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Honors Bio Ch2

The Chemistry of Life

TermDefinition
Buffer Solution that prevents sharp, sudden changes in pH
Acid Substance with pH below 7 that releases hydrogen ions (H+) in solution
Base Substance with pH above 7 that produces hydroxide ions (OH-) or accepts hydrogen ions (H+) in solution
pH scale Measurement standard with values from 0-14 used to measure hydrogen ion (H+) concentration
Atom Basic unit of matter
Electron Negatively charged particle that moves around the nucleus of an atom
Nucleus Center of an atom
Molecule Group of 2 or more atoms held together by chemical bonds
Ion Atom or group of atoms that carries a positive or negative charge
Element Pure substance that consists of one type of atom
Isotopes Atoms of the same element that differ in their number of neutrons
Covalent bond Strong chemical bond between atoms in which the electrons are shared
Ionic bond Bond involving the transfer of electrons
Hydrogen bond Weak attraction between a hydrogen atom with a partial positive charge and an electronegative atom in another molecule
Solvent Liquid in which a solute dissolves
Solute Substance that is dissolved
Solution Liquid mixture in which all of the components are dissolved
Cohesion Attraction between molecules of the same substance, such as two water molecules
Adhesion Attraction between molecules of two different substances
Compound Substance formed by the chemical combination of two or more different types of atoms in definite proportions
Created by: KES-HFHS
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