Chemistry 0620 · IGCSE · Physical and chemical changes

Physical and chemical changes — practice question

Two equations are given. reaction 1: $\text{CaCO}_3 \rightarrow \text{CaO} + \text{CO}_2$ reaction 2: $\text{CaO} + \text{H}_2\text{O} \rightarrow \text{Ca(OH)}_2$ Which terms are used for reactions 1 and 2?

  • Areaction 1: reduction; reaction 2: hydration
  • Breaction 1: reduction; reaction 2: hydrolysis
  • Creaction 1: thermal decomposition; reaction 2: hydration
  • Dreaction 1: thermal decomposition; reaction 2: hydrolysis

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