13:Group 2

Question 1

What happens to reactivity going down group 2

Answer 1

Reactivity increases

Question 2

Why does reactivity increase going down group 2

Answer 2

The 1st and 2nd ionisation energies decrease and this means activation energies decrease and reactions are faster.

Question 3

What does the reaction of a group 2 metal and oxygen produce

Answer 3

Produces a metal oxide eg.

2Mg(s) + O₂(g) → 2MgO(s)

Question 4

What does the reaction of a group 2 metal and water produce

Answer 4

A metal hydroxide and hydrogen gas eg.

Ca(s) + 2H₂O(l) → Ca(OH)₂(aq) + H₂(g)

Question 5

What does the reaction of a group 2 metal and acid produce

Answer 5

Salt and hydrogen gas eg.

Mg(s) + 2HCl(aq) → MgCl₂(aq) + H₂(g)

Question 6

What does the reaction of a group 2 metal oxide and water produce

Answer 6

Hydroxide eg.

MgO(s) + H₂O(l) → Mg(OH)₂(s)

Question 7

What happens to the hydroxides produced by group 2 oxides going down the group (in terms of solubility and pH)

Answer 7

The hydroxides become increasingly more soluble and increasing pH

Question 8

What does the reaction of a group 2 metal oxides and acid produce

Answer 8

Salt and water eg.

CaO(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l)

Question 9

What are 2 uses for group 2 compounds as acid neutralisers

Answer 9

Indigestion tablets as antacids

Used in agriculture to neutralise acidic soils