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| a system of knowledge based on facts or principles |
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| the application of science to meet human needs |
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| a tested, possible explanation of a natural event |
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| a summary of an observed natural event |
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| a series of logical steps to follow in order to solve problems |
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| applying logic and reason to observations and conclusions |
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| anyhting that can change in an experiment |
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| the straight-line distance between any 2 points |
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| measure of the quantity of matter in an object |
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| a measure of space, such as the compacity of a container |
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| the force with which gravity pulls on a quantity of matter |
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| a value written as a simple # multiplied by the power of 10 |
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| degree of exactness in a measurement |
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| the digits in a measurement that are known with certainty |
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| the extent to which a measurement approaches the true value |
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| the study of matter and how it changes |
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| anything that hs mass and occupies space |
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| a substance that cannot be broken down into a simpler substance |
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| the smallest particlethat has the properties of an element |
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| a substance made of atoms of more than one element bound together |
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| the smallest unit of a substance that exhibits all of the properties charcteristic of that substance |
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| the chemical symbols and numbers indicating the atoms contained in the basic unit of a substance |
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| any matter that has a fixed composition and definite properties |
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| a combination of more than one pure substances |
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| describes 2 or more liquids that are able to dissolve into each other in various proportions |
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| describes 2 or more liquids that do not mix into each other |
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| mixture the same throughout |
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| mixture where the substances aren't uniformly formed |
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| the dissolved substance in a solution |
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| the dissolving medium in a solution |
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| a homogeneous mixture of 2 or more substances uniformly spread throughout a single phase |
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| a mixture of very tiny particles of pure substances that are dispersed in another substance but do not settle out of the substance |
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| a mixture that looks uniform when stirred or shaken that seperates into different layers when it is no longer agitated |
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| definate shape, definate volume |
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| no definate shape, definate voliume |
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| no definate shape or volume |
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| the force exerted per unit area of a surface |
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| the ability to change or move matter |
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| the resistance of a fluid to flow |
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| the change of a substance from a liquid to gas |
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| the change of a substance from a gas to a liquid |
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| the change of a substance from a solid to a gas |
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| the way a substance reacts with others to form new substances with different properties |
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| the ability of a substance to combine chamically with another substance |
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| a characteristic of a substance that can be observed or measured without changing the composition of the substance |
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| the temp at which a solid becomes a liquid |
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| the temp at which a liguid becomes a gas |
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| the mass per unit volume of a substance |
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| the force with which a more dense fluid pushes a less dense substance upward |
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| a change that occurs when a substance changes composition by forming one or more new substances |
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| a change in the physical form or properties of a substance that occurs without a change in composition |
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| the center of an atom; made up of protons and neutrons |
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| a positively charged subatomic particle in the nucleus of an atom |
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| a neutral subatomic particle in the nucleus of an atom |
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| a tiny negatively charged subatomic particle moving around outside the nucleus of an atom |
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| any of the possible energies an electron may have in an atom |
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| a region in the atom where there is a high probability of finding electrons |
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| an electron in the outermost energy level of an atom |
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| properties of elements tend to change in a regular pattern when elements are arranged in order of increasing atomic number, or number of protons in their atoms |
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| a horizontal row of elements in the periodic table |
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| a vertical column of elements in the periodic table |
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| the process of adding electrons to or removing electrons from an atom or group of atoms |
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| an atom or group of atoms that has lost or gained one or more electrons and therefore has a net electric charge |
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| an ion with a postitive charge |
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| an ion with a negative charge |
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| the # of protons in the nucleus of an atom |
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| the total # of protons and neutrons in the nucleus of an atom |
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| any atoms having the same # of protons but different #s of neutrons |
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| a quantity = to 1/12 of the mass of a carbon-12 atom |
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| the weighted average of the masses of all naturally occuring isotopes of an element |
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| the elements that are good conductors of heat and electricity |
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| the elements that are usually poor conductors of heat and electricity |
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| the elements that are intermediate conductors of heat and electricity |
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| the highly reactive metallic elements located in group 1A of the periodic table |
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| the reactive metallic elements located in group 2A |
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| the metallic elements located in all the B's of the periodic table |
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| the highly reactive elements located in group 7A |
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| the unreactive gaseous elements located in group 8A |
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| came up with the idea that atoms exist during B.C. and couldn't prove |
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| atomic theory that *elements are made of tiny unique particles called atoms *atoms of the same element are exactly alike *atoms of different elements can join to form molecules |
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| exactly like the modern model except he said electrons orbit specific paths, but they don't |
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