Group 1 Flashcards
1
Q
Trend in ionisation energy
A
Decreases down the group
2
Q
Trend in reactivity
A
Increases down the group
3
Q
Trend in thermal stability of group 1 carbonates/nitrates
A
Increases down the group
4
Q
Explain the trend in thermal stability of group 1 carbonates/nitrates
A
- As you go down the group, charge density of group 1 ions decreases
- Polarises large electron cloud of carbonate/nitrate less
- Less distortion so more stability
5
Q
Reaction for thermal decomposition of LiCO3 (no others decompose)
A
Li2CO3 —-> Li2O + CO2
6
Q
Reaction for thermal decomposition of group 1 nitrates (except lithium)
A
2MNO3 —-> 2MNO2 +O2
7
Q
Reaction for thermal decomposition of LiNO3
A
LiNO3 —-> Li2O +NO2 +O2
8
Q
How to test for thermal stability
A
- measure time taken for a specific volume of gas to be produced using a gas syringe
