Reversible reactions - Reversible reactions - AQA - GCSE Combined Science Revision - AQA Trilogy - BBC Bitesize

Reversible reactionsIn some chemical reactions, the of the reaction can react together to produce the original . These reactions are called . They can be represented in the following way:A + B ⇌ C + DThe symbol ⇌ has two half arrowheads, one pointing in each direction. It is used in equations that show reversible reactions:the forward reaction is the one that goes to the right the backward reaction is the one that goes to the leftThe reaction mixture may contain reactants and products, and their proportions may be changed by altering the reaction conditions.ExampleAmmonium chlorideAmmonium chloride is a white solid. It breaks down when heated, forming ammonia and hydrogen chloride. When these two gases are cool enough, they react together to form ammonium chloride again.This reversible reaction can be modelled as:ammonium chloride ⇌ ammonia + hydrogen chlorideNH4Cl(s) ⇌ NH3(g) + HCl(g)QuestionWrite the for the forward reaction in the breakdown of ammonium chloride.Energy changes in rev...