Apentix/AP Chemistry/Unit 6: Thermodynamics/Question

AP Chemistrymediummcq1 pt

Why do bond-enthalpy calculations give only approximate ΔH values?

A.Bond enthalpies are averages across many molecules

B.Bond enthalpies apply only to gases

C.Bond energies are measured at 0 K

D.Bond breaking releases energy

Explanation

Core Concept

A C–H bond in CH₄ differs slightly from one in CHCl₃, but tables list one averaged value. The approximation is good to a few kJ, not exact.

Correct Answer

ABond enthalpies are averages across many molecules

More Unit 6: Thermodynamics practice questions

Try a random question →

Practice more AP Chemistry questions with full explanations

Practice Unit 6: Thermodynamics Questions →