Science
Translate the following statements into chemical equations and then balance them.
(a) Hydrogen gas combines with nitrogen to form ammonia.
(b) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.
(c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.
(d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.
Chemical Equation
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Answer
(i) 3H2 (g) + N2 (g) ⟶ 2NH3 (g)
(ii) 2H2S (g) + 3O2 (g) ⟶ 2H2O (l) + 2SO2 (g)
(iii) 3BaCl2 (aq) + Al2(SO4)3 (aq) ⟶ 2AlCl3 (aq) + 3BaSO4 (s)
(iv) 2K (s) + 2H2O (l) ⟶ 2KOH (s) + H2 (g)
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What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.
- Hydrogen gas and iron chloride are produced.
- Chlorine gas and iron hydroxide are produced.
- No reaction takes place.
- Iron salt and water are produced.
What is a balanced chemical equation? Why should chemical equations be balanced?
Balance the following chemical equations.
(a) HNO3 + Ca(OH)2 ⟶ Ca(NO3)2 + H2O
(b) NaOH + H2SO4 ⟶ Na2SO4 + H2O
(c) NaCl + AgNO3 (aq) ⟶ AgCl + NaNO3
(d) BaCl2 + H2SO4 ⟶ BaSO4 + HCl
Write the balanced chemical equations for the following reactions.
(a) Calcium hydroxide + Carbon dioxide ⟶ Calcium carbonate + Water
(b) Zinc + Silver nitrate ⟶ Zinc nitrate + Silver
(c) Aluminium + Copper chloride ⟶ Aluminium chloride + Copper
(d) Barium chloride + Potassium sulphate ⟶ Barium sulphate + Potassium chloride