AP Chemistryeasymcq1 pt
Bond breaking is always
A.Endothermic
B.Exothermic
C.Thermally neutral
D.Impossible
Explanation
Core Concept
Separating bonded atoms requires an energy input — the bond enthalpy. Bond formation releases the same amount, which is how net ΔH emerges from the difference.
Correct Answer
AEndothermic
More Unit 6: Thermodynamics practice questions
- mediumA heating curve's plateau lengths differ because
- mediumWhich statement about work in chemistry is correct?
- mediumGiven: 2H₂ + O₂ → 2H₂O, ΔH = −571.6 kJ. What is ΔH per mole of water formed?
- mediumWhich statement about enthalpy of formation reactions is correct?
- mediumThe same amount of heat raises iron's temperature more than water's. Why?
Practice more AP Chemistry questions with full explanations
Practice Unit 6: Thermodynamics Questions →