Chapter 1: Chemical Reactions and Equations

Why should a magnesium ribbon be cleaned before burning in air?

Hint: Think about what forms on the surface of magnesium when it is exposed to air.

Write the balanced equation for the following chemical reactions:

1. Hydrogen + Chlorine → Hydrogen chloride
2. Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride
3. Sodium + Water → Sodium hydroxide + Hydrogen

Write a balanced chemical equation with state symbols for the following reactions:

1. Solutions of barium chloride and sodium sulphate in water react to give insoluble barium sulphate and the solution of sodium chloride.
2. Sodium hydroxide solution (in water) reacts with hydrochloric acid solution (in water) to produce sodium chloride solution and water.