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13 Cards in this Set
- Front
- Back
Scientific method
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a logical, systematic approach to the solution of a scientific problem; steps in the scientific method include making observations, testing hypotheses, and developing theories.
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Theory
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a well-tested explanation for a broad set of observations
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Observation
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information obtained through the senses; observation in science often involves a measurement.
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Hypothesis
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a proposed explanation for an observation
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Element
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the simplest form of matter that has a unique set of properties; an element cannot be broken down into simpler substances by chemical means.
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Compound
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A substance that contains two or more elements chemically combined in a fixed proportion
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Mixture
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a physical blend of two substances that are not chemically combined
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Heterogeneous mixture
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a mixture that is not uniform in composition; components are not evenly distributed throughout the mixture
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Homogeneous mixture
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a mixture that is uniform in composition; components are evenly distributed and not easily distinguishable
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Chemical change (and an example)
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a change that produces matter with a different composition that the original matter. Clues that a chemical change has taken place include a transfer of energy, color change, formation of a precipitate, or the production of a gas
Ex: rusting, burning, rotting, exploding, etc. |
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Chemical property
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the ability of a substance to undergo a specific chemical change
Ex: ability to rust |
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Physical Change (and an example)
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a change during which some properties of a material change, but the composition of the material does not change.
Ex: an ice cube melting |
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Physical property (and an example)
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a quality or condition of a substance that can be observed or measured without changing the substance's composition
Ex: hardness, color, conductivity, malleability |