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21 Cards in this Set
- Front
- Back
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chemisty
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the study of the composition of matter the changes matter undergoes
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scientific method
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logical systematic approach to the solution of a scientific problem
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theory
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well tested explanation for a broad set of explanations
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law
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concise statement that summarizees the results of many observations and experiments
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compounds
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2 or more elements chemically united in fixed proportions
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substances
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constant composition/pure
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elements
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cant be broken down or seperated
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mixtures
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variable composition, can be physically seperated
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Law of Conservation of Mass
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Matter can't be created or destroyed, only transformed
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examples of a physical change
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phase changes, dissolving vs. cutting/breaking/crushing
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examples of a chemical change
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burn, react, explode, combust
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physical change
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any change in form or appearance that does nto affect the identity of a substance
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chemical change
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any change that changes the composition of a substance
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intensive properties
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depend on the type of matter
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extensive properties
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depend on the amount of matter
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accurate
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a measure of how close something is to the true value "correctness"
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precision
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how close a series of measurements are to one another. "reproducibility"
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addition/subtraction
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the reported answer cannot have more digits to the right of the decimal point than either of the original numbers
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multiplication/division
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the reported answer cannot have moer sig figs than the number with the smallest amount of digits
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what are the base units?
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liter, gram, meter
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what is the order from largest to smallest of the derived units?
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mega --> kilo --> base --> deci --> centi --> milli --> micro
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