Chapter 9 : alkaline metals done

Question 1

What group are alkaline metals

Answer 1

group 2

Question 2

Trend in BP in group 2

Answer 2

Get lower
Bigger ions as you go down
nucleus further away from the the delocalised electrons so less attraction

Question 3

Trend in solubility of Hydroxides formed?

Answer 3

Gets more soluble as you go down the group

Question 4

Trend in solubility of Sulphates formed?

Answer 4

Solubility increases as you go down the group

Question 5

How would you test for sulfate ions in solution

Answer 5

Add hcl
Use aqueous BaCl2 and add it to the solution
BaCl will be displaced and BaSO4 will be formed
really insoluble so white precipiate formed.
BaCl2 + Na2SO4 → BaSO4 + 2NaCl
Ba2+(aq) + SO42-(AQ)—–BaSO4(S)

Question 6

Trend in reactivity with water down the group?

Answer 6

It increases
electrons further away from nucleus
less attraction

Question 7

Whats MgOH2 used for in medicine?

Answer 7

Its used as an antacid

Question 8

How is titanium extracted

Answer 8

titanium oxide is reated with chlorine
titanium choride is reacted with mg
(TiCl4(l) + 2Mg(s)——-2MgCl2(s) + Ti(s)

Question 9

Trend in 1st ionisation energy down the group 2?

Answer 9

Decreases as they get further away from the nucleus so less attraction and more shielding

Question 10

How is barium sulfate used in medicine?

Answer 10

As barium meals for x rays.

Not harmful as insoluble

Question 11

what is the reaction between an alkali metal and water?

Answer 11

M(s) + h2o(l)====== m(oh)2(aq) + H2(g)

but is steam is used. MO(s) is made.