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Flashcards in EXTRACTION OF IRON Deck (18)
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1

Why don't we use electrolysis for the extraction of iron?

Because Iron is less reactive than carbon so can be reduced.

2

What is the ore of iron.

Hematite.

3

Where does the extraction of iron occur?

In a blast furnace.

4

What are the 4 raw material needed for the extraction of iron?

1) Ore
2) Coke (Carbon)
3) Limestone (Calcium Carbonate)
4) Air

5

Which settles in the bottom, molten Iron or slag? Why?

Molten iron is more dense so it settles in the bottom.

6

What is the first reaction that takes place during the extraction?

C (s) + O2 (l) ----> CO2 (g)
(Carbon (coke) reacts with oxygen to form carbondioxie)

7

What type of reaction is this?
C (s) + O2 (l) ----> CO2

An exothermic reaction which increases the temperature of the blast furnace.

8

What is the second reaction that takes place?

CO2 (g) + C (s) ----> 2CO (g)
Carbon dioxide reacts with more carbon to form Carbon monoxide.

9

What type is this reaction?
CO2 (g) + C (s) ----> 2CO (g)

Endothermic reaction

10

What is the third reaction that takes place?

Fe2O3 (s) + 3CO (g) ----> 2Fe (l) + 3CO2 (g)
Carbon monoxide reduces the iron oxide (iron ore) to make molten iron.

11

What undergoes reduction and what undergoes oxidation in the following reaction:
Fe2O3 (s) + 3CO (g) ----> 2Fe (l) + 3CO2 (g)

Reduction: Fe2O3

Oxidation: CO

12

What is the name of this reaction?
Fe2O3 (s) + 3CO (g) ----> 2Fe (l) + 3CO2 (g)

Redox reaction

13

What happens to limestone?

It breaks down thermally to form lime and carbon dioxide.
CaCO3 ----> CaO + CO2

14

What is the name of this reaction?
CaCO3 ----> CaO + CO2

Thermal decomposition

15

What does lime do?

It reacts with impurities such as silicon dioxide (sand) to form slag (Calcium silicate)
CaO + SiO2 ----> CaSiO3

16

What is the name of this reaction?
CaO + SiO2 ----> CaSiO3

Neutralization reaction

17

What is the role of lime?

To neutralize

18

Which one is basic and which one is acidic?
CaO + SiO2 ----> CaSiO3

CaO: Basic
SiO2: Acidic