Common observations of a chemical reaction are described in the Introduction section. For each observation, name a common or everyday occurrence that must involve a chemical reaction.
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Common observations of a chemical reaction are described in the Introduction section For each observation name a common or everyday occurrence that must involve class=

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Answer:

12x+4x-7y+45b+78a-44b+1a+1z+0d+1.1a+1.1a