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26 Cards in this Set
- Front
- Back
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substance
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a single kind of matter that is pure
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elements
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a pure substance that cant be broken into any substance by chemical or physical means
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atom
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the smallest piece of any element of the building blocks of life
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chemical bond
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a force of attraction between 2 atoms
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molecule
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a group of 2 or more atoms held together by chemical bonds
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compound
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a pure substance made of 2 or more elements in a certain ratio
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mixture
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made of 2 or more substances that are together in the same place but are not chemical combined
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fluid
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substances that flow
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surface tension
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when molecules attract each other strong enough that the outer layer acts like a skin
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viscosity
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resistance of a liquid to flow
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melting
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changing from a solid to a liquid
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melting point
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the point at which something starts to melt
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freezing
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changing from a liquid to a solid
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vaporization
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changing from a liquid to a gas
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condensation
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change from a gas to a liquid
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sublimation
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when the surface particles in a solid get enough energy to form a gas without becoming a solid first
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subatomic particles
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pieces smaller then atoms
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nucleus
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middle of the cell or anything
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AMU
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atomic mass units
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atomic member
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every atom of an element has the same # of protons
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isotope
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atoms with the same # of protons and different # of neutrons
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mass #
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amount of mass of an atom in AMU
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periodic table
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property of the elements
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period
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horizontal rows in table(7)
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group or family
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the 18 vertical columns in the periodic tables
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average atomic mass
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average of all different isotopes of an element
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