difference between chemical changes and chemical rxn?
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Chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions.
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When a substance undergoes a chemical change, its molecular composition is changed entirely. ... During a chemical reaction, absorption and evolution of energy take place. Some examples of physical change are freezing of water, melting of wax, boiling of water, etc.
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