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4 August, 18:49

The concentration of a substance involved in a reaction changes from 4.0 M to 2.0 M in 40 minutes. Is the substance a reactant or a product?

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  1. 4 August, 22:45
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    In the given problem above, the concentration of the substance actually decreases over a period of 40 minutes from 4.0 M to 2.0 M. This signifies that it is being used up during the reaction; thus, making it a reactant. If its concentration were to increase instead, this would make it a product.
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