2.12.1 Group 2- Properties And Trends

Question 1

What is the trend in atomic radius down group 2?

Answer 1

Atomic radius increases down the group

- there is more shielding

Question 2

What is the trend in first ionisation energy down group 2?

Answer 2

First ionisation decreases down group 2

- the atomic radius increases

Question 3

What is the trend in melting point down group 2?

Answer 3

Melting points generally decrease down group 2

- the radius of the metal ions increase, reducing the force of attraction, reducing the strength of the metallic bond

Question 4

Which group 2 metal deviates from melting point trend?

Answer 4

Magnesium has the lowest melting point in group 2

Question 5

What is the general equation for group 2 metals reacting with water?

Answer 5

M(s) + 2H2O(l) ➡️ M(OH)2(aq) + H2(g)

Question 6

What happens when magnesium reacts with water?

Answer 6

It reacts very slowly

Question 7

What happens when magnesium reacts with steam?

Answer 7

Mg burns with a bright white light when it is heated with steam
A white solid, MgO is produced
- Mg(s) + H2O(g) ➡️ Mgo(s) + H2(g)

Question 8

What happens when calcium reacts with water?

Answer 8

It reacts steadily with cold water. The reaction is exothermic, and the rate of reaction increases as the reaction mixture heats up.
Calcium hydroxide is slightly soluble and produces a cloudy white precipitate from the undissolved Ca(OH)2

Question 9

How are strontium and barium stored?

Answer 9

They are stored in oil to stop them reacting with the air

Question 10

What is another name for the group 2 elements?

Answer 10

The alkaline earth metals