Recognise Changes of State: Melting and Boiling

In this worksheet, students will study the changes that occur with melting and boiling.

Key stage: KS 3

Year: Year 7 Science worksheets

Curriculum topic: Chemistry: The Particulate Nature of Matter

Curriculum subtopic: Changes of State: Particle Model

Difficulty level:

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Worksheet Overview

Solids, liquids and gases change state when they are heated.

Melting and boiling are words that we use to describe changes of state - and they happen when a substance is heated.

A solid will turn into a liquid when heated. This process is called melting.

A liquid will turn into a gas when heated. This process is called boiling.

Some liquids will also evaporate slowly over time, if heated gently. Like a puddle in the sun. The liquid water will slowly evaporate into a gas.

changing state diagram

So what do you think is happening to the particles during these changes of state?

Well, when heated, particles in a substance gain energy. This means that they can move around more and when they gain enough energy, they can move further apart and eventually change state.

Got it? Let's try some questions on heating and the resulting changes of state.

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