3.6 And 3.7 Enthalpy And Entropy

Question 1

Standard enthalpy change of combustion

Answer 1

Enthalpy change when one mole of the compound is burned completely in oxygen under standard conditions, and with everything in its standard state

Question 2

Hess’ Law

Answer 2

The enthalpy change accompanying a chemical change is independent of the route by which the chemical change occurs

Question 3

Enthalpy change of atomisation

Answer 3

Enthalpy change to form one mole of atoms in the gas phase under standard conditions

Question 4

Enthalpy change of lattice formation

Answer 4

One mole of an ionic compound is formed from ions of the elements in the gas phase

Question 5

Enthalpy change of lattice breaking

Answer 5

One mole of an ionic compound is broken up into ions of the elements in the gas phase

Question 6

Enthalpy change of hydration

Answer 6

One mole of gaseous ions is surrounded by water molecules to make a solution

Question 7

Enthalpy change of a solution

Answer 7

One mole of an ionic compound dissolves in water to form a solution