Chemistry Definitions 0.0 / 5 ? ChemistryDefinitionsASEdexcel Created by: mimipopxCreated on: 23-04-16 11:15 1 mole the amount of substance containing the Avogadro number of atoms, molecules or ions 1 of 30 Atomic number the number of protons in the nucleus of an atom of that element 2 of 30 Relative atomic mass the weighted average mass of an atom of that element divided by 1/12th the mass of a C-12 atom 3 of 30 Relative molecular mass the average mass of a molecule divided by 1/12th the mass of a C-12 atom 4 of 30 Mass number the sum of the protons and neutrons in the nucleus of an atom 5 of 30 Relative isotopic mass the mass of an atom of that isotope divided by 1/12th the mass of a C-12 atom 6 of 30 Isotopes atoms of the same element with the same number of protons but different number of neutrons 7 of 30 1st ionization energy the energy required to remove 1 mole of electrons from 1 mole of GASEOUS atoms to form 1 mole of +1 ions 8 of 30 An orbital a region in space occupied by one or two electrons 9 of 30 Effective nuclear charge the net charge on the nucleus (proton number - number of electrons in inner shells) 10 of 30 1st electron affinity the energy change when one mole of electrons is added to one mole of neutral gaseous atoms 11 of 30 Electronegativity the extent to which it attracts a pair of bonding electrons in a covalent bond 12 of 30 Dative covalent bond a covalent bond in which both electrons in the shared pair are provided by one atom 13 of 30 Disproportionation a redox reaction in which an element in a single species is both oxidized and reduced 14 of 30 Isomers same molecular formula but different structural formulae 15 of 30 Structural isomer same MOLECULAR formula, different arrangement of atoms 16 of 30 Radical species with an unpaired electron 17 of 30 Hazard the potential to do harm 18 of 30 Risk the probability of harm occurring (reduce a risk) 19 of 30 SHC heat required to increase the temperature of 1g of substance by 1 degree 20 of 30 Standard enthalpy of formation energy change when 1 mole of substance is formed from its elements in their standard states 21 of 30 Standard enthalpy of combustion energy change when 1 mole of substance is burned in excess oxygen 22 of 30 Standard enthalpy of neutralization energy change when 1 mole of water is produced by the neutralization of an acid by excess base 23 of 30 Standard enthalpy of atomization energy change when 1 mole of gaseous atoms is formed from the element 24 of 30 Rate of reaction change in concentration in a given time 25 of 30 Activation energy the minimum KE that the colliding particles must possess for the collisions to be successful 26 of 30 Homogenous same phase 27 of 30 Heterogeneous different phases 28 of 30 A catalyst speeds up a reaction by providing an alternative route with a lower activation energy 29 of 30 Activation Energy the minimum quantity of energy which the reacting species must possess in order to undergo a specified reaction. 30 of 30
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