Term
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Definition
| makes up living organisms |
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Term
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Definition
| a substance that cannon be broken down to other substances by ordinary chemical means |
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Definition
| essential but only in minute quantities |
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Term
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Definition
| Oxygen, Carbon, Hydrogen, Nitrogen |
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Term
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Definition
| a substance containing two or more elements in a fixed ratio |
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Term
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Definition
proton +
neutron =
electron - |
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Term
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Definition
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Term
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Definition
| the sum of the protons and neutrons in an atom's nucleus |
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Term
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Definition
| same umber of protons/electrons and behave identically in chemical reactions, the only difference is the number of neutrons |
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Term
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Definition
| the attractions that keep atoms close together |
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Term
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Definition
| an atom or molecule with an electrical charge resulting from a gain or loss of one or more electrons |
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Term
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Definition
| a synonym for an ionic compound |
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Term
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Definition
| two atoms share one or more pairs of outer-shell electrons |
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Term
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Definition
| two or more atoms held togehter by a covalent bond form a molecule |
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Term
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Definition
| indicated by a pair of lines between the oxygen atoms |
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Term
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Definition
| an atom's attraction for its electrons, including shared electrons |
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Term
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Definition
produced by an unequal sharing of elecrtons
(partially + and partially -) |
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Term
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Definition
| has an unequal distribution of charges |
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Term
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Definition
| when an H atom is part of a polar covalent bond |
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Term
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Definition
| the tendancy of molecules to stick together |
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Term
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Definition
| (related to cohesion) and it is a measure of how difficult it is to stretch or beak the surface of a liquid |
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Term
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Definition
| the amout of energy associated with the movement of atoms and molecules in a body of matter |
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Term
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Definition
| measures the intensity of heat (the average speed of molecules rather than the total amount of heat energy in a body of matter) |
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Term
| ice is less dense than liquid water. why? |
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Definition
| because the ice crystal has fewer molecules than an equal volume of liquid water |
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Term
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Definition
| a liquid consisting of a uniform mixture of two or more substances |
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Term
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Definition
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Term
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Definition
| a substant that the solvent is dissolved in |
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Term
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Definition
| the result of water being the solvent |
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Term
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Definition
| a compoud that accepts hydrogen ions and removes them from solutoin (base >7) |
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Term
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Definition
| a compound that donates hydrogen ions to a solution (acid <6) |
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Term
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Definition
| rain, snow, or fog with a pH lower than 5.6 |
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Term
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Definition
| a process leading to changes in the composition of matter |
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