Alcohol production Quiz
Studying this course? Keep your progress in one place.
Pick an answer for each. Quizzes never use energy.
5 questions, one answer each
Each answer is checked as you go, with why.
See all 5 questions
1. Which reagent and catalyst convert ethene into ethanol industrially?
- A. Steam with an acid catalyst
- B. Aqueous NaOH
- C. Hydrogen with a nickel catalyst
- D. Bromine water
2. Why is fermentation carried out at about 35 °C?
- A. Ethanol boils at 35 °C
- B. Higher temperatures denature the enzymes and lower temperatures are too slow
- C. Yeast is killed at any temperature above 20 °C
- D. Glucose is insoluble at lower temperatures
3. Why is air excluded during fermentation?
- A. Oxygen would oxidise ethanol to ethanoic acid
- B. Oxygen would turn glucose into starch
- C. Oxygen would reduce the yeast
- D. Air would cool the mixture
4. Which equation shows complete combustion of ethanol?
- A. C₂H₅OH + O₂ → 2CO + 3H₂
- B. C₂H₅OH → C₂H₄ + H₂O
- C. C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O
- D. C₂H₅OH + 2O₂ → CO₂ + 3H₂O
5. Which is a reason why ethanol from fermentation is not truly carbon neutral?
- A. Fermentation absorbs carbon dioxide
- B. Fossil fuels are used for farming, transport and distillation
- C. Ethanol contains no carbon
- D. Plants release carbon dioxide at night only