Inorganic - Group 2

Question 1

what occurs when group 2 metals react?

Answer 1

lose 2 electrons, forming 2+ ions, achieving a full outer shell

Question 2

what is the trend in atomic radius going down group 2? why?

Answer 2

• increases
• due to additional electron shells

Question 3

what is the trend in reactivity down group 2? why?

Answer 3

• increases
• because increased shielding means the outer electrons are lost more easily

Question 4

what is the trend in first ionisation energy down the group? why?

Answer 4

• decreases
• due to greater atomic radius and increased shielding, reducing the electrostatic force

Question 5

what is the trend in melting point going down group 2?

Answer 5

• decrease
• because group 2 elements are metallic so the larger the ions, the weaker the electrostatic force as it has to act over a greater distance

Question 6

in what kind of reaction do group 2 metals react with water?

Answer 6

redox reactions

Question 7

what are the products of a group 2 metal’s reaction with water?

Answer 7

metal hydroxide and hydrogen

Question 8

how does magnesium react with liquid water?

Answer 8

very slowly

Question 9

what is the trend in solubility of group 2 hydroxides down the group?

Answer 9

increases

Question 10

how is magnesium hydroxide used in medicine?

Answer 10

it is an antacid as it is alkaline and so can neutralise acids, treating heartburn

Question 11

how is magnesium hydroxide used in agriculture?

Answer 11

to neutralise acidic soils

Question 12

what is the trend in solubility of group 2 sulphates going down the group?

Answer 12

decreases

Question 13

what is the least soluble group 2 sulphate?

Answer 13

barium sulphate

Question 14

how is barium sulphate used in medicine?

Answer 14

• barium meals
• medical tracer that allow internal tissues and organs to be imaged during x-rays

Question 15

why is barium sulphate safe for use as barium meals in medicine?

Answer 15

it is toxic if it enters the bloodstream but this cannot happen as it is insoluble

Question 16

what use does magnesium have in metal extraction?

Answer 16

used in extraction of titanium from titanium chloride via a displacement reaction

Question 17

what use does calcium oxide have in flue gas removal?

Answer 17

calcium oxide reacts with sulphur dioxide to remove it from factory pollutants and prevent it being released into the atmosphere

Question 18

what are the products of flue gas removal by calcium oxide?

Answer 18

calcium sulphite and water