Suggest a suitable temperature for the furnace in Figure 1 - AQA - GCSE Chemistry - Question 1 - 2019 - Paper 2

Diesel oil collects above heavy fuel oil because it has a lower boiling point than heavy fuel oil, allowing it to vaporize at a lower temperature. Conversely, it collects below kerosene, as kerosene has a higher boiling point, meaning diesel oil condenses at a temperature above that of kerosene.

1. Bitumen is too viscous, making it difficult to flow and ignite.
2. It is not very flammable, which reduces its effectiveness as a fuel.

The compound that is an alkane is C₄H₈.

The conditions needed include high temperatures, typically above 320 °C, and the presence of a catalyst such as steam or a porous pot.

Large hydrocarbon molecules are cracked to meet the greater demand for smaller, more useful hydrocarbon molecules. Smaller molecules are often more useful as fuels and can be used to make alkenes or polymers.

C₁₅H₃₂ → C₁₂H₂₆ + C₃H₈