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Flashcards in Group 2 Deck (20)
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1
Q

What do the ions of group 2 react to form?

A

Ions with a 2+ charge.

2
Q

What is the trend in atomic radius?

A

Increases down the group

3
Q

What is the trend in ionisation energies?

A

Decreases, atomic radius increases so more shielding and less attraction from the nucleus to the delocalised electrons.

4
Q

What is the trend in the strength of the metallic bonding?

A

Decreases going down the group as atomic radius increases attraction between electrons and positive ions decreases.

5
Q

What is the trend in reactivity?

A

Increases going down the group as it gets easier to lose their outer electrons.

6
Q

Do group 2 metals act as oxidising or reducing agents?

A

Reducing agents as they donate electrons.

7
Q

How does magnesium react with water?

A

Mg + 2H2O –> Mg(OH)2 + H2

8
Q

How does magnesium react with steam?

A

Mg + H2O –> MgO + H2

9
Q

How do calcium, strontium and barium react with water?

A

Ca + 2H2O –> Ca(OH)2 + H2

10
Q

What is the trend in solubility of group 2 sulfates?

A

Decreases down the group

11
Q

What is the trend in solubility of group 2 hydroxides?

A

Increases down the group.

12
Q

What is a use for magnesium hydroxide?

A

Neutralises stomach acid.

13
Q

What is a use for calcium hydroxide?

A

Lime water.

14
Q

What is a use for barium sulfate?

A

Used to line the gut to take an x-ray.

15
Q

How would you test for sulfate ions in solution?

A

Acidify the solution with nitric or hydrochloric acid, then barium chloride is added to the solution. If a sulfate is present then a white precipitate of barium sulfate is formed.

16
Q

What is the equation for the extraction of titanium?

A

TiCl4 + 2Mg –> 2MgCl2 + Ti

17
Q

Outline the practical steps to determine the soubility of Ca(OH)2.

A

Take a known volume of the saturated solution. Evaporate the filtrate to dryness. Weigh the residue.

18
Q

What is the equation for the thermal decomposition of ZnCO3 to ZnO?

A

ZnCO3 –> ZnO + CO2

19
Q

How could you remove soluble impurities from a sample of Mg(OH)2?

A

Wash with water.

20
Q

Give one advantage of using Mg(OH)2 rather than MgCO3 to reduce acidity int he stomach.

A

Does not produce CO2.