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| The center of an atom, which contains the protons and neutrons |
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| A pure substane that consists 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 transferred 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 compound that displays all the properties of that compound |
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| The attraction between molecules of the same substance |
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| The force of attraction between kdifferent 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 hydroxide ions in solution; a solution with a pH of less than 7. |
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| A compound that releases hydroxide ions in solution; a solution with a pH of more than 7. |
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| A compound that prevents sharp, sudden changes in pH. |
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| A compound made up of carbon, hydrogen, and oxyen atoms; a type of nutrient that is the main source of energy for the body |
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| A macromolecule made mostly from carbon and hydrogen atoms; includes fats, oils, and waxes |
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| A macromolecule 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 with an amino group on one end and a 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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