This topic looks at what atoms and elements are
How elements bond to form compounds
Compares compounds to mixtures
Looks at the arrangement of the periodic table
Success criteria - can you…
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Define atoms, elements and compounds |
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Understand the layout and varying physical and chemical properties of the elements in the periodic table |
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State some common element symbols |
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State the physical properties of metals and non-metals |
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State the chemical properties of metal and non-metal oxides with respect to acidity |
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Identify elements, compounds and mixtures using a simple atomic model |
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Explain the conservation of mass for changes of state and chemical reactions |
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Understand chemical reactions as the rearrangement of atoms |
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Represent chemical reactions using formulae and equations |
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Skill: Balance simple chemical equations |
Key words
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Word |
Meaning |
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Atom |
Smallest particle that can exist on its own |
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Element |
Made up of just one type of atom |
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Mixture |
Two or more substances mixed together, no fixed ratio and easily separated |
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Alloy |
Two or more metals mixed together |
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Compounds |
Different types of atoms bonded together in a fixed ratio |
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Chemical formula |
Combination of symbols and numbers that show how many atoms of different kinds there are in a particular compound |
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Equation |
Shows the reactants and products of a reaction Written as: reactant → product |
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Word equation |
Equation written with words |
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Chemical equation |
Equation written with chemical formula |
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Reactant |
Substance which is present at the start of a reaction |
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Product |
Substance which is present at the end of a reaction |
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Conservation of mass |
In a chemical reaction the total mass of reactants is equal to the total mass of products |