Enthalpy Changes

Question 1

Write the definition of enthalpy change of neutralisation

Answer 1

Standard enthalpy change of neutralisation is the enthalpy change when solutions of an acid and an alkali react together under standard conditions to produce 1 mol of water

Question 2

Definition of enthalpy change of formation

Answer 2

Standard enthalpy change of formation of a compound is the enthalpy change when 1 mol of the compound is formed from its elements under standard conditions all reactants and products being in their standard states

Question 3

Definition of enthalpy change of combustion

Answer 3

Standard enthalpy of combustion of a substance is defined as enthalpy change that occurs when one mole of a substance is combusted completely in oxygen under standard conditions all reactants and products being in their standard states

Question 4

Draw exothermic graph

Answer 4

Don’t forget
Enthalpy change
Activation energy
Products and reactants

Question 5

Draw endothermic

Question 6

Standard conditions

Answer 6

298K and 100kPa

Question 7

Equation for determination of enthalpy changes

Answer 7

q= mct

Question 8

Average bond enthalpy definition

Answer 8

Enthalpy change when one molecule of bonds of gaseous covalent bonds is broken