Group 2

Question 1

Mg2 + H2O (l) —>

Answer 1

Mg(OH)2 + H2

Question 2

Ca + H2O (l) —>

Answer 2

Ca(OH)2 + H2

Question 3

Mg + H2O (g) —>

Answer 3

MgO + H2

Question 4

Which is the least soluble group 2 hydroxide?

Answer 4

Mg(OH)2

Question 5

Which is the least soluble group 2 sulphate?

Answer 5

BaSO4

Question 6

What is the test for sulphate ions?

Answer 6

BaCl2

Question 7

What is observed when BaCl2 is added to CaSO4?

Answer 7

White precipitate (BaSO4 is formed)

Question 8

What is the medical use of barium sulphate?

Answer 8

Stomach X-rays

Question 9

Give a use for magnesium hydroxide?

Answer 9

To neutralise stomach acid

Question 10

Magnesium chloride can be used to test the presence of which negative ions?

Answer 10

OH-

Question 11

State the trend in reactivity with water down group 2?

Answer 11

Increases

Question 12

What is observed when ba reacts with water?

Answer 12

Colourless solution+ effervescence

Question 13

The student noticed that some liquid injected into the gas syringe did not vaporise.
Explain the effect this has on the Mr calculated by the student?

Answer 13

Calculated Mr would be greater then expected as volume recorded would be lower

Question 14

Mg(OH)2 is the most or least soluble?

Answer 14

Least