Yield and Atom Economy Quiz
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5 questions, one answer each
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1. A student carries out a reaction to produce copper oxide. The theoretical yield is 16 g, but they actually obtain 12 g. What is the percentage yield?
- A. 75%
- B. 80%
- C. 25%
- D. 133%
2. Why is the actual yield of a chemical reaction often less than the theoretical yield?
- A. Because theoretical yield assumes 100% conversion and accounts for incomplete reactions, side reactions, and losses during purification
- B. Because the theoretical yield is always calculated incorrectly
- C. Because actual yield cannot be measured accurately
- D. Because the reaction rate is too slow
3. For the reaction: 2C + O₂ → 2CO, what is the atom economy if carbon monoxide is the desired product? (Ar: C = 12, O = 16)
- A. 94.1%
- B. 85.7%
- C. 100%
- D. 50%
4. A chemist performs an experiment with theoretical yield of 24 g and obtains an actual yield of 18 g. Another chemist performs a different reaction with theoretical yield of 50 g and actual yield of 40 g. Which reaction was more successful?
- A. The first reaction, because it produced more product
- B. The second reaction, because it produced more product
- C. The second reaction, because it has a higher percentage yield of 80%
- D. Both reactions were equally successful in terms of percentage yield
5. Why is atom economy an important consideration in industrial chemistry, particularly regarding sustainability?
- A. High atom economy reduces waste, saves raw materials, and lowers production costs, making manufacturing more economically and environmentally sustainable
- B. Atom economy is only relevant for laboratory experiments
- C. High atom economy guarantees that percentage yield will be 100%
- D. Reactions with low atom economy are impossible to perform