Chem (Extraction of metals) Flashcards Preview

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Flashcards in Chem (Extraction of metals) Deck (20)
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1
Q

Adavntages of using scrap metal as opposed to metal extraction?

A
  • 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
2
Q

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

A

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

3
Q

Metal extraction using aqueous soltion use..?

A

low-grade ores

4
Q

Extraction of aluminium- main ore is..?

high % of ..?

A

bauxite

Al203

5
Q

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

A

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

6
Q

What is reduced in extraction of aluminium?

A

Al3+ + 3e- > Al

7
Q

What is oxidisied in the extraction of aluminium?

A

202- > 02 + 4e-

oxygen is always oxidised

8
Q

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

A

Electricity process

Red Mud Waste>landfills

9
Q

Extraction of Titanium- main ore

A

Ti02

10
Q

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

A

because it priduces a useless brittle metal, TiC

heat it with chlorine gas, Cl2 to make TiCl4

11
Q

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

A

TiCl4 + 2Mg > Ti + MgCl

TiCl4 + 2Na > Ti + NaCl

12
Q

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

A

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

13
Q

Why is titianum production expensive?

A

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

14
Q

Old processes of extracting cooper means.?@

A

S02 emissions- acid rain

15
Q

Sulfuric acid can eb manufatured by :

A

S02 + H20 > H2S03

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

16
Q

Contact process is:

A

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

S03 + H20 > H2S04

17
Q

Ca0 can react with S02 to produce..?

A

CaS03 (plaster in buildings)

18
Q

How to extract tungsten

A

W03 + C WC (useless brittle metal)

W03 + H2 > W + H20

19
Q

Conditons and costs for tungsten extraction?

A

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

20
Q

Uses of tungsten?

A

lightbulb filaments

artifical hip joints

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