3.1.2 group 2

Question 1

How do group 2 elements act as reducing agents?

Answer 1

Group 2 elements reduce another species in a redox reaction.
Leads to 2+ ions.

Question 2

What is the trend of reactivity down group 2?

Answer 2

Reactivity increases down group 2.

Question 3

What do group 2 elements react with to form metal oxides?

Answer 3

Group 2 elements react with oxygen to form a metal oxide.
In which something is reduced and oxidised.

Question 4

What do group 2 elements react with to form an alkaline hydroxide?

Answer 4

Group 2 elements react with water to form an alkaline hydroxide and hydrogen gas.

Question 5

What do group 2 elements form when reacted with dilute acids?

Answer 5

Group 2 elements react with dilute acid to form salt and hydrogen gas.

Question 6

Why do ionisation energies decrease down group 2?

Answer 6

The ionisation energies decrease down the group because he attraction between the nucleus and the outer electrons decreases as a result of increasing atomic radius and increasing shielding.

Question 7

What is the solubility of group 2 elements hydroxides?

Answer 7

The solubility of hydroxides in water increases down the group, so the resulting solutions contain more OH- (aq) ions and are more alkaline.

Question 8

What is the reaction between group 2 oxides and water?

Answer 8

The oxides of group 2 elements react with water, releasing hydroxide ions and forming alkaline solutions of the metal hydroxide.
Only slightly soluble in water.

Question 9

How can group 2 compounds be used in agriculture?

Answer 9

Calcium hydroxide (Ca(OH)2) is added to fields as lime by farmers to increase the pH of acidic soils.

Question 10

How can group 2 compounds be used in medicine?

Answer 10

Often used as antacids for treating acid indigestion.
Neutralisation reaction between Mg(OH)2 and CaCO3.