(a(i))[1]
State which gas makes damp red litmus paper turn blue.
(a(ii))[1]
State which gas is involved in the formation of acid rain.
(a(iii))[1]
State which gas is a hydrocarbon that contributes to climate change.
(a(iv))[1]
State which gas is produced when copper(II) carbonate reacts with hydrochloric acid.
(a(v))[1]
State which gas is monatomic and has atoms with the electronic structure 2,8,8.
(b(i))[1]
Explain why party balloons are filled with helium rather than hydrogen.
(b(ii))[1]
Give one application of argon.
(c)[1]
Carbon dioxide is a compound. What does the term compound mean?
(d)[2]
Complete the dot-and-cross diagram so that it shows the electron arrangement in a molecule of ammonia. Show only outer-shell electrons.