Chemical Formulae, Equations and Calculations Part 1

2 marks · Hard

Write the balanced chemical equation, including state symbols, for the reaction of solid sodium with water to form aqueous sodium hydroxide and hydrogen gas.

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2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)

Also accept: 2Na(s)+2H2O(l)->2NaOH(aq)+H2(g)

Common mistakes: 2Na(s) + 2H2O(l) → 2NaOH(s) + H2(g); Na(s) + H2O(l) → NaOH(aq) + H2(g)

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Marking points

M1 · 1 mark · Writes the correct reactants and products with correct formulae and state symbols.

A1 · 1 mark · Balances the equation correctly: 2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g).

Worked solution

Solid sodium reacts with liquid water to produce aqueous sodium hydroxide and hydrogen gas.