C2- how much?

PRACTICE ALL MATHS METHODS ON PAPER

reversible reactions

• if the products of a chemical reaction can react to produce the reactants then the reaction is reversible
•  this is the sign used
• eg ammonium chlorideammonia+ chlorine

analysing substances

• substances added to food to enhance their qualities are called adatives they may be natural or synthetic
• food can be checked by chemical analysis to ensure only safe, permitted addatives are used
• these methods can be paper chromotography and mass spectrometry
• in paper chromotography a colour is…