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WAEC Chemistry 2010 Paper

Question : 32

Total: 38

The products of fermentation of sugar are

Solution:

Concept:

Fermentation of sugar by yeast is an anaerobic process that converts glucose into ethanol and carbon(IV) oxide.

Explanation:

Yeast provides enzymes that break down glucose without oxygen. The balanced equation is:

\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 \rightarrow 2\mathrm{C}_2\mathrm{H}_5\mathrm{OH} + 2\mathrm{CO}_2

This shows glucose produces ethanol and carbon(IV) oxide as the main products.

Answer:

B. ethanol and carbon(IV) oxide

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