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16 Cards in this Set
- Front
- Back
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What is Chemistry
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The study of the composition, structure, and properties of matter and of changes that occur in matter.
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Matter
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anything that has mass and occupies space. Has measurable properties. The stuff things are made of.
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Matter can be subdivided into two broad categories called:
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Substances and Mixtures
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Compounds
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Two or more elements in fixed proportions, that can be broken down into their constitutent atoms/elements
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Homogenous
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Also called solutions. The composition and properties are uniform throughout a solution.
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Heterogenous
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Composition and/or properties vary from one part of the mixture to another.
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Atoms
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the smallest distinctive units ina sample of matter.
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Molecules
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larger units in which two or more atoms are joined together.
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Physical Property
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Displayed by a sample of matter whithout undergoing any change in the composition of the matter. Include mass, color, volme, temperature, density, melting point, etc.
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Chemical Property
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displayed by a sample of matter as itundergoes a change in composition. Flammability, toxicity, reactivity, acidity
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Solution
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has the same composition througout, though the composition of different homogeneous mixtures may vary. Soda pop, salt water, 14K Gold, and plastics
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Mixture
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Varies in composition and/or properties from one part of the mixture to another. Adhesive tape, CD, pen, battery, chair, and people
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Scientific Knowledge is...
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testable, reproducible, explanatory, predictive, and tentative.
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Hypothesis
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A tentative explanation of the facts and observations.
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Scientific law
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a mathematical description of "here's what will happen."
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Theory
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The explanation for a law.
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