Chemistry 9701 · AS & A Level · The Periodic Table: chemical periodicity
The Periodic Table: chemical periodicity — practice question
Copper, proton number 29, and argon, proton number 18, are elements that differ in both physical and chemical properties. When solid, each one has the same face-centred cubic crystal structure, as shown below. The particles in such a crystal can be atoms, molecules, anions or cations. In the diagram above, the particles are shown by ●.
(a)[2]
What type of particle is found in the copper crystal and in the argon crystal? For each one, state its formula.
(b)[4]
At room temperature copper is solid whereas argon is a gas. Explain these results in terms of the forces in each structure.
(c(i))[1]
How does chlorine act in its reaction with copper?
(c(ii))[1]
Suggest a reason why argon does not react with chlorine.
(d)[2]
The melting points of the noble gases from neon to xenon are shown below: Ne $25\,\text{K}$, Ar $84\,\text{K}$, Kr $116\,\text{K}$, Xe $161\,\text{K}$. Explain why the melting point rises from neon to xenon.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Copper named as a cation with formula $\text{Cu}^{2+}$ (or $\text{Cu}^+$)” …