College Chemistry Quiz
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THERMOCHEMISTRY (CALORIMETRY & HESS'S LAW)
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Which statement correctly explains why enthalpy (H) rather than internal energy (U) is more commonly used in chemistry?
A
Most chemical reactions occur at constant pressure, making enthalpy the more directly measurable quantity
B
Enthalpy includes kinetic energy effects while internal energy only accounts for potential energy changes
C
Internal energy calculations require knowledge of molecular velocities which are difficult to measure
D
Enthalpy changes are always larger in magnitude, making them easier to detect experimentally
E
The relationship H = U + PV only applies at standard temperature and pressure conditions
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