Use a word from the box to complete each of the sentences about the properties and processing of hydrocarbon fuels.
| boiling | cracking | ignited | condensed | viscous |
Each word may be used once, more than once, or not at all. Fractions obtained from crude oil have different physical properties depending on the size of their molecules.
Hydrocarbons with larger molecules are thicker, flow less easily, and are described as being more .....
To break down these larger, less useful hydrocarbons into smaller, more useful fuel molecules, they undergo a thermal decomposition process called .....
130 exam-style questions on Edexcel GCSE Chemistry 9.1 Fuels, covering 9.1.1 Hydrocarbons and crude oil, 9.1.2 Fractional distillation of crude oil and its fractions, 9.1.3 The alkanes as a homologous series, 9.1.4 Complete and incomplete combustion, 9.1.5 Pollutants from burning fuels, 9.1.6 Hydrogen as a fuel and non-renewable fossil fuels, and 9.1.7 Cracking of larger alkanes. Each one has a worked solution and a mark scheme showing where the marks go.