Group 2 Flashcards
1
Q
Reactivity down the group
A
- decreased IE
- increased atomic radius
- increased shielding
- better reducing agent
2
Q
Group2 + O2
A
M(s) + 1/2O2(g) -> MO(s)
2
Q
Group2 +water
A
M(s) + 2H2O(l) -> M(OH)2(aq) + H2(g)
3
Q
Group2 + dilute acid
A
M(s) + 2HCl(aq) -> MCl2(aq) + H2(g)
4
Q
Metal oxide + water
A
MO(s) + H2O(l) -> M^2+(aq) + 2OH-
5
Q
Metal oxides
A
- base
- increased alkalinity down the group(and rate of reaction)
- hydroxides become more soluble
- Mg(OH)2 doesn’t
6
Q
Metal hydroxides
A
white ppt
7
Q
Ca(OH)2
A
- used in agriculture
- neutralises acidic soils
8
Q
Mg(OH)2 and CaCO3
A
- indigestion tablets
- antacids
9
Q
G2 physical properties
A
- metals
- high mpt and bpt
- form colourless ionic compounds
- good conductors
- form 2+ cations
10
Q
Mg flame test
A
white
11
Q
Ca flame test
A
brick-red
12
Q
Sr flame test
A
crimson
13
Q
Ba flame test
A
green
14
Q
Melting point down the group
A
- decreases
- increased atomic radius
15
Q
Decomposition of metal carbonate
A
MCO3(s) -> MO(s) + CO2(g)
16
Q
Mg with H20
A
- reacts slowly with cold water
- reacts with steam
3.produces MgO
17
Q
Metal oxide with acid
A
MO(s) + 2acid -> salt + H2O
18
Q
Metal hydroxide with acid
A
M(OH)2 (s) + 2acid -> salt + 2H2O
