(a(i))[1]
State the oxygen percentage in clean, dry air.
(a(ii))[2]
Complete Fig. 2.1 by drawing the dot-and-cross diagram for a water molecule. Show only outer shell electrons.
(a(iii))[1]
State the name of the polymer made from ethene.
(a(iv))[1]
Complete this sentence about polymers. Polymers are large molecules assembled from many smaller molecules called [BLANK].
(b(i))[2]
State two physical characteristics of ionic compounds.
(b(ii))[1]
Select the statement that best describes ionic bonding. Tick one box. It is a weak electrostatic attraction linking anions and cations. It is a weak electrostatic attraction between cations only. It is a strong electrostatic attraction between anions only. It is a strong electrostatic attraction joining cations and anions.