Chem (Extraction of metals)

Question 1

Adavntages of using scrap metal as opposed to metal extraction?

Answer 1

• lower energy costs
• Doen’t use up valuable ores
• Recyled metal-still retain properties indefinitely
• waste going to landfill is reduced- less damage to environment
• carbon emission reduced/pollution

Question 2

Advantages of using metal extraction instead of reduction by carbon monoxide?

Answer 2

Blast Furnace-high enrgy costs
Aqeuous solution- lower temperature
Blast Furnace- emissions of C02/air and water pollution

Question 3

Metal extraction using aqueous soltion use..?

Answer 3

low-grade ores

Question 4

Extraction of aluminium- main ore is..?

high % of ..?

Answer 4

bauxite

Al203

Question 5

Why is olten cryloite added in with the Al203 during electrolysis?

Answer 5

because it reduces the melting point from 2000 degrees to 900 degrees
easier to melt
reduces energy costs

Question 6

What is reduced in extraction of aluminium?

Answer 6

Al3+ + 3e- > Al

Question 7

What is oxidisied in the extraction of aluminium?

Answer 7

202- > 02 + 4e-

oxygen is always oxidised

Question 8

What are high enrgy costs due to and ho doy uo reduce them?

Answer 8

Electricity process

Red Mud Waste>landfills

Question 9

Extraction of Titanium- main ore

Answer 9

Ti02

Question 10

Why can’t you displace it with carbon? and what do you do with it instead?

Answer 10

because it priduces a useless brittle metal, TiC

heat it with chlorine gas, Cl2 to make TiCl4

Question 11

What do you react titanium chloride with to make the titanium metal?

Answer 11

TiCl4 + 2Mg > Ti + MgCl

TiCl4 + 2Na > Ti + NaCl

Question 12

Why do yuo use an inert atmosphere of argon gas for ttinaium extraction?

Answer 12

So the metals don’t react with 02 in the air

Question 13

Why is titianum production expensive?

Answer 13

Kroll process is expensive to operate
Cl2 is expensive to produce
Ti is more expensive to produce than stainloess steel

Question 14

Old processes of extracting cooper means.?@

Answer 14

S02 emissions- acid rain

Question 15

Sulfuric acid can eb manufatured by :

Answer 15

S02 + H20 > H2S03

H2S03 + 1/2 02 > H2S04 (suluric Vl acid-common one)

Question 16

Contact process is:

Answer 16

S02 > (heat and a catalyst of V205) makes S03

S03 + H20 > H2S04

Question 17

Ca0 can react with S02 to produce..?

Answer 17

CaS03 (plaster in buildings)

Question 18

How to extract tungsten

Answer 18

W03 + C WC (useless brittle metal)

W03 + H2 > W + H20

Question 19

Conditons and costs for tungsten extraction?

Answer 19

700-1000 degrees- high risk of explosion/high enrgy costs

Question 20

Uses of tungsten?

Answer 20

lightbulb filaments

artifical hip joints