Chemistry Key Terms 4.5 / 5 based on 2 ratings ? ChemistryAllGCSEEdexcel Created by: Emilyy11Created on: 22-04-14 16:24 Diffusion The spreading out of particles in a gas or liquid. 1 of 23 Isotope Atoms that have the same atomic number, but different mass numbers (same protons, different electrons). 2 of 23 Covalent bonding A pair(s) of electrons is shared between two atoms. 3 of 23 Oxidation Gain of oxygen, loss of electrons. 4 of 23 Reduction Loss of oxygen, gain of electrons. 5 of 23 Ionic bonding Bonding in which there is a transfer of electrons from one atom to another to produce ions. 6 of 23 Metallic bonding An array of positive ions in a 'sea' of delocalised electrons. 7 of 23 Catalyst A substance that speeds up a chemical reaction but is not used up. 8 of 23 Acid rain water and oxygen in the atmosphere react with sulfur dioxide to produce sulfuric acid, or with various oxides of nitrogen. 9 of 23 Electrolysis A chemical change caused by passing an electric current through a compound which is either molten or in solution. 10 of 23 Electrolyte A substance that undergoes electrolysis. 11 of 23 Anode The positive electrode. 12 of 23 Cathode The negative electrode. 13 of 23 Exothermic A reaction that gives out heat. 14 of 23 Endothermic A reaction that absorbs energy (often heat). 15 of 23 Reversible reaction A reaction where the products of the reaction can react to produce the original reactants. 16 of 23 Rusting Iron rusts in the presence of oxygen and water. 17 of 23 Hydrocarbon A compound of carbon and hydrogen only. 18 of 23 Homologous series A family of compounds with similar properties because they have similar bonding. 19 of 23 Alkane A saturated hydrocarbon. 20 of 23 Alkene An unsaturated hydrocarbon, 21 of 23 Cracking Large hydrocarbon molecules are broken down into smaller ones. 22 of 23 Polymerisation The joining of many monomers to make a polymer, 23 of 23
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