Enthalpy

Question 1

enthalpy change of reaction

Answer 1

when the number of moles (as specified in the balanced equation) react together

under standard conditions, and all reactants and products in thier standard states

Question 2

enthalpy change of formation

Answer 2

1 mole of compound is formed from its element

products - reactants

under standard conditions, and all reactants and products in thier standard states

Question 3

enthalpy change if combustion

Answer 3

one mole of substance is combusted compleatly in oxygen

reactants - products

under standard conditions, and all reactants and products in thier standard states

Question 4

enthalpy change of neutralisation

Answer 4

when solutions of an acid and alkali react together to produce 1 mole of water

under standard conditions, and all reactants and products in thier standard states

Question 5

average bond enthalpy

explanation

Answer 5

the breaking of one mole of bonds in gaseous molecules