Chemistry

1. a substance made up of two or more different elements chemically joined together
2. a neutral particle made up of protons, neutrons and electrons
5. the amount of product made in a reaction
7. a physical method used to separate an insoluble solid from a liquid
8. the central part of an atom, made up of protons and neutrons
10. a substance that reacts with acids in neutralisation reactions
12. an indicator that’s pink in alkalis and colourless in acids

1. an exothermic reaction between a fuel and oxygen
3. the process of breaking down a substance using electricity
4. a substance with a pH of less than 7 that forms H+ ions in water
6. a charged particle formed when one or more electrons are lost or gained by an atom
9. the amount by which a given result may differ from the true value
11. a substance with a pH more than 7 that forms OH- ions in solution