Hydrogen Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. What is used to test for hydrogen gas?
- A. A glowing splint
- B. A lighted splint
- C. Damp litmus paper
- D. Limewater
2. What is the positive result for hydrogen gas?
- A. The splint relights
- B. A squeaky pop
- C. The gas turns limewater cloudy
- D. The splint goes out
3. What product forms when hydrogen burns in air?
- A. Carbon dioxide
- B. Water
- C. Oxygen
- D. Hydrogen chloride
4. Why does the hydrogen test produce a popping sound?
- A. The gas is under high pressure
- B. Hydrogen combusts rapidly with oxygen in the air
- C. The test tube cracks
- D. Hydrogen is denser than air
5. A student tests an unknown gas with a lighted splint and hears a squeaky pop. What can they conclude?
- A. The gas is oxygen
- B. The gas is carbon dioxide
- C. The gas is hydrogen
- D. The gas is ammonia