Crude oil is separated into useful fractions using fractional distillation.
The table below shows the percentages of crude oil fractions from different oil wells.
| Fraction | Percentage of fraction in Well A | Percentage of fraction in Well B | Percentage of fraction in Well C |
|---|---|---|---|
| Refinery gas | 2 | 4 | 6 |
| Gasoline | 8 | 15 | 25 |
| Kerosene | 12 | 16 | 14 |
| Diesel | 18 | 20 | 15 |
| Fuel oil | 22 | 25 | 30 |
| Residue | 38 | 20 | 10 |
A barrel of crude oil from Well B has a mass of 165 kg165\text{ kg}165 kg. Calculate the mass of kerosene in this barrel.
Alkanes have the general formula CnH2n+2\text{C}_n\text{H}_{2n+2}CnH2n+2. Write the formula of icosane, the alkane with 20 carbon atoms.
A sample of hexadecane, C16H34\text{C}_{16}\text{H}_{34}C16H34, was cracked. One molecule of hexadecane produced three molecules of ethene, C2H4\text{C}_2\text{H}_4C2H4, and one molecule of product YYY.
C16H34→3C2H4+product Y \text{C}_{16}\text{H}_{34} \rightarrow 3\text{C}_2\text{H}_4 + \text{product } Y C16H34→3C2H4+product YWrite the chemical formula for product YYY.
83 exam-style questions on OCR GCSE Chemistry Organic chemistry. Each one has a worked solution and a mark scheme showing where the marks go.