S = Iron Extraction

Question 1

Name and formula of the common iron ore?

Answer 1

Hematite (mostly Fe2O3 + some impurities)

Question 2

Steps of iron extraction + the equations not including the purification steps (3)

Answer 2

1. Coke(carbon) is burnt to give off heat

C + O2 –> CO2

2. Carbon monoxide is made

C + CO2 –> 2CO

3. Iron(III) oxide is reduced

Fe2O3 + 3CO –> 2Fe + 3CO2

Question 3

Steps and equations to the purification steps (2)

Answer 3

1.Break down limestone in the furnace

CaCO3 –> CaO + CO2

2.CaO (lime) reacts with the sand that’s made of mainly silicon dioxide to make slag (calcium silicate)

CaCO3 + SiO2 –> CaSiO3

Question 4

Role of CaCO3?

Answer 4

Removes impurities

Question 5

Name, Chemical name and formula of the impurity formed.

How is it tapped off?

Answer 5

Slag is known as Calcium silicate (CaSiO3)

It’s less dense than molten iron so it floats on top of the molten iron and is then tapped off.

Question 6

Name the reducing agent?

Answer 6

Carbon monoxide (CO)