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| the center of an atom which contains the proton and neutrons |
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| a negatively charged particle ; located in the space surrounding the nucleus |
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| A pure substance that consits entirely of one type of atom. |
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| one of several forms of a single element, each of which contains the same number of protons but different numbers of neutrons |
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| A substance formed by the chemical combination of two or more elements in definite proportions |
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| A chemical bond formed when one or more electrons are trasfered from one atom to another |
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| a type of bond between atoms in which the electrons are shared. |
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| the smallest unit of most compounds that displays properties of that compound |
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| the attraction between different kinds of molecules |
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| a type of mixture in which all the components are evenly distributed |
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| a mixture of water and nondissolved material |
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| a compound that releases hydrogen ions (H+) in solution; a solution with a pH of less than 7 |
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| a compound that pervetns sharp, sudden changes in pH. |
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| a compound made up of carbon, hydrogen, and oxygen |
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| a macromolecule made mostly from carbon and hydrogen atoms; includs fats, oils and waxes. |
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| a macromole containing hydrogen oxygen nitrogen carbon and phosphorus |
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| a macromolecule that contains carbon, hydrogen, oxygen, and nitrogen; needed by the body for growth and repair |
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| a compound whith an amino group on one end and carboxyl group on the other end. |
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| the process that changes, or transforms one set of chemicals into another set of chemicals. |
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| the energy that is needed to get a reaction started. |
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| a substance that speeds up the rate of a chemical reaction |
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| A protein catalyst that speeds up the rate of specific biological reactions. |
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