Carbon Dioxide 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 carbon dioxide gas?
- A. A lighted splint
- B. Damp litmus paper
- C. Limewater
- D. Silver nitrate solution
2. What is the positive result for the carbon dioxide test?
- A. The limewater turns cloudy white
- B. The limewater turns blue
- C. A squeaky pop is heard
- D. The limewater turns pink
3. What is limewater a solution of?
- A. Sodium hydroxide
- B. Calcium hydroxide
- C. Calcium carbonate
- D. Calcium chloride
4. Why does limewater go cloudy when carbon dioxide is passed through it?
- A. The gas cools the solution
- B. Insoluble calcium carbonate forms as a precipitate
- C. Carbon dioxide is coloured
- D. The water evaporates
5. A student bubbles gas from a reaction through limewater and sees no change. What can they conclude?
- A. The gas is definitely hydrogen
- B. The gas is definitely oxygen
- C. The gas is unlikely to be carbon dioxide
- D. The gas must be ammonia