Edexcel IGCSE Chemistry 1.47 Simple molecular structures
Practise explaining why simple molecular substances have low melting or boiling points using weak intermolecular forces and energy changes.
- Syllabus
- First assessment 2019
- Course
- Chemistry 4CH1
Exam points
- explain low boiling points by linking weak intermolecular forces to little energy needed
- apply the same force-and-energy argument to substances
- state a physical state at room temperature from simple molecular melting or boiling point data
1.47 Simple molecular structures question 1
[Maximum number: 2]
Carbon dioxide is a simple molecular covalent substance.
Explain why carbon dioxide turns from a solid to a gas at a very low temperature.
An explanation that links the following two points:
- weak forces of attraction between molecules / weak intermolecular forces of attraction
- little energy is needed to overcome the intermolecular forces
Allow:
- weak intermolecular bonds
- weak intermolecular attractions
- little energy needed to separate the molecules
Ignore:
- less energy
Marking guidance:
- The second mark depends on the first mark being correct or missing.
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