The diagram below shows most of the substances used in the blast furnace to produce iron.



The mixture containing iron ore and coke put into the blast furnace also contains Substance X.
What is Substance X?

1.   ?    Bauxite
2.   ?    Cryolite
3.   ?    Limestone
4.   ?    Sulphur

The diagram below shows most of the substances used in the blast furnace to produce iron.



Which element does the coke provide for the reactions in the blast furnace?

1.   ?    Carbon
2.   ?    Iron
3.   ?    Oxygen
4.   ?    Sulphur

The diagram below shows most of the substances used in the blast furnace to produce iron.



The hot air is blasted into the furnace to...

1.   ?    ...circulate and throughly mix the iron ore and coke.
2.   ?    ...react with the coke and release energy.
3.   ?    ...react with the iron ore.
4.   ?    ...sweep out the waste gases.

The diagram below shows most of the substances used in the blast furnace to produce iron.



Which two substances collect at the bottom of the furnace?

1.   ?    Molten iron floating on molten slag.
2.   ?    Molten slag floating on molten iron.
3.   ?    Molten slag floating on solid iron.
4.   ?    Solid slag floating on molten iron.

Iron, in the form of steel, is used to make underground pipelines to carry oil and gas.



Iron (steel) will corrode faster than most other transition metals because...

1.   ?    ...it combines with carbon dioxide in the air.
2.   ?    ...it does not have a shiny surface.
3.   ?    ...it only has a thin oxide layer.
4.   ?    ...it reacts more quickly with oxygen and water.

Iron, in the form of steel, is used to make underground pipelines to carry oil and gas.



The magnesium bars are attached to the iron...

1.   ?    ...to neutralise acid solutions in the soil.
2.   ?    ...to neutralise alkaline solutions in the soil.
3.   ?    ...to prevent the pipes sinking further into the ground.
4.   ?    ...to stop the iron (steel) corroding.

Iron, in the form of steel, is used to make underground pipelines to carry oil and gas.



Why would you expect aluminium to corrode more quickly than iron?

1.   ?    Aluminium is above iron in the reactivity series.
2.   ?    Aluminium is softer than iron.
3.   ?    Aluminium is less dense than iron.
4.   ?    Aluminium is not a transition metal.

Corrosion of aluminium is actually very slow compared to iron because...

1.   ?    ...it does not react with oxygen and water.
2.   ?    ...it has a shiny surface.
3.   ?    ...it is above iron in the reactivity series.
4.   ?    ...it is protected by a thin oxide layer.