(a(i))[1]
Deduce the mass percentage for the other elements in the whole Earth.
(a(ii))[1]
State which element makes up the largest mass percentage in the whole Earth.
(a(iii))[2]
Give two main differences in the composition of the whole Earth and the Earth’s crust.
(b)[2]
Complete the diagram so that it shows the electron arrangement in a calcium atom.
(c(i))[1]
Name a type of iron ore.
(c(ii))[2]
Complete the chemical equation for the reaction shown below. $\mathrm{Fe_2O_3 + 3CO \rightarrow \ldots\ldots Fe + \ldots\ldots CO_2}$
(c(iii))[2]
State what is meant by the term thermal decomposition.
(c(iv))[1]
Choose the correct statement about calcium oxide’s reaction in the blast furnace. Tick (✓) one box.
(c(v))[1]
State one benefit of recycling iron.