Group 2 Flashcards
1
Q
What is the equation for a reaction with oxygen
A
2Ca + O2 –> 2CaO
2
Q
What are the flame colours of Mg, Ca, Sr and Ba
A
White, Brick Red, Crimson, Apple Green
3
Q
What are the reactions with water?
A
Mg + H2O(g) –> MgO + H2
Magnesium doesn’t do the following reaction because Mg(OH)2 is insoluble and it forms a waterproof coating around the Mg
Ca + 2H2O(l) –> Ca(OH)2 + H2
4
Q
What are some uses of group II metals
A
Ca(OH)2 can be used for neutralising acidic soil. Mg(OH)2 and CaCO3 can be used as antacids in treating indigestion.
5
Q
Reactions of Group II oxides with water
A
CaO + H2O –> Ca(OH)2
6
Q
The trend of solubility of Group II hydroxides
A
As you go down the group, the hydroxides become more soluble and so more alkaline.
