McGraw-Hill Education SAT Elite 2021 by Christopher Black

Author:Christopher Black
Language: eng
Format: epub
Publisher: McGraw-Hill Education
Published: 2020-08-15T00:00:00+00:00

(Hard) Comparing the first two rows shows that tripling the concentration of A also triples the rate of reaction, so the rate of reaction varies directly as the concentration of A. Comparing the first row to the third row shows that tripling the concentration of B does not affect the rate of reaction; therefore, there is no variation relationship between the rate of reaction and the concentration of B. Comparing the first row to the fourth row, note that the concentration of A has doubled, so we should expect the reaction rate to double to 8.0. However, the actual rate of reaction is 32.0, which is 4 times the expected rate. This is because the concentration of C has doubled. (We can ignore the concentration of B because it has no effect on the reaction rate.) Since doubling the concentration of C causes the reaction rate to quadruple from what it would otherwise be, the rate of reaction varies directly as the square of the concentration of C. Therefore, the correct answer is A.

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