Chemistry B (Salters) H033 Salters: Developing fuels Topical Past Paper Questions

Go to the chromatogram labelled ‘Using ethanoic anhydride’ and cross out the spot in the column labelled ‘A’. Replace it with a spot of the same size slightly higher up the chromatogram. This new spot should be level with the corresponding spot in the column also labelled ‘A’ on…

Cyanogen, N≡C−C≡N, is a gas which gives a very hot flame when it burns. $$ \mathrm{N}\equiv\mathrm{C}-\mathrm{C}\equiv\mathrm{N}(\mathrm{g})+\mathrm{O}_{2}(\mathrm{g})\rightarrow2\mathrm{CO}(\mathrm{g})+\mathrm{N}_{2}(\mathrm{g})\qquad\Delta_{\mathrm{r}}H=-529\mathrm{kJ}\mathrm{m…

Phenyl ethanoate is used to flavour sweets. A group of students make phenyl ethanoate. The students dissolve 15g of phenol in sodium hydroxide, cool with ice and add 24g of ethanoic anhydride. (a) The reaction is: $$ \underset{(phenol)}{C_{6}H_{5}OH}+\underset{(ethanoic~anhydride…