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the movement of particles from an area of higher concentration to an area of lower concentration. The particles move down the concentration gradient.
reactions in which oxidation and reduction take place (redox reaction).
to make neutral. An acid-base reaction which produces a salt and water.
mass per unit volume of a substance. The number of molecules in a particular area or a measure...
the electrons in the outermost occupied shell of an atom.
reactions that cause the surroundings to cool. Heat is taken in.