I use a number line method to teach melting and boiling points - plot them on a number line and see where 20oC is. Here is a worksheet I use for teaching KS3 and revision for KS4.
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Found a few issues with this but it was easy to correct
Simple but very effective resource to help students work out states of different elements at room temperature.
Easy to follow and understand. Great starter activity for KS4<br />
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