Le Châtelier's Principle & Catalysts
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Questions and Answers

What is the primary effect of a catalyst on a chemical reaction?

  • It lowers the activation energy barrier (correct)
  • It changes the equilibrium constant of the reaction
  • It increases the activation energy barrier
  • It alters the reaction mechanism completely

Which of the following statements is true about catalysis?

  • Catalysis affects the equilibrium constant of the reaction
  • Catalysis always increases the rate of reaction
  • Catalysis only works for reversible reactions
  • Catalysis lowers the activation energy barrier for the reaction (correct)

What does a catalyst not affect in a chemical reaction?

  • The activation energy barrier
  • The reaction mechanism
  • The rate of reaction
  • The equilibrium constant of the reaction (correct)

How does a catalyst affect the rate of reaction?

<p>It increases the rate of reaction by lowering the activation energy barrier (A)</p> Signup and view all the answers

What is the relationship between the activation energy barrier and the rate of reaction?

<p>A higher activation energy barrier means a slower rate of reaction (D)</p> Signup and view all the answers

What is the effect of a catalyst on the composition of the equilibrium mixture?

<p>It has no effect (B)</p> Signup and view all the answers

What is the role of a catalyst in a reversible reaction?

<p>To increase the rate of the forward reaction (C)</p> Signup and view all the answers

What happens to the rate of reaction when a catalyst is added?

<p>It increases (C)</p> Signup and view all the answers

What is the effect of a catalyst on the equilibrium constant of a reversible reaction?

<p>It has no effect on the equilibrium constant (D)</p> Signup and view all the answers

Why does a catalyst decrease the time taken to reach equilibrium?

<p>Because it increases the rate of the forward reaction (B)</p> Signup and view all the answers

At what temperature range is the catalyst bed kept?

<p>460 - 550 ºC (A)</p> Signup and view all the answers

What is the purpose of the heating coil in the process?

<p>To heat the gases to the desired temperature (A)</p> Signup and view all the answers

What condition is required to maintain the catalyst bed at the desired temperature?

<p>High pressure (B)</p> Signup and view all the answers

What is the likely role of the catalyst bed in the process?

<p>To speed up the reaction (A)</p> Signup and view all the answers

What would be the expected result if the catalyst bed was not pre-heated?

<p>The reaction would occur at a slower rate (D)</p> Signup and view all the answers

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