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Definition
| loss of an electron. may happen during some chemical reaction |
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| gain of an electron. may happen during some chemical reaction |
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Definition
| refers to a group of atoms held together by energy in a stable association |
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| composed of two or more different types of atoms bond together |
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Definition
| are formed because ions of opposite charge attract one another |
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Definition
| are formed when two or more atoms share pairs of valence electrons |
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Definition
attractive force between the hydrogen attatched to an electronegative atom of one molecule and an electronegative atom of a different molecule.
---easiest to make, easiest to break |
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| a change in mass or distance |
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| chemical reactions in cells cannot start without help. gets the reaction started |
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Definition
| produce more energy than they use |
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| use more energy than they produce |
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Definition
| molecules based on carbon and hydrogen |
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Definition
| molecules not based on carbon and hydrogen |
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| essential molecules obtained from food |
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Definition
| all body cells except sex cells |
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Term
phospholipid bilayer
*hydrophillic heads-toward watery environment, both sides
*hydrophobic fatty-acid tails-inside membrane barrier to ions and water soluble compounds |
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Definition
double layer of phospholipid molecules
*2 characteristics |
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