Meaning Of Words 4.0 / 5 based on 1 rating ? ChemistryNational 5SQA Created by: Maddie WattCreated on: 26-11-12 21:58 ELEMENT Substance containing only ONE type of atom. 1 of 16 COMPOUND A substance made when 2 or more elements join together. 2 of 16 PRECIPITATE A solid substance that comes out of a solution during a chemical reaction. 3 of 16 EXOTHERMIC//ENDOTHERMIC EXOTHERMIC: Reaction that gives out energy ENDOTHERMIC: Reaction that takes in energy 4 of 16 CATALYST Speeds up chemical reaction, but DOES NOT GET USED UP. Can be recovered afterward and will be chemically unchanged. 5 of 16 ENZYME BIOLOGICAL catalyst (does the same as normal but in a living thing) 6 of 16 GROUPS ON PERIODIC TABLE HALOGENS (group 1) ALKALI METALS (group 7) NOBLE GASES (group 0) TRANSITION METALS (block in centre) 7 of 16 ATOMIC NUMBER number of protons and electrons in atom 8 of 16 MASS NUMBER protons + neutrons 9 of 16 ISOTOPE atoms of same element but with different number of neutrons 10 of 16 IONS atoms after they have gained or lost an electron(s) 11 of 16 DIATOMIC MOLECULES contain TWO atoms 12 of 16 COVALENT BOND bond where 2 atoms share electrons (single covalent bond is sharing two electrons, double is four etc) 13 of 16 CHEMICAL FORMULA gives number of atoms of each element present in in substance eg 14 of 16 FUEL substance that burns thus releasing energy 15 of 16 FRACTION group of substances with similar boiling points (crude oil) 16 of 16
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