Which process below has the correct sign for ΔHº and correct classification (endothermic or exothermic)?

• A. Photosynthesis (ΔH° = –, Endothermic)
• B. Burning a piece of paper (ΔH° = +, Exothermic)
• C. Baking soda (NaHCO3) neutralizes vinegar (ΔH° = –, Endothermic)
• D. A fireworks display (ΔH° = –, Exothermic)

Answer: (D)