3.1.2 - Group 2

Question 1

What is a common name given to group 2 metals?

Answer 1

Alkaline earth metals

Question 2

What is the most reactive metal of group 2?

Answer 2

Barium

Question 3

List 3 physical properties of group 2 metals

Answer 3

High melting and boiling points
Low density metals
Form colourless (white) compounds

Question 4

The highest energy electrons of group 2 are in which subshell?

Answer 4

S subshell

Question 5

Does reactivity increase of decrease down group 2?

Answer 5

Increases

Electrons are lost more easily because larger atomic radius and more shielding

Question 6

What happens to the first ionisation energy as you go down group 2? Why?

Answer 6

Decreases because:

Number of filled electron shells increases down the group —-> increased shielding

Increased atomic radius —-> weaker forces between outer electrons and nucleus —–> less energy needed to remove electron

Question 7

What type of reaction is the reaction between group 2 elements and oxygen?

Answer 7

Redox reaction

Question 8

Write an equation for the reaction of calcium and oxygen

Answer 8

2Ca (s) + O2 (g) ——–> 2CaO (s)

Question 9

What are the products when group 2 elements react with water?

Answer 9

Hydroxide and hydrogen gas

Question 10

Which group 2 element does react with water?

Answer 10

Beryllium

Question 11

Which group 2 element reacts very slowly with water?

Answer 11

Magnesium

Question 12

What type of reaction is the reaction between group 2 metal and water?

Answer 12

Redox reaction

Question 13

Write an equation for the reaction of barium and water

Answer 13

Ba (s) + 2H2O (l) —-> Ba(OH)2 (aq) + H2 (g)

Question 14

What is oxidised in a reaction between group 2 metal and water?

Answer 14

Metal is oxidised

One hydrogen atom from each water is reduced

Question 15

What are the products when a group 2 element reacts with a dilute acid

Answer 15

Salt and hydrogen gas

Question 16

Write an equation for the reaction of calcium and hydrochloric acid

Answer 16

Ca (s) + 2HCl (aq) ——> CaCl2 (s) + H2 (g)

Question 17

What is formed when group 2 oxides react with water?

Answer 17

Metal hydroxides

Question 18

Write an equation for the reaction between a group 2 oxide and water

Answer 18

MO (s) + H2O (l) ——> M(OH)2 (aq)

Question 19

What group 2 metal oxide is insoluble in water?

Answer 19

Beryllium oxide

Question 20

What is the trend in hydroxide solubility down group 2?

Answer 20

/Increases down the group

Mg(Oh)2 is slightly soluble

Ba(OH)2 creates a strong alkaline solution

Question 21

What is Ca(OH)2 used for?

Write an equation related to one of its uses

Answer 21

Used to neutralise soil

Ca(OH)2 (aq) + 2HCl (aq) —-> 2H2O (l) + CaCl2 (aq)

Question 22

What is Mg(OH)2 used for?

Answer 22

Milk of magnesia-antacid to treat indigestion, heartburn etc

Question 23

What is calcium carbonate used for?

Answer 23

Present in limestone and marble

Used in building construction

Question 24

What is the drawback of using calcium carbonate in construction?

Write a related equation

Answer 24

Group 2 carbonated react with acid

CaCO3 (s) + 2HCl (aq) —-> CaCl2 (aq) + H2O (l) +CO2 (g)