A2 - Key Definitions Flashcards
1
Q
What is activation energy?
A
minimum energy required for a reaction to take place between 2 colliding reactant particles
2
Q
What is the standard enthalpy change of formation?
A
enthalpy change when 1 mole of compound forms from elements, under standard conditions
3
Q
What is the standard enthalpy of combustion?
A
enthalpy change when 1 mole of a substance combusts completely in oxygen, under standard conditions
4
Q
What is the standard enthalpy change of neutralisation?
A
enthalpy change when an acid and alkali neutralise under standard conditions, to form 1 mole of water
5
Q
Energy transfer in an exothermic reaction
A
-enthalpy change is negative
-chemical system loses energy
-surroundings gain energy
-temperature of surroundings increases
