2. (6 points) Consider the plot of the concentration of compound B vs. time in a

Question

2. (6 points) Consider the plot of the concentration of compound B vs. time in a reaction. Based on the inormation in the plot, which of the following statements A-D below must be true? Circle all that apply GASES He Ne 10 8 2 0 40 50 60 30 Time (s) 0 10 20 A. Compound B is a product of the reaction. B. The average rate of reaction between 0 and 10s is higher than the average rate between 30 and 40s. C. By 60s, nearly all of the reagents have been consumed. D. Based on the plot above, it is impossible to be sure that any of the statements above are true.

Explanation / Answer

1] A is correct. since the concentration of B is increasing with time then B must be the product.

2] Average rate is calculated from the ratio of the change in the concentration of B and time difference.

average rate = (change in the concentration of B)/ Time taken

in both the cases mentioned in this part, we have the time difference of 10 sec, but we can see that the change in the concentration of B is much less in 30 to 40 sec than 0-10 sec.

and hence this second statement is also true.

3] by 60 sec the rate of change in the concentration of B is zero. that is the slope of the given line at 60 sec is zero.

this tells us that there is no change in the conc. of B and this can happen only all of the reagents have been consumed, So third statement is also correct.

4] we did conclude that all of the above statements are true and hence this fourth statement is wrong.

A, B, C are correct while D is wrong.

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