Gr 9 NATURAL SCIENCES: CH 4.3 Refining minerals

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What is the primary purpose of refining minerals?

To separate and purify the desired minerals from the ore (correct)

To convert iron into steel

To create a final product with a specific composition

To extract only iron from iron ore

What is the reducing agent used in the early technique of extracting iron?

Iron ore

Limestone

Charcoal (correct)

Coke

What is the approximate percentage of carbon in iron extracted from the blast furnace?

1%

4% (correct)

7%

10%

What is the chemical reaction for the reduction of iron ore in the blast furnace process?

2Fe₂O₃ + 3C → 4Fe + 3CO₂ (D) Signup and view all the answers

What happens to the carbon dioxide gas produced during the refining process?

It escapes as a gas (B) Signup and view all the answers

What is the purpose of hot air blast in the blast furnace process?

To provide the oxygen needed for combustion (A) Signup and view all the answers

What is the purpose of blowing pure oxygen through the molten iron during refining?

To reduce the carbon content (C) Signup and view all the answers

What is the reacting material that forms slag in the blast furnace process?

Limestone (B) Signup and view all the answers

Where is the refined iron sent to after the refining process?

Steel manufacturing plants (B) Signup and view all the answers

What is the final product of the blast furnace process?

Molten iron (A) Signup and view all the answers

What is the primary use of slag in construction?

Building roads (A) Signup and view all the answers

Which country is mentioned as one of the largest producers of iron ore globally?

South Africa (A) Signup and view all the answers

What is the main purpose of the refining process?

To decrease the carbon content of iron (C) Signup and view all the answers

Where is coal distributed to after the blast furnace process?

Coal power stations (B) Signup and view all the answers

What is the primary industry that uses steel?

All of the above (D) Signup and view all the answers

What is the reason for reducing the carbon content in the iron extracted from the blast furnace?

To reduce its brittleness (D) Signup and view all the answers

What is the byproduct of the reaction between carbon and oxygen during the refining process?

Carbon dioxide (C) Signup and view all the answers

What is the primary industry that uses the refined minerals as raw materials?

Multiple industries, including construction and manufacturing (A) Signup and view all the answers

What happens to the molten iron during the refining process?

It is heated and pure oxygen is blown through it (D) Signup and view all the answers

What is the purpose of the blast furnace process?

To extract pure iron from ore (C) Signup and view all the answers

What is the fate of the carbon dioxide gas produced during the refining process?

It escapes into the atmosphere (A) Signup and view all the answers

What is the use of coal in the blast furnace process?

To distribute to power stations (B) Signup and view all the answers

What is the final product sent to steel manufacturing plants?

Refined iron (B) Signup and view all the answers

What is the main difference between the early technique of extracting iron and the modern blast furnace process?

The temperature at which the reaction occurs (C) Signup and view all the answers

What is the purpose of limestone in the blast furnace process?

To form slag (C) Signup and view all the answers

What is the final product of the blast furnace process?

Molten iron (B) Signup and view all the answers

What is the equation for the reduction of iron ore in the early technique of extracting iron?

2Fe₂O₃ + 3C → 4Fe + 3CO₂ (C) Signup and view all the answers

What is the name of the massive structure used in modern iron extraction?

Blast furnace (A) Signup and view all the answers

What is the type of rock that contains iron atoms?

Both A and B (B) Signup and view all the answers

What is the historical period associated with the early techniques of iron extraction?

Iron Age (B) Signup and view all the answers

What is the primary function of the limestone in the blast furnace process?

To react with impurities and form slag (B) Signup and view all the answers

What is the main difference between the reduction of iron ore in the early technique and the blast furnace process?

The temperature of the reaction (D) Signup and view all the answers

What is the purpose of the bloomery in the early technique of extracting iron?

To facilitate the reduction of iron ore using charcoal (D) Signup and view all the answers

What is the primary reason for the use of coke in the blast furnace process?

To facilitate the reduction of iron ore (A) Signup and view all the answers

What is the fate of the molten slag in the blast furnace process?

It is used for road construction (A) Signup and view all the answers

What is the primary advantage of the blast furnace process over the early technique of extracting iron?

It allows for mass production of iron (B) Signup and view all the answers

What is the chemical state of the iron ore before the blast furnace process?

Iron oxide (D) Signup and view all the answers

What is the primary advantage of reducing the carbon content in iron extracted from the blast furnace?

To make iron more suitable for steel-making (C) Signup and view all the answers

What is the primary role of pure oxygen in the refining process?

To react with carbon to form carbon dioxide (C) Signup and view all the answers

What is the primary consequence of not refining the iron extracted from the blast furnace?

The iron becomes too brittle for use (A) Signup and view all the answers

What is the primary purpose of distributing coal to power stations?

To generate electricity for the steel-making process (C) Signup and view all the answers

What is the primary difference between the iron extracted from the blast furnace and the refined iron?

The refined iron has a lower carbon content (B) Signup and view all the answers

What is the primary industry that uses the refined iron as a raw material?

Steel industry (D) Signup and view all the answers

What is the primary reason for the distribution of slag to construction sites?

To use as a building material for roads (A) Signup and view all the answers

What is the primary benefit of using steel in the construction industry?

It increases the strength of buildings (C) Signup and view all the answers

Gr 9 NATURAL SCIENCES: CH 4.3 Refining minerals

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Questions and Answers

What is the primary purpose of refining minerals?

What is the reducing agent used in the early technique of extracting iron?

What is the approximate percentage of carbon in iron extracted from the blast furnace?

What is the chemical reaction for the reduction of iron ore in the blast furnace process?

What happens to the carbon dioxide gas produced during the refining process?

What is the purpose of hot air blast in the blast furnace process?

What is the purpose of blowing pure oxygen through the molten iron during refining?

What is the reacting material that forms slag in the blast furnace process?

Where is the refined iron sent to after the refining process?

What is the final product of the blast furnace process?

What is the primary use of slag in construction?

Which country is mentioned as one of the largest producers of iron ore globally?

What is the main purpose of the refining process?

Where is coal distributed to after the blast furnace process?

What is the primary industry that uses steel?

What is the reason for reducing the carbon content in the iron extracted from the blast furnace?

What is the byproduct of the reaction between carbon and oxygen during the refining process?

What is the primary industry that uses the refined minerals as raw materials?

What happens to the molten iron during the refining process?

What is the purpose of the blast furnace process?

What is the fate of the carbon dioxide gas produced during the refining process?

What is the use of coal in the blast furnace process?

What is the final product sent to steel manufacturing plants?

What is the main difference between the early technique of extracting iron and the modern blast furnace process?

What is the purpose of limestone in the blast furnace process?

What is the final product of the blast furnace process?

What is the equation for the reduction of iron ore in the early technique of extracting iron?

What is the name of the massive structure used in modern iron extraction?

What is the type of rock that contains iron atoms?

What is the historical period associated with the early techniques of iron extraction?

What is the primary function of the limestone in the blast furnace process?

What is the main difference between the reduction of iron ore in the early technique and the blast furnace process?

What is the purpose of the bloomery in the early technique of extracting iron?

What is the primary reason for the use of coke in the blast furnace process?

What is the fate of the molten slag in the blast furnace process?

What is the primary advantage of the blast furnace process over the early technique of extracting iron?

What is the chemical state of the iron ore before the blast furnace process?

What is the primary advantage of reducing the carbon content in iron extracted from the blast furnace?

What is the primary role of pure oxygen in the refining process?

What is the primary consequence of not refining the iron extracted from the blast furnace?

What is the primary purpose of distributing coal to power stations?

What is the primary difference between the iron extracted from the blast furnace and the refined iron?

What is the primary industry that uses the refined iron as a raw material?

What is the primary reason for the distribution of slag to construction sites?

What is the primary benefit of using steel in the construction industry?

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