CAIE IGCSE Chemistry 11.6.4 Advantages and Disadvantages of the Questions

Work through real CAIE IGCSE Chemistry questions to compare renewable feedstock, energy, purity, rate, process type and disadvantages of ethanol routes.

Exam points

state fermentation advantages including renewable carbohydrate feedstock and lower temperature or pressure
state catalytic steam-addition advantages including purer product, faster reaction and continuous production
state disadvantages of fermentation including slow or batch operation, distillation, low maximum concentration and yeast inhibition
state disadvantages of catalytic addition including non-renewable ethene feedstock and high temperature or pressure, and compare both routes

[Maximum number: 1]

What is an advantage of manufacturing ethanol by fermentation rather than by the addition of steam to ethene?

No gases that cause global warming are produced.

The ethanol that is produced is pure.

Fermentation is a fast process.

Fermentation uses renewable raw materials.

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CAIE IGCSE Chemistry 11.6.4 Advantages and Disadvantages of the Questions question 1