GCSE · Chemistry · AQA · Spec 8462
Properties of small molecules
Why are melting and boiling points low?
Reason it through
Why do substances made from small molecules usually have relatively low melting and boiling points?
First link · your turn
First, where are the weak forces in a molecular substance?
What happens when it melts or boils?
Track which forces are overcome as the substance is heated.
Relationship matrix
Tap any cell to reveal it. Tap a column header to read one property down every item.
Each cell hides a short answer and the reason behind it. Predict before you tap.
What actually breaks?
Commit to an answer before revealing the explanation.
A small-molecule substance boils. Which statement best describes what has been overcome?
Explain the properties from the structure
Problem
A substance consists of small molecules. Explain why it has a relatively low boiling point and does not conduct electricity.
WHAT YOU'VE LEARNED
A quick recap of today's lesson.
Strong bonds inside each molecule, weak forces between molecules — that distinction explains the properties.
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