Consider the following equilibrium. $$2X(g) + Y(g) \rightleftharpoons 2Z(g)$$ where $\Delta H$ is positive. A catalyst is added to the equilibrium mixture at time $t$. The temperature and volume of the mixture remain constant. Which one of the following graphs best represents the change in the equilibrium ratio $\frac{[Z]}{[X]}$? A. B. C. D.

SSCE VCE Chemistry Extent of Chemical Reactions: Consider the following equilibri

Consider the following equilibrium - VCE - SSCE Chemistry - Question 2 - 2011 - Paper 1

Question 2

Consider the following equilibrium. $$2X(g) + Y(g) \rightleftharpoons 2Z(g)$$ where $\Delta H$ is positive. A catalyst is added to the equilibrium mixture at time... show full transcript

Worked Solution & Example Answer:Consider the following equilibrium - VCE - SSCE Chemistry - Question 2 - 2011 - Paper 1

Step 1

A catalyst is added to the equilibrium mixture at time $t$

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Answer

Adding a catalyst to an equilibrium system affects the rate of the forward and reverse reactions equally without shifting the position of the equilibrium. Therefore, the equilibrium constant remains unchanged, and the ratio $\frac{[Z]}{[X]}$ will not change over time.

The correct graph would show that the equilibrium ratio remains constant after the addition of the catalyst. Thus, option A illustrates this scenario best as it represents a horizontal line after the initial time $t$ , indicating a stable equilibrium ratio over time.

Consider the following equilibrium - VCE - SSCE Chemistry - Question 2 - 2011 - Paper 1

Worked Solution & Example Answer:Consider the following equilibrium - VCE - SSCE Chemistry - Question 2 - 2011 - Paper 1

A catalyst is added to the equilibrium mixture at time $t$

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