Thermodynamics

Question 1

Lattice Enthalpy

Answer 1

Enthalpy change when 1 mole of an ionic compound is formed from its gaseous ions under standard conditions

Question 2

Enthalpy of atomisation

Answer 2

Enthalpy change when 1 mole of gaseous atoms are formed under standard conditions.

Question 3

Electron affinity

Answer 3

Energy change when one mole of gaseous atoms gain an electron

Question 4

Enthalpy of hydration

Answer 4

Enthalpy change that accompanies dissolving of gaseous ions in water to form one mole of aqueous ions

Question 5

Enthalpy of solution

Answer 5

Enthalpy change that accompanies when one mole of a solid ionic lattice dissolves

Question 6

Entropy

Answer 6

Measure of disorder in a system.

Question 7

Units of entropy

Answer 7

J/K/mol

Question 8

ΔS =

Answer 8

S(products) - S(reactants)

Question 9

Why is Gibbs free energy used?

Answer 9

Calculate if a reaction is spontaneous or not at a given temperature

Question 10

ΔG =

Answer 10

ΔH - TΔS

Question 11

To find what temperature a reaction is spontaneous

Answer 11

T = ΔH / ΔS

Question 12

On a graph

Answer 12

y = mx + c
y = ΔG | m = -ΔS | x = T | c(y-intercept) = ΔH