Every action produces an equal and opposite -- when one object exterts a force on another object,the second object pushes back with the same amount of someone knows the answer​

The answer will be Reaction, second will be force

Yet both compounds and elements are considered pure substances. Pure compounds are created when elements combine permanently, forming one substance. For example, when the elements mercury and oxygen combine, and a chemical reaction takes place, mercury (II) oxide is created.

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