1.4 Energetics

Question 1

What is standard enthalpy changes?

Answer 1

When 1 mole of a compound is formed from its elements under standard conditions

Question 2

what is standard enthalpy change of combustion?

Answer 2

will always be exothermic as burning relases heat
Combustion enthalpy must always start with 1 mole of what substance you are burning

Question 3

what is an enthalpy change?

Answer 3

Bonds broken - bonds formed

Question 4

describe exothermic

Answer 4

Energy released from formation is more then energy needed to break bonds

Question 5

Describe endothermic

Answer 5

energy absorbed to break bonds is greater than energy released from making them

Question 6

what is bond dissociation enthalpy

Answer 6

The enthalpy change needed to break a covalent bond with all species in a gaseous state

Question 7

what is mean bond enthalpy

Answer 7

The average values of the bond dissociation enthalpy taken from a range of different compounds