Energetics

Question 1

What is enthalpy change?

Answer 1

the heat energy transferred at constant pressure

Question 2

standard enthalpy change of combustion

Answer 2

the enthalpy change when 1 mole of a substance is completely burnt in excess oxygen with all substances in their standard states and under standard conditions ( 298k and 100kpa)

Question 3

standard enthalpy change of formation

Answer 3

the enthalpy change when 1 mole of a compound is formed from its
constituent elements with all elements in their standard states and under standard conditions

Question 4

enthalpy change of atomization

Answer 4

the enthalpy change that is accompanied by the formation of 1 mole of gaseous atoms where all reactants are under standard conditions and in their standard states

Question 5

Mean bond enthalpy

Answer 5

the enthalpy change required to break a covalent bond into gaseous atoms averaged over different molecules.

Question 6

Enthalpy of formation equation

Answer 6

the sum of the products- the sum of reactants

Question 7

enthalpy of combustion equation

Answer 7

the sum of reactants- the sum of products