AP Chemistryeasymcq1 pt
Which process is exothermic?
A.Combustion of methane
B.Melting ice
C.Photosynthesis
D.Evaporation of water
Explanation
Core Concept
Combustion releases heat to the surroundings, so ΔH < 0 — exothermic. The products (CO₂, H₂O) sit lower in enthalpy than the reactants.
Correct Answer
ACombustion of methane
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 →