AS Chemistry Unit 1 Key Words 0.0 / 5 ? ChemistryThe Periodic TableCalculationsReactionsASOCR Created by: IAmGreenoCreated on: 04-10-15 16:24 Relative Isoptopic Mass It is the mass of an isotope of an element compared to one twelfth mass of Carbon-12 1 of 18 Relative Atomic Mass It is the mean weighted mass of an atom of an element compared with one twelfth mass of Carbon-12 2 of 18 Relative Formula Mass Is the relative mass of a formula compared with one twelfth mas Carbon-12, usually used for ionic compounds or giant covalent 3 of 18 Relative Molecular Mass It is the relative mass of a molecule compared with one twelfth mass Carbon-12, usually used for covalent molecules 4 of 18 Avogadro Constant The number of particles per mole of substance, 6.02 x10^23 5 of 18 Molar Mass The mass per mole of a substance, measured in g/mol 6 of 18 Empirical Formula The most simple way of writing a formula 7 of 18 24000cm3 or 24dm3 The volume that one mole of gas occupies at RTP 8 of 18 Ideal Gas Equation pV=nRT 9 of 18 Gas Constant 8.31 JK-1 Mol-1 10 of 18 Define a Salt Any chemical compound formed from an acid when a H+ ion from an acid has been replaced by a metal ion or another positive ion eg, NH4 (Ammonium) 11 of 18 Cation A positively charged ion, eg Mg2+ 12 of 18 Anion A negatively charged ion eg Cl- 13 of 18 Hydrated Compound Refers to a crystalline compound containing water molecules 14 of 18 Anhydrous Compound Refers to a compound containing no water molecules 15 of 18 Water of Crystallisation Refers to the water molecules which make a key part of the crystalline structure of a compound 16 of 18 Atom Economy It is a measure of the efficiency of a reaction which focuses on the amount of waste product produced 17 of 18 Percentage Yield It is a measure of the success or efficiency of a reaction based on the theoretical amount of desired product that should be produced 18 of 18
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