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| The center of the atom which contains the protons in neutrons. |
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| Negatively charged particle; located outside the atomic nucleus. |
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| Atom of an element that has a number of neutrons different from that of other atoms of the same elements. |
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| Substance formed by the chemical combination of two or more elements in definite proportians. |
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| Bond(s) formed when one or more electrons are transferred from one atom to another. |
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| Atom that has a positive or negative charge. |
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| Bond formed by the sharing of electrons between atoms. |
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| Smallest unit of most compounds. |
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| Compound made up of carbon hydrogen and oxygen atoms; major source of energy for the human body. |
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| Attraction between molecules of the same substance. |
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| Attraction between molecules of different substances; in plants, attraction between unlike molecules. |
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| Material composed of two or more elements or compounds that are phisically mixed together but not chemically combined. |
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| Mixture of two or more substances in which the molecules of the substances are evenly distributed. |
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| Substance that is disolved in a solvent to make a solution. |
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| Substance in which a solute is dissolved to form a solution. |
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| Mixture or water and nondissolved materials. |
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| Measurement system used to indicate the concentration of hydrogen ions (H+) in solution: ranges from 0 to 14. |
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| Compound that forms hydrogen ions (H+) in solution. |
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| Compound that produces hydroxide ions (OH+) in solution. |
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| Weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH. |
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| Small unit of most compounds. |
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| Large compound formed from combinations of many monomers. |
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| Large macromolecule formed from monosacharides. |
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| Macromolecule made mainly from carbon and hydrogen atoms; includes fats, oils, and waxes. |
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| Macromolecule containing hydrogen, oxygen, nitrogen, carbon, and phosphorus. |
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| Single-stranded nucleic acid tthat contains the sugar ribose. |
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| Nucleic acid that contains the sugar deoxribose. |
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| Macromolecule that contains carbon hydrogen, oxygen, and nitrogen: needed by the body for growth and repair and to make up enzymes. |
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| Compound with an amino group (-NH2) on one end and a carboxyl group (-COOH) on the other end. |
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| Process that changes one set of chemicals into another set of chemicals. |
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| Element or compound that enters into a chemical reaction. |
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| Element or compound produced by a chemical reaction. |
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| Energy needed to get a reaction started. |
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| Substance that speeds up the rate of a chemical reaction. |
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| Protein that acts as a biological catalyst. |
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| Reactant of an enzyme-catalyzed. |
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