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10 Cards in this Set
- Front
- Back
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elements that make up 96% of living matter |
carbon, oxygen, hydrogen, and nitrogen |
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covalent bond |
the sharing of a pair of electrons b/w two atoms - strongest type of bond - nonmetal + nonmetal |
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compound vs. molecule |
compound - 2 or more atoms held together by covalent bond molecule - substance containing 2 different elements |
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ionic bond |
when one atom donates an electron to another atom - metal + nonmetal - forms anion & cation - ionic compounds (salts) |
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hydrogen bond |
a hydrogen atom covalently bonded to an atom and w/ a partial positive charge will weakly bond with another electronegative atom |
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van der Waals attractions |
the occurrence of ever-changing regions of positive and negative charge in molecules that allow them to stick together when they are near each other - weak alone, strong if there are many |
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photosynthesis chemical equation |
6CO2 + 6H2O = C6H12O6 + 6O2 redox reaction |
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thermal energy |
kinetic energy associated with the random movement of atoms or molecules |
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pH scale |
0-7 = acidic (more H+ than OH-) 7-14 = basic (more OH- than H+) each step up is x10! pH 3 = 1000x more acidic than pH 6 |
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4 main macromolecules (large & important molecules necessary for life) |
- lipids - proteins - carbohydrates - nucleic acids |
