Chemical formulae and equations Quiz
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5 questions, one answer each
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1. What is the formula of chlorine gas?
- A. Cl
- B. Cl₂
- C. Cl₃
- D. 2Cl
2. Which is the balanced equation for the reaction of hydrogen with oxygen?
- A. 2H₂ + O₂ → 2H₂O
- B. H₂ + O₂ → H₂O
- C. H₂ + 2O₂ → 2H₂O
- D. 2H₂ + 2O₂ → 2H₂O
3. Which state symbol shows a substance is dissolved in water?
- A. (s)
- B. (l)
- C. (g)
- D. (aq)
4. A student burns a wooden splint in an open crucible and the ash weighs less than the splint. Why?
- A. Mass is destroyed when things burn
- B. The ash is a different element
- C. Gases formed in the reaction escaped into the air
- D. The splint lost its atoms
5. 12 g of carbon burns completely in 32 g of oxygen in a sealed container. What is the mass of carbon dioxide formed?
- A. 20 g
- B. 44 g
- C. 32 g
- D. 12 g