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In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what

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Question: In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what will be the effect on the equilibrium if the reaction is exothermic? (2020)

Options:

  1. The equilibrium shifts to the left
  2. The equilibrium shifts to the right
  3. No effect on the equilibrium
  4. The reaction rate increases

Correct Answer: The equilibrium shifts to the left

Exam Year: 2020

Solution: 

For an exothermic reaction, increasing the temperature shifts the equilibrium to the left (towards the reactants) to absorb the added heat, according to Le Chatelier\'s principle.

In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what

Practice Questions

Q1
In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what will be the effect on the equilibrium if the reaction is exothermic? (2020)
  1. The equilibrium shifts to the left
  2. The equilibrium shifts to the right
  3. No effect on the equilibrium
  4. The reaction rate increases

Questions & Step-by-Step Solutions

In the reaction A(g) + B(g) ⇌ C(g) + D(g), if the temperature is increased, what will be the effect on the equilibrium if the reaction is exothermic? (2020)
  • Step 1: Understand that the reaction A(g) + B(g) ⇌ C(g) + D(g) can go in both directions: from reactants (A and B) to products (C and D) and back.
  • Step 2: Identify that this reaction is exothermic, meaning it releases heat when it goes from reactants to products.
  • Step 3: Recognize that increasing the temperature adds heat to the system.
  • Step 4: Apply Le Chatelier's principle, which states that if a change is made to a system at equilibrium, the system will adjust to counteract that change.
  • Step 5: Since the reaction releases heat, increasing the temperature will cause the equilibrium to shift in the direction that absorbs heat, which is towards the reactants (A and B).
  • Step 6: Conclude that the effect of increasing the temperature on this exothermic reaction is to shift the equilibrium to the left.
  • Le Chatelier's Principle – A principle stating that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change.
  • Exothermic Reactions – Reactions that release heat, resulting in a temperature increase in the surroundings.
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