Chemistry 0.0 / 5 ? ChemistryKey WordsIGCSEEdexcel Created by: o.skiCreated on: 13-05-17 20:44 Element A substance that cannot be broken down into simpler substances 1 of 19 Compound 2 or more elements chemically combined 2 of 19 Isotopes Different atoms of the same element with the same number of protons and different number of neutrons 3 of 19 Atomic Number Number of protons 4 of 19 Ions Charged particles which are formed when atoms lose or gain electrons 5 of 19 Ionic Bonding A strong electrostatic attraction between oppositely charged ions 6 of 19 Covalent bonding A strong electrostatic attraction between a shared pair of electrons and the nuclei of the atoms involved in the bond 7 of 19 Metallic bonding A strong electrostatic attraction between a lattice of positive ions and a sea of delocalised electrons 8 of 19 Intermolecular Force A weak attraction between separate covalent molecules 9 of 19 Relative Atomic Mass the average mass of the isotope of an element relative to the mass of 1/12 of an atom ion carbon 12 10 of 19 Relative Molecular Mass The sum of the relative atomic masses of the atoms making up a molecule 11 of 19 Empirical Formula Shows the simplest whole number ratio of the elements present 12 of 19 Molecular Formula Shows the total number of atoms of each element present in a molecule of the compound 13 of 19 Activation Energy The minimum amount of energy required for successful collisions to occur 14 of 19 Catalyst A substance that speeds up a reaction, without changing itself by providing an alternative pathway of lower activation energy 15 of 19 Rusting A redox action-hydrated iron(iii) oxide 16 of 19 Cracking Long chain alkanes which are changed into shorter chain alkanes and alkenes 17 of 19 Homologous Series Series of compounds with the same functional group, where each member differs from the next by CH2-they have similar chemical properties 18 of 19 Isomers Compounds with the same molecular formula but different structural formula 19 of 19
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