2.2 Group 2

Question 1

What are the properties of group 2 elements?

Answer 1

High melting points
Harder and higher density than group 1
Reactive metals with similar chemical reactions

Question 2

What are the trends down group 2?

Answer 2

Atomic radius increases
FIE decreases
Melting point decreases
Reactivity increases

Question 3

How does Magnesium react with:
Cold water
Steam

Answer 3

Effervescence

White flame + white solid MgO formed

Question 4

How does Calcium react with:

Cold water

Answer 4

Effervescence + cloudy solution formed

Question 5

How does Strontium react with:

Cold water

Answer 5

Effervescence + white solid

Question 6

How does Barium react with:

Cold water

Answer 6

Effervescence + colourless solution

Question 7

Reaction of Titanium oxide with chlorine and carbon

Answer 7

2C + TiO2 + 2Cl2 = TiCl4 + 2CO

Question 8

Reduction to produce Titanium

Answer 8

TiCl4 + 2Mg = Ti + 2MgCl2

Question 9

How does the solubilty and pH of group 2 hydroxide change down the group?

Answer 9

Increases

Question 10

How does the solubilty of group 2 sulfates change down the group?

Answer 10

Decreases

Question 11

Use of Barium salts?

Answer 11

Add 1cm3 of HCl to remove ions that might interfere

Add 1cm3 of BaCl2 - if SO4 2- ions present a percipitate of BaSO4 is present

Question 12

Use of Magnseium salts?

Answer 12

Add 1cm3 of MgCl2 - if OH- ions present a white percipitate of Mg(OH)2 will be seen

Question 13

Use of Calcium compounds?

Answer 13

Remove sulfur dioxide from flue gas
CaO + SO2 = CaSO3
CaCO3 + SO2 = CaSO3 + CO2