Chemistry 0620 · IGCSE · Reactivity series

Reactivity series — practice question

When calcium metal is added to water, it forms a solution of calcium hydroxide and releases hydrogen gas. Which equation is correct?

  • A$\text{Ca}(s) + \text{H}_2\text{O}(aq) \rightarrow \text{CaOH}(aq) + \text{H}(g)$
  • B$\text{Ca}(s) + 2\text{H}_2\text{O}(aq) \rightarrow \text{Ca(OH)}_2(s) + 2\text{H}_2(g)$
  • C$\text{Ca}(s) + 2\text{H}_2\text{O}(l) \rightarrow \text{Ca(OH)}_2(aq) + \text{H}_2(g)$
  • D$\text{Ca}(s) + \text{H}_2\text{O}(l) \rightarrow \text{CaOH}(l) + \text{H}(g)$

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI