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| the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes |
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| anything that has mass and takes up space |
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| a substance that cannot be seperated or broken down into simpler substances by chemical means |
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| the smallest unit of an element that maintains the properties of that element |
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| a substance made of atoms of two or more different elements that are chemically combined |
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| the smallest unit of a substance that keeps all of the physical and chemical properties of that substance |
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| a combination of chemical symbols and numbers to represent a substance |
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| the little numbers written to the right and downwards of the element for whom it says how many atoms of that substance there are per molecule |
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| a sample of matter, either a single element or a single compound, that has definite chemical and physical properties |
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| a combination of two or more substances that are not chemically combined |
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| mixture in which the components are not mixed uniformly and are not evenly distributed |
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