The term 'pure substance' has a different meaning in chemistry compared to its use in everyday life.
Which is the definition of a 'pure substance' in chemistry?
Tick (✓) one box.
A useful product made by mixing substances | |
A substance that has had nothing added to it | |
A single element or compound | |
A substance made from only one type of atom |
The meaning of a pure substance in everyday life is different to in chemistry.
Complete the sentence.
In everyday language, a pure substance means a substance that has had ____________________ added to it.
Which are examples of pure substances in chemistry terms?
Tick (✓) two boxes.
Pure water | |
Pure orange juice | |
Pure air | |
Pure carbon dioxide | |
Pure milk |
Melting points and boiling points can be used to determine if a substance is chemically pure.
Complete the sentences.
Choose the answers from the box.
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A pure substance has a ____________________ melting point or boiling point.
An impure substance has a wider range of melting point or boiling point, which is ____________________ the pure sample.
The melting point of a sample of impure water was found experimentally.
Draw one line from the sample to the most likely melting point of the impure water.
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