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Wk 3 Vocab

OBHS Biology

Element substance consisting entirely of one type of atom (Ex: oxygen)
Isotope atom of an element that has a number of neutrons different from that of other atoms of the same element (Ex: Carbon 14)
ionic bond bond formed when one or more electrons are transferred from one atom to another (Ex: NaCl)
covalent bond bond formed by the sharing of electrons between atoms. (Ex: H20)
Molecule smallest unit of most compounds
Buffer weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
activation energy energy needed to get a reaction started
enzyme protein that acts as a biological catalyst
cohesion attraction between molecules of the same substance
adhesion attraction between molecules of different substances; in plants, attraction between unlike molecules
ion atom that has a positive or negative charge
pH scale measurement system used to indicate the concentration of hydrogen ions (H+) in solution; ranges from 0 to 14
Created by: ARhymer