chemical reactions 0.0 / 5 ? ChemistryReactionsA2/A-levelNone Created by: maya808Created on: 10-05-14 13:05 how do you know a chemical reaction has occurred? when substances react and new chemicals have been made 1 of 7 what two things can we use to help make some reactions work? heat and electricity 2 of 7 how can you tell a chemical reaction has occurred? if there is a colour change or when a gas is given off? 3 of 7 what is oxidation? when when oxygen is added onto a substance 4 of 7 what is reduction? when oxygen is removed from a substance. 5 of 7 what is thermal decomposition? when a compound is broken down using heat? 6 of 7 what is neutralisation? when an acid reacts with and alkali? 7 of 7
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