(a(i))[1]
Deduce the mass percentage of the other elements in the oceans.
(a(ii))[1]
State which non-metallic element occurs in the whole Earth at the highest percentage by mass.
(a(iii))[2]
Give two major composition differences between the whole Earth and the oceans.
(b)[2]
Complete the diagram so that it shows the electron arrangement in a chlorine atom.
(c(i))[1]
Explain why air is blown into the blast furnace.
(c(ii))[1]
Complete the equation for this reaction. $\text{CO}_2 + C \rightarrow \ldots \text{CO}$
(c(iii))[1]
State the meaning of the term reduction.
(c(iv))[1]
Calculate the smallest mass of iron(III) oxide required to make 14 g of iron.
(d(i))[2]
Select two substances from the list that are used when iron from the blast furnace is converted into steel.
(d(ii))[1]
State the meaning of the term alloy.