chemistry vocab test 1
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| matter | anything that has mass and takes up space
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| mass | amount of matter the object contains
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| physical property | quality or condition of a substance that can be observed or measured with out changing the substances composition
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| 7 words describing physical property | color, solubility, odor, hardness, density, melting point, and boiling point
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| states of matter | the physical state of a substance is the physical property of that substance
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| solid | matter that has a definite shape and volume, molecules compact
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| liquid | form of matter that flows, has a fixed volume and takes the shape of its container, molecules slide past each other
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| gas | a form of matter that takes both the shape and volume of its container, space between molecules
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| vapor | the gaseous state of a substance that is generally a liquid or a solid at room temperature
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| physical change | a change that alters a material without changing its composition
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| 12 words for physical change | boil, freeze, dissolve, melt, condense, break, split, crack, grind, cut, crush and bend
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| mixture | PHYSICAL blend of two or more substances
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| substance | matter that has a uniform and definite composition, contain only one type of matter, pure
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| heterogeneous mixture | one that is not uniform in composition
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| homogeneous mixture | one that has a completely uniform composition
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| solution | a homogeneous mixture
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| solute | dissolved particles in a solution, usually the smaller amount between the two parts of the solution is the solute
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| solvent | the dissolving medium
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| phase | any part of a system with uniform composition and properties
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| element | the simplest form of matter that can exist under normal laboratory conditions
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| compound | substances that can be separated into simpler substances only by chemical means
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| chemical reaction | the changing of substances to other substances by the breaking of bonds in reactants and the formation of bonds in products, cooking and baking is chemical
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| reactant | the starting substances in a chemical reaction
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| product | the substances formed in a chemical reactants
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| chemical property | the ability of a substance to undergo a chemical reaction and to form new substances
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| chemical change | results in a change in chemical composition of the substances involved
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| 7 words for chemical change | burn, rot, rust, decompose, ferment, explode, corrode
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| 4 evidences of chemical change | gas produced, color change, precipitate forms, energy change
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| law of conservation of mass | mass can be neither created nor destroyed in an ordinary chemical or physical process
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| exothermic | a heat dissipating process
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| endothermic | a heat absorbing process
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| precision | measure of how close a series of measurements are to one another
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| accuracy | closeness of a measurement to the true value of what is being measured
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