Chemistry Definitions 0.0 / 5 ? ChemistryEnthalpyASEdexcel Created by: ryanh2197Created on: 14-01-14 20:54 The smallest particle of a chemical element that can exist Atom 1 of 15 A pure substance that cannot be broken down chemically into anything simpler Element 2 of 15 A charged atom or charged group of atoms Ion 3 of 15 A group of atoms bonded together Molecule 4 of 15 Something that is composed of two or more separate elements Compound 5 of 15 The simplest ratio of atoms in a compound Empirical - Formula 6 of 15 The exact number of different atoms in one molecule of a compound Molecular formula 7 of 15 The average mass of all the isotopes of a particular atom compared to the mass of a Carbon-12 atom Relative atomic mass 8 of 15 The mass of a particular isotope of an atom compared to the mass of a carbon-12 atom Relative isotopic mass 9 of 15 The average mass of a molecule compared to the mass of a Carbon-12 atom Relative molecular mass 10 of 15 The relative molecular or formula mass in grams per mole Molar mass 11 of 15 The number of atoms in exactly 12 grams of Carbon-12 Avogadro Constant 12 of 15 The heat exchanged by a reaction at constant pressure Enthalpy change 13 of 15 The enthalpy change for a reaction is independent to the route taken between products and reactants Hess's Law 14 of 15 The distortion of the negative ion as a result of the electrons being attracted by the positive ion Polarisation 15 of 15
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