MCAT Physics Question — Entropy Change
- Apr 30, 2018
- MCAT Question of the Day
At atmospheric pressure, carbon dioxide undergoes sublimation at -109.5°F. How does the entropy change when CO2 undergoes deposition?
D. cannot be determined
Click for Explanation
Deposition is a phase change from gas directly to solid. Less freedom of motion for the elements in a solid translates into less entropy: ΔS<0.
A. ΔS>0, incorrect, A solid arrangement of packed molecules is lower in probability than freely moving gas particles.
B. ΔS<0, correct.
C. ΔS=0, incorrect, Gas phases have greater entropy than solid phases.
D. cannot be determined, incorrect, See answer C.
Want more MCAT practice?
We’ve got options for every schedule and learning style!
From the best online MCAT course created by top instructors with 524+ MCAT scores to the most representative full-length practice exams and private tutoring, we can custom tailor your MCAT prep to your goals!
Not sure which option is right for you? Schedule a free MCAT consultation with an MCAT expert using the form below. No obligation, just expert advice.
Search the Blog
Free ConsultationSchedule Now
MCAT Blog How to Review MCAT Full-Lengths
Free MCAT Practice AccountNeed great MCAT practice?
Get the most representative MCAT practice possible when you sign up for our free MCAT Account, which includes a half-length diagnostic exam and one of our full-length MCAT practice exams.Learn More