Reactivity Trends

Question 1

Group 2 reactions with H20

Answer 1

• Produces Hydrogen gas and Metal hydroxide

* M(OH)2

Question 2

Group 2 reactions with Oxygen

Answer 2

• Needs to be heated

* Produces Metal oxide

Question 3

Group 2 reactions with Dilute Acids

Answer 3

•Produces a Salt and Hydrogen gas

Question 4

Displacement reaction of Cl2 in H20

Answer 4

Pale green solution

Question 5

Displacement reaction of Cl2 in Cyclohexane

Answer 5

Pale green solution

Question 6

Displacement reaction of Br2 in H20

Answer 6

Orange solution

Question 7

Displacement reaction of Br2 in Cyclohexane

Answer 7

Orange solution

Question 8

Displacement reaction of I2 in H20

Answer 8

Brown solution

Question 9

Displacement reactions of I2 in Cyclohexane

Answer 9

Violet

Question 10

CARBONATE TEST

Answer 10

1) Add Nitric acid (aq)
•If a carbonate ion is present CO2 will form

2) To determine if the gas is really CO2, Bubble solution through Limewater Ca(OH)2
•If the gas is CO2 the limewater will turn cloudy due to a white precipitate of CaCO3 in H20.

Question 11

SULFATE TEST

Answer 11

1) Acidify solution with HCL

2) Add Barium Chloride
•If sulfate ions are present a white precipitate of BaSO4 will form

Question 12

AMMONIUM TEST

Answer 12

1) Add NaOH to solution
2) Heat solution

3) Test the gas formed with litmus paper
•If litmus paper turns blue the Ammonium ions are present

Question 13

HALIDE ION TEST

Answer 13

1) Add (aq) Silver nitrate to solution
•If a white precipitate is formed then Cl- ions are present
•If a cream precipitate is formed then Br- ions are present
•If a yellow precipitate is formed then I- are present

2) To distinguish between Br- and I- Add concentrated NH3
•If precipitate dissolves then Br- are present
•If precipitate does not dissolve then I- are present