This reaction occurs at a measurable rate only when the finely divided catalyst is present. This catalyst increases the reaction rate because A. it strongly attracts the reaction products, driving the reaction to the right. B. the reactants can become attached to its surface where they can meet and undergo reaction. C. it provides energy to the reactants when their molecules bounce off it, increasing the proportion of molecules in the gas state with the required activation energy. D. it increases the equilibrium constant of the reaction, causing an increase in the proportion of products at equilibrium.

SSCE VCE Chemistry Rates of Chemical Reactions: This reaction occurs at a measur

This reaction occurs at a measurable rate only when the finely divided catalyst is present - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1

Question 2

This reaction occurs at a measurable rate only when the finely divided catalyst is present. This catalyst increases the reaction rate because A. it strongly attracts... show full transcript

Worked Solution & Example Answer:This reaction occurs at a measurable rate only when the finely divided catalyst is present - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1

Step 1

A. it strongly attracts the reaction products, driving the reaction to the right.

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Answer

This statement is incorrect. A catalyst does not affect the position of equilibrium or the direction in which the reaction proceeds. It only facilitates the rate of reaction.

Step 2

B. the reactants can become attached to its surface where they can meet and undergo reaction.

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Answer

This statement is correct. Catalysts provide a surface where reactants can adsorb, allowing them to collide more effectively and thus increasing the rate of reaction.

Step 3

C. it provides energy to the reactants when their molecules bounce off it, increasing the proportion of molecules in the gas state with the required activation energy.

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Answer

This statement is partially true, as catalysts can lower the activation energy required for reactions. However, they do not provide energy; rather, they create an alternate pathway with lower energy requirements.

Step 4

D. it increases the equilibrium constant of the reaction, causing an increase in the proportion of products at equilibrium.

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Answer

This statement is incorrect. A catalyst does not affect the equilibrium constant; it only speeds up the rate at which equilibrium is reached without changing the equilibrium position.

This reaction occurs at a measurable rate only when the finely divided catalyst is present - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1

Worked Solution & Example Answer:This reaction occurs at a measurable rate only when the finely divided catalyst is present - VCE - SSCE Chemistry - Question 2 - 2008 - Paper 1

A. it strongly attracts the reaction products, driving the reaction to the right.

B. the reactants can become attached to its surface where they can meet and undergo reaction.

C. it provides energy to the reactants when their molecules bounce off it, increasing the proportion of molecules in the gas state with the required activation energy.

D. it increases the equilibrium constant of the reaction, causing an increase in the proportion of products at equilibrium.

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