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A4.1 THE IDEA OF A SUBSTANCE
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Water, wax, lead and salt are examples of substances.

A substance has an exact melting point – a particular temperature where it changes from solid to liquid.
Solid and liquid are two possible states a substance can be in.

• If a sample of a substance is above its melting point it will be in the liquid state.





• If a sample of a substance is below its melting point it will be in the solid state.

Notes: see Teachers’ Guide


 
teachers’ guide a5



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a1: melting
a2: freezing
a3: lead and salt
a4: substances

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