State which letter on the diagram, B, C, D or E, indicates the point where air is blown into the furnace.
Complete the chemical equation showing the reduction of iron(III) oxide in the blast furnace.\nFe$_2$O$_3$ + 3C $\rightarrow$ .....Fe + .....CO
Explain how this equation demonstrates that iron(III) oxide is reduced.
Complete the word equation to show this reaction.\ncalcium carbonate $\rightarrow$ ............... + ...............
Use the information in the diagram to suggest why molten slag is less dense than molten iron.
A gas is blown through the molten iron. The name of this gas is ................. .\nAcidic gases are produced. These acidic gases react with ................. ................. .
State one application of mild steel.
Deduce how many electrons, neutrons and protons are present in one atom of this chromium isotope.
Give two other physical properties of chromium that are common to all metals.