Three different compounds are each made of small molecules. The table describes the size of the molecules in each compound.
| Compound | Size of molecules |
|---|---|
| A | Small |
| B | Medium |
| C | Large |
Which compound is predicted to have the lowest boiling point, and why?
Compound C, because the covalent bonds inside larger molecules are weaker
Compound A, because the covalent bonds inside its molecules are easiest to break
Compound C, because larger molecules need less energy to separate
Compound A, because less energy is needed to overcome the forces between its molecules
84 exam-style questions on AQA GCSE Chemistry 2.2 How bonding and structure are related to the properties of substances, covering 2.2.1a The three states of matter, 2.2.1b Limitations of the simple particle model, 2.2.2 State symbols in chemical equations, 2.2.3 Properties of ionic compounds, 2.2.4 Properties of small molecules, 2.2.5 Polymers, 2.2.6 Giant covalent structures, 2.2.7 Properties of metals and alloys, and 2.2.8 Metals as conductors. Each one has a worked solution and a mark scheme showing where the marks go.