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28 Cards in this Set
- Front
- Back
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atom
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smallest piece of matter that cannot be commonly broken down
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atomic number
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number of positive charges or protons in the nucleus of an atom.
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chemical change
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any change from one state which is accompanied by alteration of chemical composition
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compound
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pure substance made of more than one element
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density
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compactness
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electron
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small particles located outside the nucleus and have a negative charge
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electron cloud
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region where electrons would probably be found swirling around the nucleus
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energy level
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rings in which the electrons travel. The further away from the nucleus, the more energy
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gas
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any fluid or mixture of fluids
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ion
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charged atoms
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isotope
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one of two or more atoms with the same atomic number that contains different number of neutrons.
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liquid
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molecules that move freely amongst themselves but do not separate
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mass
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a large coherent body o f matter without a definite shape
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mass number
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integer nearly in value to the atomic weight of an atom and equal to the number of nucleons in the nucleus of the atom
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matter
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the substance of which any physical object consists or is composed of.
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mixture
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a combination or blend of different elements
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neutron
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a particle with no charge
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nucleus
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positively charged center of atom
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physical change
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substance change from one state to another
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physical property
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property used to characterize matter and energy
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plasma
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hot ionized material consisting of nuclei and electrons
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proton
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positive charged elementary particles
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solid
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having three dimensions
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specific gravity
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density of liquids compared to other liquids
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volume
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mass of gravity
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pure substance
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matter made of one kinds of material with definite properties
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chemical symbols
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one or two letters used to represent an element
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chemical formula
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symbols for chemical substances
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