1a
6 marks
This question is about the forces between molecules and ions.
Some data for three small molecules are shown.
Molecule | Mr | Boiling temperature / °C |
Fluorine | 38.0 | −188 |
Hydrogen chloride | 36.5 | −85 |
Methanol | 32.0 | 65 |
Explain the large variation in boiling temperatures, given the small range in Mr values.
Detailed descriptions of the forces involved are not required.
1b
2 marks
Calcium chloride is soluble in water.
1c
2 marks
Explain why bromine is a liquid but iodine is a solid at room temperature.
Detailed explanations of the forces involved are not required.
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