Chemistry Key Words 0.0 / 5 ? ChemistryKey WordsIGCSEEdexcel Created by: Lucyjane98Created on: 06-05-15 17:35 Activation Energy Minimum amount of energy needed to start reaction 1 of 27 Alkane Saturated hydrocarbon - CnH2n+2 2 of 27 Alkene Unsaturated hydrocarbon with a double bond - CnH2n 3 of 27 Anhydrous A mixture not containing water 4 of 27 Aqueous solution Mixture made by soluble substance being added to water 5 of 27 Atom The smallest part of an element 6 of 27 Base The oxide, hydroxide or carbonate of a metal that will react with an acid, forming a salt as one of the products 7 of 27 Catalyst A substance that speeds up a chemical reaction but remains chemically unchanged 8 of 27 Compound A substance made when two or more elements are chemically bonded together 9 of 27 Covalent Bond The attraction between 2 atoms that share one or more pairs of electrons 10 of 27 Distillation Separation of a liquid from a mixture by evaporation followed by condensation. 11 of 27 Electrolysis The breakdown of a substance containing ions by electricity. 12 of 27 Element A substance made up of only 1 type of atom. An element cannot be broken down chemically into any simpler substances. 13 of 27 Endothermic A reaction that takes in energy from the surroundings. 14 of 27 Equilibrium The point in a reversible reaction in which the forward and backwards rates of reaction are the same. Constant 15 of 27 Exothermic A reaction that gives out energy into the surroundings. 16 of 27 Fractional Distillation Separation of many substances in a mixture by heating, using the fact that they have different boiling points. 17 of 27 Giant Covalent Bond A structure with many atoms joined to each other by lots of strong, covalent bonds 18 of 27 Ion A charged particle 19 of 27 Isotope Same atomic number different mass number 20 of 27 Mass number The sum of the number of neutrons and protons in an atomic nucleus. 21 of 27 Mixture A substance consisting of two or more substances mixed together 22 of 27 Molecule Two or more atoms held together by covalent bonds. 23 of 27 Product A chemical substance formed as a result of a chemical reaction. 24 of 27 Relative formula mass The sum of the relative atomic masses of the elements as given in the formula for any non-molecular compound. 25 of 27 Salt A compound formed by replacing hydrogen in an acid by a metal 26 of 27 VIscosity A measure of a fluid's thickness or resistance to flow. 27 of 27
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