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Sarah Stancombe- Chains, Energy and Resources (F322)
Enthalpy Change of Combustion- The enthalpy change for the complete combustion of 1 mol (of a substance).
Standard Conditions- pressure: 100 kPa and temperature: 298 K.
Atom Economy- (sum of) the molecular masses of the desired product ÷ sum of molecular masses of all
products × 100.
Radical- Species with an unpaired electron.
Le Chatelier's Principle- The position of equilibrium will shift so as to minimise the effect of any change in
Structural Isomer- Same molecular formula but different structural formulae.
Homologous Series- Series having same functional group and a general formula.
Standard Enthalpy Change of Formation- (Enthalpy change) when one mole of a compound is made from its
elements (in their standard states). (Standard conditions are) 298 K and 100 kPa.
Enthalpy Change of Reaction- (enthalpy change when) the number of moles of reactants as specified in the
(balanced) equation react together.
Average Bond Enthalpy- (Enthalpy change) when one mole of bonds of (gaseous covalent) bonds is broken.
Enthalpy Change of Combustion- (Enthalpy change) when one mole of a substance is completely combusted.
Functional Group- group of atoms that give a compound its (characteristic set of) reactions.
Endothermic- Reaction in which energy enters the system (from the surroundings).
Activation Energy- Activation energy is the minimum amount of energy needed for the reactants to react.
Stereoisomerism- Same structural formula but a different arrangement of groups around a double bond.
Functional Group- Group of atoms (in a molecule or compound) that is responsible for the reactions.
Radical- species with an unpaired electron.
Standard Enthalpy Change of Formation- (Enthalpy change) when one mole of a compound is formed from its
elements at298 K and 100 kPa.