A2 - Key Definitions
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What is activation energy?
minimum energy required for a reaction to take place between 2 colliding reactant particles
What is the standard enthalpy change of formation?
enthalpy change when 1 mole of compound forms from elements, under standard conditions
What is the standard enthalpy of combustion?
enthalpy change when 1 mole of a substance combusts completely in oxygen, under standard conditions
What is the standard enthalpy change of neutralisation?
enthalpy change when an acid and alkali neutralise under standard conditions, to form 1 mole of water
Energy transfer in an exothermic reaction
-enthalpy change is negative -chemical system loses energy -surroundings gain energy -temperature of surroundings increases