Paper 3 · reaction kinetics

In a reaction $X + Y \rightarrow 2Z$ , it was found that doubling the concentration of X caused the rate to increase four times but doubling Y did not affect the rate. What is the rate equation?

ARate =

k[X]^2

BRate =

4k[X]^2

CRate =

4[K]^4

DRate =

4k[X]

Explanation: The marking scheme gives answer A. Doubling [X] quadruples the rate means order with respect to X is 2. Y has no effect so order with respect to Y is 0. Rate = k[X]².

ZIMSEC Chemistry Paper 3, November 2009, Q9

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In a reaction X+Y→2ZX + Y \rightarrow 2ZX+Y→2Z, it was found that doubling the concentration of X caused the rate to increase four times but doubling Y did not affect the rate. What is the rate equation?

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In a reaction $X + Y \rightarrow 2Z$ , it was found that doubling the concentration of X caused the rate to increase four times but doubling Y did not affect the rate. What is the rate equation?