thermochemistry

Question 1

heat of reaction

Answer 1

the heat of reaction is the heat change when the number of moles of reactants indicated in the balanced equation react completely

Question 2

heat of combustion

Answer 2

heat of combustion is the heat change when 1 mole of the substance reacts completely with excess oxygen

Question 3

kilogram calorific value

Answer 3

kilogram calorific value is the heat change change when 1 kilogram of the substance reacts completely with excess oxygen

Question 4

bond energy

Answer 4

the bond energy is the energy required to break 1 mole of covalent bonds and to separate the neutral atoms completely from each other

Question 5

heat of formation

Answer 5

heat of formation is the heat change when 1 mole of a compound in its standard state is formed from its elements in their standard state

Question 6

heat of neutralisation

Answer 6

heat of neutralisation is the heat change when 1 mole of H+ ions from the acid reacts with 1 mole of OH- ions from the base

Question 7

hess’ law

Answer 7

hess’ law states that if a chemical reaction occurs in a number of stages, the sum of the heat changes for each stage is equal to the heat change if the reaction is carried out in one stage