Chemistry Paper 1

Question 1

Lattice Enthalpy

Answer 1

enthalpy change that occurs when 1 mol of an ionic compound is formed from its gaseous ions

Question 2

Lattice change of solution

Answer 2

Enthalpy change for dissolving 1 mol of a compound

Question 3

Lattice enthalpy of hydration

Answer 3

Enthalpy change that accompanies the formation of 1 mol of an ionic compound from its gaseous ions under standard conditions

Question 4

Difference between deltaH hydration values for Na+ and Mg2+

Answer 4

Mg2+ has a greater change than Na+
Mg2+ is smaller than Na+
Mg2+ has a stronger attraction to H2O

Question 5

Standard electrode potential

Answer 5

The e.m.f of a half cell compared with a standard hydrogen electrode at a temp of 298k, pressure of 100kPa and concs of 1moldm-3