Chem definition 0.0 / 5 ? ChemistryASAQA Created by: KamilaCreated on: 24-05-13 13:58 Enthalpy change change in heat measured at constant pressure 1 of 25 Standard enthalpy of formation Enthalpy change when one mole of a compound is formed from its elements at 298K and 100 kPa 2 of 25 Standard enthalpy of combustion Enthalpy change when one mole of a substance is completely burnt at 298K and 100 kPa 3 of 25 Hess's law Total enthalpy change is independent of route 4 of 25 Bond dissociation energy Enthalpy needed to break a covalent bond in the gas phase 5 of 25 Mean bond enthalpy Enthalpy required to break a covalent bond averaged over many compounds 6 of 25 Activation energy Minimum energy needed for a reaction to occur 7 of 25 Catalyst Speeds up a reaction without being used up 8 of 25 Rate of reaction the change in concentration of a substance in a given time (units are mol dm-3 s-1) 9 of 25 Le Chatelier’s Principle When the conditions on a system in equilibrium are changed, the equilibrium moves to oppose the change 10 of 25 Dynamic equilibrium Forward rate = backward rate 11 of 25 Stereoisomers same structural formula but different arrangement of atoms in space 12 of 25 E/Z isomers isomers resulting from restricted rotation about a double bond, where two different groups are attached to each carbon of the C=C 13 of 25 Unsaturated contains one or more double C=C bonds 14 of 25 Electrophile electron pair acceptor 15 of 25 Fuel a substance that is burned to produce heat 16 of 25 Biofuel a fuel produced from biological sources 17 of 25 Carbon neutral an activity that has no net annual carbon emissions to the atmosphere 18 of 25 Nucleophile lone pair donor 19 of 25 Hydrolysis breaking bonds using water 20 of 25 Radical contains an unpaired electron 21 of 25 Oxidation loss of electrons or increase in oxidation number 22 of 25 Reduction gain of electrons or decrease in oxidation number 23 of 25 Oxidising agent electron acceptor 24 of 25 Reducing agent electron donor 25 of 25
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