Topic 27 - Group 2

Question 1

What affects thermal stability of Group 2 compounds

Answer 1

Charge density of the cation increases, thermal stability decreases
Polarisation of the anion increases, thermal stability decreases

Therefore thermal stability increases down the group

Question 2

State and explain

Trend is solubility of Group 2 Sulphates

Answer 2

Decreases down the ground as lattice energy falls slower than enthalpy of hydration, meaning enthalpy of solution becomes more endothermic

Question 3

State and Explain

Trends in solubility of Group 2 Hydroxides

Answer 3

Increases down the group as lattice energy falls faster than enthalpy of hydration, therefore enthalpy of solution gets more exothermic

Question 4

What are the two factors affecting thermal stability ?