3 Chemical and material behaviour
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3.2 Chemical reactions |
| explain the difference between reversible and irreversible changes
| describe how elements combine to form the building blocks of all substances
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| use experimental evidence to explain that a chemical reaction has taken place
| describe elements as consisting of only one type of atom
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| describe the ways in which materials can vary in their appearance and state using a range of features
| use a simple model or analogy to show similarities and differences between elements, compounds and mixtures
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