AP Chemistryhardmcq1 pt
If a reaction's K at 300 K is 50 and at 400 K is 5, which statement is true?
A.The reaction is exothermic
B.The reaction is endothermic
C.The reaction has no activation energy
D.The temperature data are impossible
Explanation
Core Concept
K falls as temperature rises, meaning heat drives the reaction backward — the forward reaction releases heat. Exothermic reactions lose product favorability when heated.
Correct Answer
AThe reaction is exothermic
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