Problem: You study the rate of a reaction, measuring both the concentration of the reactant and the concentration of the product as a function of time, and obtain the following results: Choose equivalent expressions for the rate of the reaction in terms of the appearance or disappearance of the two substances.

FREE Expert Solution

We are being asked to determine the equivalent expressions for the rate of appearance and disappearance of the reactant and product given the graph.


A graph has time on the x-axis and concentration on the y-axis. Both are unscaled. Curve A increases from the origin with a downward concave curve and curve B starts one third of the way up the y-axis and decreases (concave).

Recall: General or Average Rate is the change in the concentration of a compound over a period of time.


Rate = A time

where A is the product

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Problem Details

You study the rate of a reaction, measuring both the concentration of the reactant and the concentration of the product as a function of time, and obtain the following results: 

A graph has time on the x-axis and concentration on the y-axis. Both are unscaled. Curve A increases from the origin with a downward concave curve and curve B starts one third of the way up the y-axis and decreases (concave).

Choose equivalent expressions for the rate of the reaction in terms of the appearance or disappearance of the two substances.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Average Rate of Reaction concept. You can view video lessons to learn Average Rate of Reaction. Or if you need more Average Rate of Reaction practice, you can also practice Average Rate of Reaction practice problems.

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Based on our data, we think this problem is relevant for Professor Velarde's class at UB.