Science Revision 0.0 / 5 ? FunFunNone Created by: lilmeepster123Created on: 29-03-14 11:27 What is needed to join two elements and form a compound? A chemical reaction 1 of 10 How do you define a chemical reaction? A new substance is created, energy changes happen or colour changes can all prove a chemical reaction occurred 2 of 10 True or False: after a chemical reaction, the mass of the substances is the same True- mass is conserved as they are the same atoms 3 of 10 What is oxidation? Give an example Joining oxygen with a substance. Iron + Water + oxygen ---> hydrated iron oxide (rust) 4 of 10 What is exothermic and endothermic energy? exothermic gives out heat energy and endothermic absorbs heat energy 5 of 10 What is reduction? removing oxygen from a substance. Happens in smelting or getting metal from an ore 6 of 10 Thermal Decomposition- what is it? breaking down a substance by heating it. e.g.- copper carbonate + heat ---> copper oxide + carbon dioxide 7 of 10 What is Electrolysis? using electricity to break down a compound. 8 of 10 What are the products of burning (combustion)? hydrocarbons burn to give carbon dioxide and water. 9 of 10 What are the tests for carbon dioxide and water? water makes anhydrous copper sulphate blue and carbon dioxide turns limewater milky 10 of 10
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