Chemistry 0620 · IGCSE · Simple molecules and covalent bonds
Simple molecules and covalent bonds — practice question
The diagram illustrates part of the arrangements of sodium chloride and pentane at room temperature and pressure.
(a)[5]
Describe how these substances differ in physical properties with reference to:
• volatility
• solubility in water
• electrical conductivity when molten (liquid).
(b)[1]
Name the gas formed at the positive electrode.
(c(i))[1]
State the condition under which pentane forms carbon monoxide.
(c(ii))[1]
State one harmful effect of carbon monoxide on health.
Worked solution & mark scheme
This 8-mark question has a full step-by-step worked solution and mark scheme. One marking point: “sodium chloride: very low volatility / does not evaporate at room temperature” …