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Bonds are broken and formed, changing substance identities.
Observable physical evidence like gas release or color change.
To represent the reactants and products of a reaction.
They must be balanced to conserve mass.
Adjust coefficients without changing subscripts.
Quantities of pure substances in chemical reactions.
Expressed in moles, not grams.
Mass of reactants equals mass of products in a reaction.
Conversion factors for reactants and products.
Subscripts must not be altered.