chapter 9 enthalpy

Question 1

what is the standard pressure for an enthalpy reaction?

Answer 1

100 kPa

Question 2

what is the standard temperature for an enthalpy reaction?

Answer 2

298 K or 25 degrees

Question 3

what is the standard concentration for an enthalpy reaction?

Answer 3

1 mol dm-3 only for solutions

Question 4

what is the standard state for reactants of an enthalpy reaction?

Answer 4

the physical state of the substance under standard conditions

Question 5

what is the standard enthalpy change of reaction?

Answer 5

the enthalpy change of a reaction under standard conditions for a stated reaction

Question 6

what is the standard enthalpy change of formation?

Answer 6

the enthalpy change when one mole of a substance is formed from it’s elements under standard conditions with all reactants and products in their standard states

Question 7

what is the enthalpy change of formation for an element and why?

Answer 7

is 0 kJ mol-1 because you are forming an element from it’s element so there is no change

Question 8

what is the standard enthalpy change of combustion?

Answer 8

the enthalpy change for one mole of substance to react fully with oxygen under standard conditions with all reactants and products in their standard states

Question 9

what is the standard enthalpy change of neutralisation?

Answer 9

the enthalpy change to form one mole of water from the neutralisation reaction between an acid and a base under standard conditions with all reactants and products in their standard states