The graph shown below depicts the relationship between concentration and time for the following chemical reaction. The slope of this line is equal to ________.

Question

The graph shown below depicts the relationship between concentration and time for the following chemical reaction.  The slope of this line is equal to ________.

Quizplus · Accepted Answer

The slope of the concentration-time graph for a first-order reaction is equal to the rate constant (k) of the reaction. Therefore, the best choice is D, which states that the slope is equal to -k, and also implies that the slope has units of inverse time (-1/s or -s^-1). Choice A and E are both incorrect, as they state that the slope is equal to k or 1/k, respectively, which is not true for a first-order reaction. Choice C is also incorrect, as it does not make sense as an answer choice.

The Graph Shown Below Depicts the Relationship Between Concentration and Time