Energetics

Question 1

Enthalpy change

Answer 1

Heat energy change at constant pressure

Question 2

Standard conditions

Answer 2

100kPa and 298K

Question 3

Standard enthalpy of combustion

Answer 3

the enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions

Question 4

Standard enthalpy of formation

Answer 4

enthalpy change if 1 mole of compound in standard state were formed directly from its elements under standard conditions

Question 5

Hess’s Law

Answer 5

enthalpy change for a reaction is independent of the route taken

Question 6

Enthalpy of combustion equation

Answer 6

reactants - products

Question 7

Enthalpy of formation equation

Answer 7

products - reactants

Question 8

Equation for heat energy

Answer 8

q = mcΔT

Question 9

How to get from q to ΔH

Answer 9

divide by 1000 then mols

Question 10

Bond dissociation energy

Answer 10

enthalpy change to break the bond in 1mol of gaseous molecules to form gaseous atoms

Question 11

Mean bond enthalpy

Answer 11

The Enthalpy Change needed to break 1mol of covanlent bonds averaged over a range of compounds

Question 12

Enthalpy change equation

Answer 12

bonds broken - bonds formed (reactants-products)