When the concentration of a reactant is increased which of the following is true?

the rate of reaction always decreases
the rate of reaction usually decreases
the rate of reaction always increases
the rate of reaction usually increases

Answer:
D) The rate of reaction usually increases. (but doesn't always)
None of the above. The reactant must be involved in the rate-limiting (slow) step of a reaction for one to draw any conclusions.

I'm going to send you a bill pretty soon, notachemwiz! LOL
Well, i would say that the rate of reaction USUALLY increases. I think this because it depends on the order of the reaction with respect to the reactant, for example of the order of reaction is zero, increasing the reactant would have no effect on the rate. But if it had an order of 1 or more, then it would definatley increase the rate of reaction.

I hope this helps you out.

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