Chemistry 0620 · IGCSE · Physical and chemical changes

Physical and chemical changes — practice question

Calcium nitrate breaks down when heated. What is the equation for the thermal decomposition of calcium nitrate?

  • A$2\text{Ca(NO}_3\text{)}_2 \rightarrow 2\text{CaO} + \text{O}_2 + 4\text{NO}_2$
  • B$\text{Ca(NO}_3\text{)}_2 \rightarrow \text{Ca(NO}_2\text{)}_2 + \text{O}_2$
  • C$\text{Ca(NO}_3\text{)}_2 \rightarrow \text{Ca} + \text{O}_2 + 2\text{NO}_2$
  • D$\text{Ca(NO}_3\text{)}_2 \rightarrow \text{Ca} + 3\text{O}_2 + \text{N}_2$

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