Group 2 Compounds Flashcards Preview

Y12 AS Chemistry > Group 2 Compounds > Flashcards

Flashcards in Group 2 Compounds Deck (16)
Loading flashcards...
1
Q

When group 2 elements react, what are they oxidised from and to ?

A

0 to +2

2
Q

What is produced when group 2 metals react with water?

A

Metal hydroxide

Hydrogen

3
Q

Why do elements react more readily down the group?

A

The ionisation energies decrease

4
Q

What is the solubility of group 2 hydroxides?

A

Solubility increases

5
Q

What is the solubility of group 2 sulfates?

A

Solubility decreases

6
Q

What is the most insoluble group 2 compound?

A

BaSO4

7
Q

What is barium sulfate useful in? How does this work?

A

Medicine - X-Rays (barium meals)
Barium sulfate is opaque to X-Rays so the patient swallows the barium meal which coats the tissues and causes them to show up on the X-ray

8
Q

What is used in the extraction of titanium?

A

Magnesium

9
Q

How is titanium extracted?

A

The main ore, titanium(IV) oxide (TiO2) is first converted to titanium(IV) chloride (TiCl4) by hearing it with carbon in a steam of chlorine gas.
Titanium chloride is then purified by fractional distillation, before being reduced by magnesium in a furnace at 1000 degrees Celsius

10
Q

What is the overall reaction of the extraction of titanium?

A

TiCl4 + 2Mg -> Ti + 2MgCl2

11
Q

How is acidic sulfur dioxide can be removed from flue glasses? What is this process called?

A

Reacting with an alkali

Wet scrubbing

12
Q

What can be used for wet scrubbing?

A

A slurry made by mixing the calcium oxide or calcium carbonate with water

13
Q

What waste product is made when sulfur dioxide reacts with the alkaline slurry?

A

Calcium sulfite

14
Q

What are the reactions for the removal of sulfur dioxide from flue gases?

A

CaO + 2H2O + SO2 -> CaSO3 + 2H2O

CaCO3 + 2H2O +SO2 -> CaSO3 + 2H2O +CO2

15
Q

What is a use of calcium hydroxide?

A

Neutralise acidic soils in agriculture

16
Q

What is a use for magnesium hydroxide?

A

Indigestion tablets to neutralise stomach acid