(a(i))[1]
State one effect caused by an increase in the atmospheric concentration of carbon dioxide and methane.
(a(ii))[1]
State one source from which methane gas comes.
(a(iii))[1]
State one additional environmental effect caused by CFCs in the atmosphere.
(b)[1]
Draw the dot-and-cross diagram to illustrate the bonding in a molecule of CCl$_3$. Show only the outer-shell electrons.
(c(i))[1]
Describe the chemical reaction occurring inside a car engine that produces nitric oxide, NO.
(c(ii))[2]
Describe the redox reactions that occur inside a catalytic converter.
(d)[1]
Two moles of nitrogen dioxide react with one mole of water to produce an aqueous mixture containing only two acids. One of the acids is nitric acid. Deduce the formula of the other acid.