2.2 Group 2

Question 1

Complete the equation

Mg + H2O(l) –>

Answer 1

Mg(OH)2 + H2

Question 2

Give the ionic equation for the reaction between MgCl₂ and NaOH.

Answer 2

Mg²⁺ + 2 OH^- → Mg(OH)₂

Question 3

Give the ionic equation for the reaction between BaCl₂ and H₂SO₄.

Answer 3

Ba²⁺ + SO₄^2- → BaSO₄

Question 4

Complete the equation

Ca + H2O(l) –>

Answer 4

Ca(OH)2 + H2

Question 5

Complete the equation

Mg + H2O(g) –>

Answer 5

MgO + H2

Question 6

Which is the least soluble Group 2 hydroxide?

Answer 6

Mg(OH)2

Sparingly Soluble

Question 7

Which is the most soluble Group 2 hydroxide?

Answer 7

Ba(OH)2

Question 8

Which is the least soluble Group 2 sulfate?

Answer 8

BaSO4

Question 9

Which is the most soluble Group 2 sulfate?

Answer 9

MgSO4

Question 10

What is the test for sulfate ions?

Answer 10

Acidified BaCl2

Question 11

What is observed when BaCl2 is added to CaSO4

Answer 11

White precipitate

BaSO4 is formed

Question 12

What is observed when barium chloride is added to sulfuric acid?

Answer 12

White precipitate

BaSO4 is formed

Question 13

Give a medical use of barium sulfate.

Answer 13

Used to X-ray stomach (absorbs X-rays)

‘Barium meal’

Question 14

Give a use for magnesium hydroxide

Answer 14

To neutralise stomach acid

Treating indigestion

Question 15

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

Answer 15

Hydroxide ions (OH-)

Mg(OH)2 will form giving a white precipitate

Question 16

What is observed when MgCl2 is added to NaOH?

Answer 16

White precipitate

Mg(OH)2 is formed
Mg(OH)2 is sparingly soluble

Question 17

State the trend in reactivity with water down group 2

Answer 17

Reactivity increases

Mg is least reactive, Ba is most reactive

Question 18

What group 2 trend increase down the group?

Answer 18

Atomic radius

Question 19

What type of bonding do all group 2 elements have?

Answer 19

Metallic

Question 20

What is observed when Ba reacts with water?

Answer 20

A colourless solution and effervesence (fizzing)

Question 21

Which compound is used to treat the symptoms of indegestion?

Answer 21

Mg(OH)2

Magnesium hydroxide

Question 22

Why is magnesium hydroxide (Mg(OH)₂) safer to use than sodium hydroxide (NaOH) for treating indigestion?

Answer 22

Magnesium hydroxide is sparingly soluble

Question 23

What products are formed when magnesium reacts with steam?

Answer 23

Magnesium Oxide and Hydrogen

MgO +H2

Question 24

Write the equation for the extraction of titanium metal from titanium (IV) chlorde using magnesium.

Answer 24

2 Mg + TiCl₄ → 2 MgCl₂ + Ti

Question 25

Give the role of magnesium in the extraction of titanium from titanium (IV) chloride.

Answer 25

Reducing agent (oxidation state changes from 0 to +2)

Question 26

Give the role of titanium in the extraction of titanium from titanium (IV) chloride.

Answer 26

Oxidising agent (oxidation state changes from +4 to 0)