Unit 14 - making use of metals

Question 1

What is a bauxite

Answer 1

Aluminium oxide

Question 2

Which method is used to extract very reactive metal from its ore

Answer 2

electrolysis

Question 3

A disadvantage of electrolysis

Answer 3

Expensive

Question 4

What is zinc blende

Answer 4

zinc sulfide, ZnS

Question 5

a word equation of extraction of iron ore

Answer 5

iron (iii) oxide + carbon monoxide = iron + carbon dioxide

Question 6

How is zinc extracted from zinc blende

Answer 6

It is roasted in air to produced zinc oxide and sulfur dioxide. Then zinc oxide is reacted with carbon monoxide to form zinc and carbon dioxide

Question 7

What is hematite

Answer 7

Iron ore

Question 8

What is in the charge ( the mixture)

Answer 8

Iron ore, limestone , coke

Question 9

What is coke ( not drink )

Answer 9

pure carbon ( coal )

Question 10

Describe the reactions in the blast furnace

Answer 10

The coke is burned in the air to produce carbon dioxide and heat.
carbon dioxide is reacted with even more carbon to produce carbon monoxide
Then iron (iii) oxide is reacted with carbon monoxide to form iron and carbon dioxide.

Question 11

What are the wasted gases in the blast furnace

Answer 11

Carbon dioxide and nitrogen

Question 12

how is limestone used for during the process of extraction of iron

Answer 12

Limestone is broken down into calcium oxide and carbon dioxide by the heat of the furnace. Then calcium oxide reacts with the sand to form a slag( calcium silicate ) so that it removes impurities in the iron ore.

Question 13

What kind of anode and cathode are used in the electrolysis of aluminium

Answer 13

carbon

Question 14

The aluminium ore is dissolved in ________ during electrolysis

Answer 14

Molten cryolite

Question 15

The overall reaction of electrolysis of aluminium

Answer 15

aluminium oxide = aluminium + oxygen

Question 16

Uses for aluminium

Answer 16

cooking foil, drinking cans

Question 17

Uses for copper

Answer 17

electrical wiring

Question 18

Uses of zinc

Answer 18

galvanising

Question 19

What is brass

Answer 19

alloy of copper and zinc

Question 20

Which substances are mixed with iron to form stainless steel

Answer 20

nickel and chromium

Question 21

Effect of amount of carbon content in the steel

Answer 21

A little carbon make steel stronger but too much make it brittle

Question 22

Why do alloy has a different property

Answer 22

A new atom enters the lattice so that the layers can no longer slide easily. This makes the alloy stronger than the original metal

Question 23

how is zinc removed after the extraction from zinc blende to zinc

Answer 23

fractional distillation

Question 24

how is steel made

Answer 24

molten iron is poured into basic oxygen converter
the oxygen reacts with the carbon and sulfur to form CO2 and SO2
the gases goes off reacts with phosphorus to form phosphorus (V) oxide ( P2O5)
calcium oxide is added to react with silicon and phosphorus (V) oxide.
this gives a slag which is skimmed off

Question 25

what enters at the bottom of the blast furnace

Answer 25

blast of hot air

Question 26

what leavesat the bottom of the blas furnace

Answer 26

molton iron