Enthalpy changes

Question 1

Predict and explain the change in delta T and delta H when a larger volume of water is used

Answer 1

Prediction:

(a) temperature change will be less
(b) enthalpy change will be the same

Why?

(a) same energy is released but it is spread over a larger volume, so temperature rise is smaller
(b) same mass of x therefore same energy will be released PER MOLE.

Question 2

Enthalpy change using bond enthalpies

Answer 2

Bonds broken (reactants) - Bonds formed (products)

Question 3

Entropy change

Answer 3

(Entropy of products) - (Entropy of reactants)