CIE iGCSE Co-Ordinated Science C11.4 Alkanes Exam Style Questions Paper 3
Question
(a) (i) Complete the dot-and-cross diagram in Fig. 8.1 to show the bonding in a molecule of methane, CH4.
Show only the outer-shell electrons.
(ii) State the name of the type of chemical bonding present in a molecule of methane.
Explain your answer.
type of chemical bonding ……………………………………………..
explanation …………………………………………………………………….
(b) Complete the word equation for the complete combustion of methane.
methane + ……………………………………→ …………………………………… + …………………………………..
(c) (i) State the name of the pollutant gas produced during the incomplete combustion of methane.
(ii) State one adverse effect of the gas you have named in (c)(i) on the health of humans.
▶️Answer/Explanation
Ans : 8(a)(i) 1 shared pair of electrons ;
all else correct ;
8(a)(ii) covalent ;
bonding between 2 non-metals / shared electron pairs ;
8(b) oxygen ;
carbon dioxide and water ;
8(c)(i) carbon monoxide ;
8(c)(ii) poisonous ;