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Elements and Compounds
And distinguishing between atoms and molecules
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ELEMENTS Pure substances Cannot be decomposed
The building blocks of all matter There are 113 known elements
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Examples
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COMPOUNDS Pure Substance Made from combining elements
Not all combinations of elements are compounds, some are mixtures Can be decomposed into simpler substances Have a definite composition a fixed number of elements
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Examples
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ATOMS The smallest possible unit of an element
An element only contains one type of atom
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MOLECULES Particles made of two or more atoms
The smallest particle of a substance that retains the properties of the substance
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Heterogeneous Mixture
Self Check Homogeneous Mixture Compound Heterogeneous Mixture Homogeneous Mixture Compound
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Classifying Matter No Uniform Properties?? Yes Fixed Composition? Yes
Compound Heterogeneous No Uniform Properties?? Yes Fixed Composition? Yes No Yes More than one element?? No Homogeneous Element
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