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21 Cards in this Set
- Front
- Back
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matter
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anything that occupies and has mass
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atom
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the smallest portion of an element that can enter a chemical reaction
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element
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the most basic substances
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# of naturally occuring elements
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92
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ion
cation anion |
charged atom
+ charge - charge |
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polyatomic ion
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naturally occuring ions that contain two or more atoms
many are important nutrients sources for plants taken up from soil |
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compound
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two or more elements combined together in with ionic or covalent bonds
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molecule
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smallest portion of a compound
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ionic bond
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transfer of elections -- nonmetal and metal
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covalent bond
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sharing of electrons -- nonmetal and nonmetal
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cohesion
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the attraction of like substances to one another
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adhesion
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the attraction of unlike substances to one another
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water comprises :
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over 1/2 of living matter
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water make up over ___ of the weight of plant tissues
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90%
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water is a
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universal solvent
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water is
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polar
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the other two principle elements tat actively engage in hydrogen bonding are
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nitrogen and oxygen
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hydrogen bonding is not a true chemical bond it is
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an electrostatic attraction b/c of charge and electronegativity
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water is a dipolar molecule at bent at an ___ angle
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104.5
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other examples of polar molecules:
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CH3OH, NH4, Ca2, H3PO4, H3O, or any molecules which have OH or NH or charged functional groups.
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examples of nonpolar molecules:
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CO2, CH4, C2H6, or benzene or any other molecule of one or more hydrocarbon chains.
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