In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
Practice Questions
1 question
Q1
In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
ΔH increases.
ΔH decreases.
ΔH remains constant.
ΔH becomes negative.
According to Le Chatelier's principle, increasing temperature shifts the equilibrium position, which can affect the enthalpy change (ΔH) depending on the reaction.
Questions & Step-by-step Solutions
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Q
Q: In a reaction at equilibrium, what happens to the enthalpy change (ΔH) if the temperature is increased?
Solution: According to Le Chatelier's principle, increasing temperature shifts the equilibrium position, which can affect the enthalpy change (ΔH) depending on the reaction.
Steps: 7
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.
