2.1 Define the term element. (2)
2.2 Use the diagram and key provided to answer the following questions.
2.3 Write down the letter of the diagram that represents:
2.3.1 A substance that is solid at room temperature (1)
2.3.2 A mixture that is non-uniform (1)
2.3.3 A pure substance consisting of two or more different elements (1)
2.3.4 A gas (1)
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