Chemistry Practice Problems Average Rate of Reaction Practice Problems Solution: You study the rate of a reaction, measuring both t...

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Solution: 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.

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: 

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.

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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