CHemistry unit 1 key words 0.0 / 5 ? Chemistrykey words for unit1ASOCR Created by: Vicky FursdonCreated on: 21-02-14 10:56 Definition of an isotopes An atom of the same element with a different number of neutrons and Relative atomic mass 1 of 18 Define Relative Atomic mass The mean mass of an atom of an element compared to 1/12th of the mass of an atom of carbon-12 2 of 18 Define Relative isotopic mass The mean mass of an isotopes of an element relative to 1/12th of the mass of an atom ofcarbon-12 3 of 18 Define Relative Formula mass The mean mass of a formula unit compound relative to 1/12th of the mass of an atom of carbon-12 4 of 18 Define Relative molecular mass The mean mass of a molecule relative to 1/12th of the mass of an element of carbon-12 5 of 18 Define dilute A small amount of solute in a large quantity of solvent 6 of 18 Define concentrated A large amount of solute in a small quantity of solvent 7 of 18 Define Anhydrous Without water of crystalisation 8 of 18 Define hyrous With water of crystallisation 9 of 18 Water of crystallisation The water molecules which form an essential part of a crystal ion structure of a compound 10 of 18 First ionisation energy The energy required to remove one electron from one mole of a gaseous atom 11 of 18 Successive ionisation energy: The energy required to remove one (to infinity) from one mole of a gaseous uni positive ions to form gaseous di-positive ions 12 of 18 Ionic compound Electostatic atrraction between oppositely charged ions 13 of 18 Covalent bond Shared pair of electron 14 of 18 Electronegativity The ability of an atom to attract the bonding electrons in a covalent bond 15 of 18 Metalic bonding The attraction between positive ions and delocalised electrons 16 of 18 Oxidation The loss of an electron, increase in oxidation number 17 of 18 Reduction The gaining of an electron, decrease in oxidation number 18 of 18
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