group 2 Flashcards
1
Q
why doesn’t magnesium fit the melting point trend
A
- crystalline structure
2
Q
solubility of g2 hydroxide in water
A
BeO: insoluble
MgO: sparingly soluble
CaO: slightly soluble
SrO: quite soluble
BaO: very soluble
3
Q
For hydroxides of group 2, why will basic strength increase down the group?
A
- solubility increases
- charge density increases
- split away frlm each other more easily
- greater concentration of OH- ions in water
4
Q
Properties of carbonates in group 2
A
- insoluble in water
- thermal decomposition
- ease of decomposition decreases down group (smaller ion + greater charge density: holds O2- to make more stable compound)
5
Q
Properties of Sulfates
A
- solubility decreases down group (less attracted to polar water molecules)
6
Q
g2 metal + dilute acid
A
colourless solutions of metal salt
7
Q
metal + acid
A
Hydrogen gas
8
Q
Calcium hydroxide
A
limewater
9
Q
G2 oxide states
A
all basic except for BeO (amphoteric)
10
Q
why does g2 oxide gets more alkaline going down?
A
- hydroxide becomes more soluble
- more hydroxide ion dissociate
