Hi! I'm a 11th grade homeschooled student. I'm currently learning chemistry on my own and came across this question while I was practicing:
A particular reaction is spontaneous up to 475 K and becomes non-spontaneous at temperatures above 475 K. Is this reaction exothermic or endothermic? Does entropy increase or decrease during this reaction?
From what I understand, the enthalpy change will be negative and entropy change will also be negative. Hence, the reaction is exothermic.
The person correcting my questions said it's wrong. I would really appreciate it if someone can help me answer this. Thank you!