Enthalpy Changes Fact Recall.

Question 1

What is meant by the term enthalpy change?

Answer 1

The heat energy transferred in a reaction at a constant pressure.

Question 2

What’s the symbol for enthalpy change?

Answer 2

🔺️H

Question 3

Give two different definitions of lattice enthalpy.

Answer 3

• The lattice formation enthalpy change when 1 mole of a solid ionic compound is formed from its gaseous ions.
• The lattice dissociation enthalpy is the enthalpy change when 1 mole of a solid ionic compound is completely dissociated into it’s gaseous ions.

Question 4

Give the symbol for enthalpy of hydration.

Answer 4

🔺️H hyd

Question 5

Give the symbol for enthalpy of bond dissociation.

Answer 5

🔺️H diss