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In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the te

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Question: In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?

Options:

  1. ΔH increases.
  2. ΔH decreases.
  3. ΔH remains constant.
  4. ΔH becomes negative.

Correct Answer: ΔH increases.

Solution: 

According to Le Chatelier\'s principle, increasing temperature shifts the equilibrium position, which can affect the enthalpy change (ΔH) depending on the reaction.

In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the te

Practice Questions

Q1
In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
  1. ΔH increases.
  2. ΔH decreases.
  3. ΔH remains constant.
  4. ΔH becomes negative.

Questions & Step-by-Step Solutions

In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
  • Step 1: Understand that a chemical reaction can reach a state called equilibrium, where the forward and reverse reactions occur at the same rate.
  • Step 2: Know that enthalpy change (ΔH) refers to the heat energy change during a reaction.
  • Step 3: Learn about Le Chatelier's principle, which states that if a system at equilibrium is disturbed, it will adjust to counteract the disturbance.
  • Step 4: Recognize that increasing the temperature adds heat to the system.
  • Step 5: Determine how the reaction responds to the added heat: if the reaction is exothermic (releases heat), it will shift to the left (favoring reactants) to absorb the extra heat.
  • Step 6: If the reaction is endothermic (absorbs heat), it will shift to the right (favoring products) to use the extra heat.
  • Step 7: Conclude that the enthalpy change (ΔH) remains the same for the reaction itself, but the position of equilibrium changes based on whether the reaction is exothermic or endothermic.
  • 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.
  • Enthalpy Change (ΔH) – The heat content change of a system at constant pressure, which can be influenced by temperature changes in a reaction.
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