What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
Practice Questions
1 question
Q1
What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
It makes ΔG more negative.
It makes ΔG less negative.
It has no effect on ΔG.
It makes ΔG positive.
Increasing temperature will make ΔG more negative for a reaction with a negative ΔH and positive ΔS, enhancing spontaneity.
Questions & Step-by-step Solutions
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Q
Q: What is the effect of increasing temperature on a reaction with a negative ΔH and positive ΔS?
Solution: Increasing temperature will make ΔG more negative for a reaction with a negative ΔH and positive ΔS, enhancing spontaneity.
Steps: 7
Step 1: Understand the terms ΔH and ΔS. ΔH is the change in enthalpy (heat content) of the reaction, and ΔS is the change in entropy (disorder) of the system.
Step 2: Recognize that a negative ΔH means the reaction releases heat, making it exothermic.
Step 3: A positive ΔS indicates that the disorder of the system increases, which is favorable for spontaneity.
Step 4: Recall the Gibbs free energy equation: ΔG = ΔH - TΔS, where T is the temperature in Kelvin.
Step 5: Note that as temperature (T) increases, the term TΔS becomes larger because ΔS is positive.
Step 6: Since ΔH is negative, increasing T will make the negative TΔS term larger in magnitude, which makes ΔG more negative overall.
Step 7: A more negative ΔG means the reaction is more spontaneous, meaning it is more likely to occur.
