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27 Cards in this Set
- Front
- Back
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systematic approach to research.
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Scientific method
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general observations about a system.
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Qualitative data
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numbers obtained from measurements.
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Quantitative data
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tentative explanation of observations.
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Hypothesis
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concise verbal or mathematical statement of relationship that is always the same under the same conditions.
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Law
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unifying principle that explains body of facts.
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Theory
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anything that occupies space and has mass.
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Matter
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study of matter and changes it undergoes.
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Chemistry
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matter that has definite or constant and distinct properties.
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Substance
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combination of two or more substances in which the substances retain their own properties.
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Mixture
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composition the same throughout
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Homogeneous
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composition is not uniform.
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Heterogeneous
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substance that cannot be separated into simpler substances.
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Element
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substance composed of two or more elements chemically united in fixed proportions.
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Compound
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can be measured and observed w/o changing the composition or identity of substance.
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Physical property
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any property of a substance that cannot be studied w/o converting the substance into some other substance.
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Chemical property
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depends on how much matter is being considered.
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Extensive property
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does not matter how much matter is being considered.
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Intensive property
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can be determined directly.
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Macroscopic properties
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must be determined by an indirect method (on atomic or molecular scale).
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Microscopic properties
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measure of quantity of matter in an object.
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Mass
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force that gravity exerts on an object.
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Weight
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length cubed (meter)
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Volume
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volume occupied by on cubic decimeter
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Liter
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the meaningful digits in a measured or calculated quantity.
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Significant figure
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how close measurement is to the true value of quantity that was measured.
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Accuracy
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how closely two or more measurements of the same quantity agree w/one another.
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Precision
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