The table gives the boiling point of three substances that all consist of small molecules. Which substance has the largest molecules, and why?
Table: The boiling point of three substances that consist of small molecules
| Substance | Boiling point in ∘C^\circ\text{C}∘C |
|---|---|
| X | -25 |
| Y | 78 |
| Z | 174 |
Substance X, because it has the lowest boiling point
Substance Y, because its boiling point is in the middle
Substance Z, because it has the highest boiling point
Substance Z, because it has the weakest forces between molecules
42 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.