Balanced equations, yield and atom economy Quiz
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5 questions, one answer each
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1. In the balanced equation Fe₂O₃ + 3CO → 2Fe + xCO₂, what is x?
- A. 1
- B. 2
- C. 3
- D. 6
2. What is the percentage atom economy for making copper in CuO + H₂ → Cu + H₂O (Mr: CuO = 79.5, H₂ = 2.0, Cu = 63.5)?
- A. 77.9%
- B. 79.9%
- C. 100%
- D. 31.8%
3. A reaction has a theoretical yield of 12.0 g. 8.40 g of product is obtained. What is the percentage yield?
- A. 30.0%
- B. 70.0%
- C. 1.43%
- D. 143%
4. What volume of 0.200 mol dm⁻³ NaOH neutralises 25.0 cm³ of 0.100 mol dm⁻³ H₂SO₄? (H₂SO₄ + 2NaOH → Na₂SO₄ + 2H₂O)
- A. 12.5 cm³
- B. 50.0 cm³
- C. 6.25 cm³
- D. 25.0 cm³
5. Which ions are spectator ions when aqueous silver nitrate reacts with aqueous sodium chloride?
- A. Ag⁺ and Cl⁻
- B. Na⁺ and NO₃⁻
- C. Ag⁺ and NO₃⁻
- D. Na⁺ and Cl⁻