BIOL 1005 Chapter Notes - Chapter 2: Vaporization, Subatomic Particle, Solution

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Acid a substance that releases hydrogen ions when it dissolves in water. Acidic when the overall concentration of h+ ions exceeds the concentration of oh- ions. Antioxidant any molecule that reacts with free radicals, neutralizing their ability to damage biological molecules. Atom the smallest unit of an element; each atom retains all the chemical properties of that element. Atomic nucleus cluster of protons and neutrons in the center of an atom. Atomic number the number of protons in the nucleus. Base a substance that combines with hydrogen ions, reducing their number. Basic when the overall concentration of oh- ions exceeds the concentration of h+ ions. Buffer a type of molecule that tends to maintain a solution at a constant ph by accepting or releasing h+ in response to small changes in h+ concentration. Chemical bond attractive forces that hold atoms together in molecules. Formed when reactive atoms gain, lose, or share electrons to gain stability and become less reactive.

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