Paper 2 · Atomic structure, ions and covalent bonding
Methane (CH4) is the covalent compound formed when atom A in Fig. 1 bonds with four hydrogen atoms. Which of the following statements about methane is correct?
AIt is a good conductor of electricity in the solid state.
BIt has a low boiling point because its molecules are held together by weak intermolecular forces.
CIt is highly soluble in water.
DIt exists as a giant ionic lattice at room temperature.
Explanation: Methane is a small covalent molecule; the weak van der Waals forces between molecules give it a low boiling point.
Derived from ZIMSEC Chemistry 5071/2 Paper 2 Theory, November 2013, Q1
