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| the building blocks of matter |
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| positively charged molecules |
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| particles that have no charge |
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| negatively charged particles that are located outside the nucleus |
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| a pure substance that cannot be broken down into other substances by physical or chemical means |
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| Atoms of the same element that have different numbers of neutrons |
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| a pure substance formed when two or more different elements combine |
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| a compound in which the atoms are held together by covalent bonds |
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| An atom that has lost or gained one or more electrons and carries an electric charge |
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| an electrical attraction between two oppositely charged atoms or groups of atoms called ions |
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| when molecules come close together, the attractive forces between these positive and negative regions pull on the molecules and hold them together. |
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| the process by which atoms or groups of atoms in substances are reorganized into different substances |
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| the starting substances, on the left side of the arrow |
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| the substances formed during the reaction (on the right side of the arrow |
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| The minimum amount of energy needed for reactants to form products in a chemical reaction |
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| a substance that lowers the activation energy needd to start a chemical reaction |
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| the biological catalysts thatr speed up the rate of chemical reactions |
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| The reactants that bind to the enzyme |
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| The specific location where a substrate binds on an enzyme |
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Molecules that have an unequal distribution of charges - They have oppositely charged regions |
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| a weak interaction involving a hydrogen atom and a fluorine, oxygen, or nitrogen atom |
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| a combination of 2 or more substances which each substance retains its individual characteristics and properties |
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