Topic 10 - Group 2 Flashcards
What charged ions do group 2 elements form when they react?
+2
Does the atomic radius increase or decrease down group 2?
Increase
Why does the atomic radius increase down the group?
More shells
Does the first ionization energy increase or decrease down group 2?
Decrease
Does the reactivity increase or decrease down group 2?
Increase
Why does the 1st ionisation energy decrease down the group?
More shielding because of more shells.
What do group 2 elements make when they react with water?
Bases (metal hydroxides.
Does the reactivity with water increase or decrease down group 2?
Increase
Does Beryllium react with water?
No.
How fast does Mg react with cold water?
Slowly
What is formed when Mg reacts with steam?
MgO (Magnesium Oxide)
What do group 2 elements make when they react with oxygen?
Bases (metal oxides)
What color flame does Mg make when it is burnt in oxygen?
Bright white
What color and state are group 2 oxides?
White solids
What color flame does Ca make when it is burnt in oxygen?
Red
What color flame does Ba make when it is burnt in oxygen?
Green
When group 2 oxides react with water, is the solution produced acidic or alkaline?
Alkaline
Does the solubility of the hydroxides increase or decrease down group 2?
Increase
Can group 2 oxides and hydroxides neutralise acids?
Yes
What is thermal decomposition?
When a compound breaks apart through heating.
What do group 2 carbonates thermally decompose into?
Metal oxides and carbon dioxide
What do group 2 nitrates thermally decompose into?
Metal oxides, nitrogen dioxide, and oxygen
Do group 2 carbonates/nitrates become more or less thermally stable down the group?
More thermally stable.
Why do group 2 carbonates/nitrates become more thermally stable down the group?
There is less distortion between the positive metal ion and the carbonate/nitrate ion. This is because of a lower charge density in the lower group 2 metals.
