Chemical reactions are happening everywhere all the time
This topic looks at the difference between chemical and physical changes
Success criteria - can you…
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Compare chemical reactions to physical changes |
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Write word equations for reactions between carbonates and acids |
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Describe the test for carbon dioxide |
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Write word equations for reactions between metals and acids |
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Describe the test for hydrogen |
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Write word equations for reactions between metals and oxygen |
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Describe the test for oxygen |
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State the parts of the fire triangle |
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Know the products of combustion |
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Skill: Carry out the tests for oxygen, hydrogen and carbon dioxide |
Key words
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Word |
Meaning |
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Chemical reaction |
A change in which create new substances are made - difficult to reverse |
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Physical change |
A change in which no new substances are made – easy to reverse |
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Precipitate |
Insoluble solid – looks cloudy |
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Reactant |
A starting substance in a chemical reaction |
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Product |
A substance that is made in a chemical reaction |
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Word equation |
A way of representing a chemical reaction Reactants are on the lefts of an arrow Products are on the right |
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Fossil fuel |
A fuel made from the remains of animals and plants that died millions of years ago - coal, oil and natural gas |
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Fuel |
A material that burns to transfer useful energy |
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Burning |
Combustion or oxidation |
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Combustion |
A chemical reaction in which a substance reacts quickly with oxygen and gives out light and heat |
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Oxidation |
A chemical reaction in which a substance gains oxygen to form an oxide |
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Rusting |
A chemical reaction in which iron metal gains oxygen to form hydrated iron oxide – commonly called rust |