Group 2

Question 1

What are oxidation states?

Answer 1

They simplify the whole process of working out what is being oxidised or reduced in a reaction.

Question 2

What is the oxidation state of an uncombined element?

Answer 2

Zero

Question 3

What is the sum of the oxidation states of all atoms or ions in a neutral compound?

Answer 3

Zero

Question 4

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

Answer 4

Metals hydroxide + hydrogen

Question 5

Does Beryllium react with water and steam?

Answer 5

No

Question 6

Does Magnesium react with water and steam?

Answer 6

Yes it reacts with steam and slowly with water

Question 7

What is the equation of Mg reacting with water and steam?

Answer 7

Mg(s) + 2H20(l) —-> Mg(OH)2(aq) + H2(g) (WATER)

Mg(s) + H20(g) —–> MgO(s) + H2(g)

Question 8

Does Calcium react with water and steam?

Answer 8

Yes it reacts with cold water and fizzes

Question 9

What is the equation of Ca reacting with water?

Answer 9

Ca(s) + 2H20(l) —-> Ca(OH)2(aq) + H2(g)

Question 10

Does Strontium react with water or steam?

Answer 10

Yes is reacts vigorously with water

Question 11

What is the equation of Sr reacting with water?

Answer 11

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

Question 12

Does Barium react with water and steam?

Answer 12

Yes it reacts very vigorously with water and a white ppt is formed

Question 13

What is the equation of Ba reacting with water?

Answer 13

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

Question 14

What do group 2 metal react with to form group 2 metal hydroxides?

Answer 14

water

Question 15

Is Mg(OH)2 soluble?

Answer 15

No it is insoluble

Question 16

Is Ca(OH)2 soluble?

Answer 16

Yes it is slightly soluble

Question 17

Is Sr(OH)2 soluble?

Answer 17

Yes

Question 18

Is Ba(OH)2 soluble?

Answer 18

Yes

Question 19

What is ionic equation for all the group 2 metal hydroxides?

Answer 19

Ca(OH)2(s) —-> Ca^2+(aq) + 2OH^-(aq)
Sr(OH)2(s) —> Sr^2+(aq) + 2OH^-(aq)
Ba(OH)2(s) —–> Ba^2+(aq) + 2OH^-(aq)

Question 20

What colour precipitates are group two metal hydroxides?

Answer 20

white

Question 21

Does solubility of group 2 metal hydroxides increase or decrease down the group?

Answer 21

Increases

Question 22

When are group 2 sulfates produced?

Answer 22

when a group 2 metal compound reacts with sulfate ions?

Question 23

What is the ionic equation for the production of calcium sulfate , strontium sulfate and barium sulfate?

Answer 23

Ca^2+(aq) + SO4^2-(aq) —-> CaSO4(s)
Sr^2+(aq) + SO4^2-(aq)—–> SrSO4(s)
Ba^2+(aq) + SO4^2-(aq) —–> BaSO4(s)

Question 24

Does the solubility of group 2 sulfates increase or decrease down the group?

Answer 24

Decrease

Question 25

State the uses of group 2 and explain what it involves?

Answer 25

Extraction of Ti: -titanium is a strong, low density metal that is used in the aerospace industry and replacement hip joints. -It is difficult to extract , normally metals are extracted by reduction with carbon HOWEVER this method produces carbide which is very brittle so titanium oxide is reacted with chlorine and carbon and so the product titanium chloride is reduced with magnesium so we can get pure titanium. Milk of Magnesia: -Mg(OH)2 is an indigestion remedy -It also neutralises stomach acid Barium Sulfate: -insoluble (toxic but safe due to its insolubility) -Barium meal outlines the gut in medical x-rays Calcium hydroxide: -Slaked lime which treats acidic soil