(g)$
  • D$\text{H}_2\text{O}(l) \rightarrow \text{H}_2\text{O}(s)$

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