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Letter or letters used to represent each element; 1st letter is always CAPITALIZED and 2nd is always lower cased
symbols and numbers used to show the numbers and types of atoms in a compound or molecule
Used to show a chemical reaction when 2 or more elements or compounds react to form new substances
A change in size, shape or form that does NOT change the properties of the substance
molecules that make up cell membrane; "head" region is attracted to water while "tail" region is not
van der Waals forces
a slight attraction that develops between the oppositely charged regions of nearby molecules
A scale that indicates the acidity of a solution; it is based on the concentration of hydrogen ions.
weak acid or base that can react with strong acids or bases to help prevent sharp, sudden changes in pH
The making and breaking of chemical bonds, resulting in the creation of new substances.
A type of protein that speeds up a chemical reaction in a living thing by reducing the activation energy needed to start the reaction
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