Energetics

Question 1

Enthalpy change

Answer 1

q=mcΔT

q= heat in joules

Question 2

ΔSystem=

Answer 2

ΔSystem= Δproducts - Δreactants

Question 3

Δsuroundings=

Answer 3

Δsuroudings = -ΔH/T

ΔH in joules

Question 4

Δtotal=

Answer 4

Δtotal = Δsystem + Δsuroundings

The more posative, the more soluable

Question 5

ΔG

Answer 5

ΔG= ΔH - TΔsystem

If 0 or negative is feasible

Question 6

Enthalpy change definitions

Answer 6

Enthalpy change where 1 mole…
(+)= endo
(-)= exo

ΔHf = Formation (-) compound formed from its elements 
ΔHat = Atamisation (+) standard state into gaseous 
ΔHi = Ionisation (+) gasous element into posative gasous ion 
ΔHea = Electron affinity (-) gasous element into gasous negative ion 
ΔHl = Latice (-) solid ionic formed from gasous ions

Question 7

ΔHsolution

Answer 7

ΔHsolution = ΔHhydration - ΔHlatice

If solution is negative it is more soluble.

Question 8

Charge density

Answer 8

Lower charge density = less exothrrmic the enthalpy of hydration.
Lower charge density = more thermodynamically stable