Group 2 Cmpd- Thermal Stability

Question 1

Explain the trend of carbonate

Answer 1

-cation charge remains the same but cationic size increases;

• decreases in charge density of cations;
• polarising power of cation decreases;
• cations less able to distort e cloud of large CO32-;
• C-O bond is less weakened

=>greater energy is req to decompose

Question 2

Comparing bt specific cmpd uses?

Answer 2

Lattice energy

Question 3

Describe LE down the gp

Answer 3

Decreases

-> radius increases

Question 4

Describe the trend of carbonate

Answer 4

Ease of thermal decomposition decreases;

Thermal stability increases

Question 4

Describe the trend (thermal decomposition) of nitrates

Answer 4

Decreases

Question 5

Explain the trend of nitrate decomposition

Answer 5

-charge of cations remain the same;

• charge density decreases;
• having weaker polarising power;
• less able to distort electron cloud of anion to a greater extent;

-N-O bond in nitrate is less weakened

=>greater amt of energy…