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CHEMISTRY iGCSE > BLAST FURNACE > Flashcards

BLAST FURNACE Flashcards

0
Q

What are the raw materials used in the blast furnace?

A

Hematite (iron ore)
Coke (carbon)
Limestone

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1
Q

What is the purpose of the blast furnace?

A

Extraction of iron

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2
Q

What is the word formula of hematite?

A

Iron (III) oxide

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3
Q

What is the purpose of the coke?

A

Reducing iron oxide to iron metal

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4
Q

What is the purpose of the limestone?

A

Take away impurities in the form of slag

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5
Q

What is the temperature in the blast furnace?

A

1500 degrees

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6
Q

What is the first reaction to take place in the blast furnace in the reduction of iron involving coke?

A

C + O2 –> CO2

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7
Q

What is the second reaction to take place in the blast furnace in the reduction of iron involving the CO2 from the first reaction?

A

CO2 + C –> 2CO

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8
Q

What is the second reaction to take place in the blast furnace involving the CO2 from the first reaction?

A

CO2 + C –> 2CO

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9
Q

What is the third reaction to take place in the blast furnace in the reduction of iron involving carbon monoxide from the second reaction?

A

3CO + Fe2O3 –> 2Fe + 3CO2

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10
Q

What is the useful component of hematite?

A

Iron (III) oxide

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11
Q

What type of reaction is the first reaction in the blast furnace?
(C + O2 –> CO2)

A

Combustion reaction

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12
Q

What type of reaction is the third reaction in the blast furnace?
(3CO + Fe2O3 –> 2Fe + 3CO2)

A

Redox reaction

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13
Q

What is the main impurity in hematite?

A

Silicon dioxide (sand)

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14
Q

What is the chemical formula of silicon dioxide?

A

SiO2

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15
Q

What is the chemical formula of limestone?

16
Q

What is the first reaction in the blast furnace involved in the removal of impurities?

A

CaCO3 –> CaO + CO2

17
Q

What is the second reaction in the blast furnace involved in the removal of impurities, involving the CaO from first reaction?

A

CaO + SiO2 –> CaSiO3

18
Q

What type of reaction is the second reaction in the removal of impurities from the blast furnace?

A

Neutralisation reaction

19
Q

What is the term we use for CaSiO3?

A

Molten slag

20
Q

How do we get rid of the molten slag from the blast furnace?

A

We tap it off

21
Q

Why can we tap off the molten slag?

A

Because it is less dense than the molten iron so will form the top layer.

22
Q

Why do we need to remove the silicon dioxide from the iron?

A

Iron with silicon dioxide in it is brittle.

CHEMISTRY iGCSE (11 decks)

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