Writing and balancing equations Quiz
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5 questions, one answer each
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1. Which is the balanced equation for the formation of water?
- A. H₂ + O₂ → H₂O
- B. 2H₂ + O₂ → 2H₂O
- C. H₂ + 2O₂ → 2H₂O
- D. 2H + O → H₂O
2. What does the state symbol (aq) mean?
- A. Solid
- B. Liquid
- C. Dissolved in water
- D. Gas
3. Why can you not balance an equation by changing H₂O to H₂O₂?
- A. It would change the substance into hydrogen peroxide
- B. It would not change anything
- C. H₂O₂ is a gas
- D. Small numbers can be changed freely
4. Iron wool is burned in air and its mass goes up. Which explanation is correct?
- A. Atoms of iron are created
- B. Iron combines with oxygen from the air
- C. Iron turns into energy
- D. The balance is faulty
5. What is the coefficient in front of O₂ in CH₄ + O₂ → CO₂ + H₂O when balanced?
- A. 4
- B. 3
- C. 1
- D. 2