MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryThermodynamics and ThermochemistryConcept of Heat and Work
A sample of liquid in a thermally insulated container (a calorimeter) is stirred by a motor. Taking liquid as a system for this process choose the appropriate option:
A.w < 0; q = 0; ∆U = 0
B.w > 0; q > 0; ∆U > 0
C.w < 0; q > 0; ∆U = 0
D.w > 0; q = 0; ∆U > 0✓ Correct
Explanation
It is stirred. Since energy is provided, positive work is done on the system. Since its isolated, q 0 . By 1st law, U q w q = 0 & w > 0 so ∆U > ∆q
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