(a)[2]
Describe two physical properties that are typical of non-metals.
(b(i))[1]
Fill in Fig. 8.1 with the dot-and-cross diagram for a methane molecule. Display only outer-shell electrons.
(b(ii))[1]
Methane belongs to the alkane homologous series. State the general formula of alkanes.
(b(iii))[1]
Methane is an air pollutant. State one source that adds methane to the air.
(b(iv))[1]
State one harmful effect of methane in the air.
(b(v))[1]
Name one other compound formed during the incomplete combustion of methane.
(c(i))[1]
From the list, select the pH value that is acidic: pH 4, pH 7, pH 9, pH 13.
(c(ii))[2]
State two ways of reducing acid rain.
(c(iii))[3]
The glass plate is taken away. Initially, the filter paper stays purple. After a short time, it becomes colourless. Explain these observations using the kinetic particle theory.