Aiming for Grade 4 LOs:

• State that small molecules have low melting and boiling points.
• State that small molecules do not conduct electricity.
• Describe an intermolecular force.

Aiming for Grade 6 LOs:

• Explain how the size of molecules affects melting and boiling points.
• Explain why small molecules and polymers do not conduct electricity.
• Identify substances that would have weak intermolecular forces.

Aiming for Grade 8 LOs:

• Predict the physical properties of unfamiliar covalently bonded substances.
• Compare and contrast the properties of substances with different bonding.
• Justify the use of a model to explain the physical properties of a small molecule and discuss the limitations of various molecular models.