Chemical Reactions and Equations Quiz

Which of the statements about the reaction below are incorrect? 2PbO(s) + C(s) → 2Pb(s) + CO2(g)

• Carbon is getting reduced.

• Carbon is getting oxidised.

• Carbon dioxide is getting oxidised.

• Lead is getting reduced.

Fe2O3 + 2Al → Al2O3 + 2Fe The above reaction is an example of a

• combination reaction.

• double displacement reaction.

• decomposition reaction.

• displacement reaction.

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?

• (a) Hydrogen gas combines with nitrogen to form ammonia.

• (b) Hydrogen sulphide gas burns in air to give water and sulpur 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.

Translate the following statements into chemical equations and then balance them. (a) Hydrogen gas combines with nitrogen to form ammonia.

• (d) Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

• (c) Barium chloride reacts with aluminium sulphate to give aluminium chloride and a precipitate of barium sulphate.

• (b) Hydrogen sulphide gas burns in air to give water and sulpur dioxide.

• (a) Hydrogen gas combines with nitrogen to form ammonia.

Balance the following chemical equations. (a) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O

• (a) HNO3 + Ca(OH)2 → Ca(NO3)2 + H2O

• (b) NaOH + H2SO4 → Na2SO4 + H2O

• (c) NaCl + AgNO3 → AgCl + NaNO3

• (d) BaCl2 + H2SO4 → BaSO4 + HCl

Write the balanced chemical equations for the following reactions. (a) Calcium hydroxide + Carbon dioxide → Calcium carbonate + Water

• (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

Write the balanced chemical equation for the following and identify the type of reaction in each case. (a) Potassium br.

• (a) Potassium br.

• (c) Potassium br.

• (d) Potassium br.

• (b) Potassium br.

Recall Activity 1.1, where a magnesium ribbon burns with a dazzling flame in air (oxygen) and changes into a white substance, magnesium oxide. Is magnesium being oxidised or reduced in this reaction?

• Reduced

• Oxidised

• Cannot be determined

• Neither oxidised nor reduced

What is corrosion?

• The process of metal losing hydrogen

• The process of metal reacting with substances around it

• The process of metal losing oxygen

• The process of metal gaining oxygen