Chemical synthesis — Question 3

3

a)

• provides correct reactants and products [1 mark]

• correctly balances the equation [1 mark]

• indicates that yeast is required as a catalyst [1 mark]

b)

• shows substitution correctly performed [1 mark]

• determines atom economy [1 mark]

Allow FT error from incorrect molar masses.

Do not penalise for incorrect decimal places/significant figures.

c)

$\mathrm{H}\mathrm{y}\mathrm{d}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\,\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{m}\,\mathrm{e}\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{o}\mathrm{m}\mathrm{y}\,=\,100\%\,$

$\mathrm{F}\mathrm{e}\mathrm{r}\mathrm{m}\mathrm{e}\mathrm{n}\mathrm{t}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\,\mathrm{a}\mathrm{t}\mathrm{o}\mathrm{m}\,\mathrm{e}\mathrm{c}\mathrm{o}\mathrm{n}\mathrm{o}\mathrm{m}\mathrm{y}\,=\,51\%\,$

$\mathrm{T}\mathrm{h}\mathrm{e}\mathrm{r}\mathrm{e}\mathrm{f}\mathrm{o}\mathrm{r}\mathrm{e},\,\mathrm{p}\mathrm{r}\mathrm{o}\mathrm{d}\mathrm{u}\mathrm{c}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\,\mathrm{o}\mathrm{f}\,\mathrm{e}\mathrm{t}\mathrm{h}\mathrm{e}\mathrm{n}\mathrm{e}\,\mathrm{b}\mathrm{y}\,\mathrm{h}\mathrm{y}\mathrm{d}\mathrm{r}\mathrm{a}\mathrm{t}\mathrm{i}\mathrm{o}\mathrm{n}\,\mathrm{i}\mathrm{s}\,\mathrm{g}\mathrm{r}\mathrm{e}\mathrm{e}\mathrm{n}\mathrm{e}\mathrm{r}.\,$

• determines atom economy for hydration reaction is 100% [1 mark]

• identifies that hydration reaction is greener [1 mark]

d)

Use of renewable feedstocks Design for energy efficiency

• provides use of renewable feedstocks [1 mark]

• provides design for energy efficiency [1 mark]