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Unformatted text preview: 1 Chapter 2: Chemical Composition of the Body I. Atoms: The units of matter that form all chemical substances A. Subatomic particles 1. Protons (+): 2. Neutrons: 3. Electrons (-): B. Atomic number: C. Atomic weight: D. Atomic composition of human body: -Hydrogen -Oxygen -Carbon -Nitrogen II. Molecules: Example: A. Covalent chemical bonds: Number of covalent bonds formed: Hydrogen=1 Oxygen=2 Nitrogen=3 Carbon=4 Examples: III. Ions: A gain or loss of electron(s) A. Cations B. Anions C. Ionic bonds: Ionization: 2 IV. Free Radicals: V. Polar Molecules A. Polar covalent bond (polar bond): Electrons are not equally shared between 2 atoms B. Molecules 1. Polar: 2. Nonpolar: C. Hydrogen bond: Elecrical attaction between H+ in one molecule and O or N in another molecule D. Water: -Hydrolysis -Dehydration V. Solutions A. Definitions 1. Solutes: 2. Solvent: 3. Solution: B. Molecular Solubility 1. Ionic Bond: Strong attraction between 2 oppositely charged ions 2. Hydrophilic: H 2...
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- Spring '08