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16 Cards in this Set
- Front
- Back
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chemistry
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the scientific study of the composition, structure, and properties of matter, & the changes that matter undergoes
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matter
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anything that has mass and takes up space
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element
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a substance that can't be separated or broken down into simpler substances by chemical means
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atom
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smallest unit of an element that maintains the properties of that element
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symbols for elements
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are always a single capital letter or a capital letter followed by a lowercase letter
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compound
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a substance made of 2 or more different elements that are chemically combined
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ratio
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when elements combine to make a specific compound, the elements always combine in the same proportions--called ______
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molecule
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the smallest unit of a substance that keeps all of the physical & chemical properties of that substance
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chemical formula
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a combination of chemical symbols & numbers to represent a substance (or compound)
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subscript
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in a chemical formula, the number of atoms of each element is written after the element's symbol & called a _______
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pure substance
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a sample of matter, either a single element or a single compound, that has definite chemical & physical properties
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mixture
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a combination of 2 or more substances that aren't chemically combined to each other
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heterogeneous mixture
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when substances aren't mixed uniformly (unevenly mixed) & aren't evenly distributed
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homogeneous mixture
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where substances are evenly distributed
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miscible liquids
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describe 2 or more liquids that can dissolve into each other in various proportions (evenly distributed, won't settle out)
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immiscible liquids
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describe 2 or more liquids that don't mix with each other (will settle out)
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