Global Connection: Water Management and Katrina — Cumulative exam
Question 3 • Environmental Science B (WHS)
Hydrogen fuel cells burn with _______ and produce _______.
Answer
A
water, oxygen
B
oxygen, water
C
carbon dioxide, oxygen
D
oxygen, carbon dioxide
Explanation
A hydrogen fuel cell combines hydrogen with oxygen from the air. The reaction produces water: 2H₂ + O₂ → 2H₂O. So the correct choice is “oxygen, water.”
AI-written and checked against the verified answer.