(a(i))[2]
Complete the balanced chemical equation to show how yeast respiration produces ethanol: $\text{glucose} \rightarrow \text{ethanol} + \text{carbon dioxide}$.
(a(ii))[3]
Using the details in Fig. 4.1, suggest the environmental benefits of using ethanol as a fuel.
(a(iii))[2]
Describe the disadvantages of growing giant reed plants to supply biomass for biofuel production.
(b(i))[3]
Describe the results presented in Fig. 4.2.
(b(ii))[1]
Predict the results you would expect for ethanol concentration.