10 & 27: Group 2 ❎

Question 1

What is the trend in

solubility of Group 2 hydroxides?

Answer 1

down the group, solubility of Group 2 hydroxides increases

Question 2

What is the trend in

reactivity in Group 2?

Answer 2

down the group, reactivity increases

Question 3

Which two Group 2 elements also form MO₂?

Answer 3

Sr and Ba

Question 4

2Mg + O₂

observations

Answer 4

burns easily with a bright white flame

Question 5

2Ca + O₂

observations

Answer 5

difficult to ignite, red flame

Question 6

2Sr + O₂

observations

Answer 6

difficult to ignite, red flame

Question 7

2Ba + O₂

observations

Answer 7

difficult to ignite, green flame

Question 8

General formula for

Group 2 + H₂O

Answer 8

M + 2H₂O → M(OH)₂ + H₂

Question 9

General formula for

Group 2 + HCl

Answer 9

M + 2HCl → MCl₂ + H₂

Colourless metal chloride solutions are formed

Question 10

Mg + 2H₂O

speed

Answer 10

with steam → vigorous reaction
with water → slow reaction

Question 11

General formula for

the thermal decomposition of Group 2 nitrates

Answer 11

2M(NO₃)₂ → 2MO + 4NO₂ + O₂

Question 12

Describe the trend in

alkalinity of hydroxides down Group 2

Answer 12

down the group, alkalinity of hydroxides increases

Question 13

Explain the trend in

alkalinity of hydroxides down Group 2

Answer 13

• down the group, solubility of hydroxides increases
• concentration of OH- ions that dissociate in solution increases
• this increases the pH of the solution

Question 14

CaO + H₂O

observations

Answer 14

• vigorous reaction
• some water boils off
• solid lump expands and opens up

Question 15

Trend in

solubility of Group 2 sulfates

Answer 15

down the group, solubility of sulfates decreases