Group 2 3.1.2

Question 1

What happens to Atomic Radius in group 2?

Answer 1

Atomic radius increases down group 2

Question 2

Whay does the Atomic Radius change in group 2?

Answer 2

There is a greater amount of sheilding down group two due to the increased number of sbu-shells

Question 3

What trend does the Ionisation of group 2 elements follow?

Answer 3

Ionisation energy decreases down group 2.
This is due to the attraction between the nucleus and electrons being weaker due to being further away.
As well as a greater amount of shielding

Question 4

What happens to Reactivity in group 2?

Answer 4

Reactivity increases down the group

Question 5

Why does Reactivity increase down group 2?

Answer 5

It is easier to remove electrons from the atom when there is a low ionisation energy

Question 6

How does group 2 react with Oxygen?

Answer 6

Metal + Oxygen → Metal Oxide

eg. 2Ca + O2 →2CaO

Question 7

How does group 2 react with Water?

Answer 7

Metal + Water → Metal Hydroxide + Hydrogen

eg. Ca + 2(H2O) → Ca(OH)2 + H2

Question 8

What is the trend of solubility of group 2 hydroxides?

Answer 8

Solubility of group 2 hydroxides increase down group 2.

Because there are more OH- in the solution

Question 9

What is Thermal Decomosition of a group 2 Carbonate?

Answer 9

Group 2 carbonate → Metal Oxide + Carbon Dioxide

eg. CaCO3 → CaO + CO2

Question 10

What is the reaction between group 2 oxides and water?

Answer 10

Metal Oxide + Water → Metal Hydroxide

eg. CaO + H20 → Ca(OH)2

Question 11

What are uses of group 2 hydroxides?

Answer 11

Calcium Hydroxide is used to neutralise soil PH

Magnesium Hydroxide is used to relive indigestion, it neutralises stomach acid