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| The substance particles that make up atoms are protons, neutrons, and electrons |
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| Because they have the same # of electrons, all isotopes of an element have the same have the same chemical properties |
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| The main types of chemical bonds are ionic bonds and covalent bond |
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| A water molecule is polar because there is an uneven distribution of electrons between the oxygen and hydrogen atoms |
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| Acidic solutions contain higher consontrations of H+ ions than pure water and have pH values below 7 |
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| Basic, or alkaline, solutions contain lower consontrations of H+ ions than pure water and have pH values above 7 |
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| Lipids can be used to store energy. some lipids are important parts of biological membranes and waterproof coverings |
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| Nucleic acids store and transmit hereditary, or genetic, infomation |
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| Some protons control the rate of reactions and regulate cell processes. Some are used to form bones and muscles. Others transport substances into or out of cells or help to fight disease |
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