A long-chain alkane found in crude oil is eicosane, C20H42\text{C}_{20}\text{H}_{42}C20H42.
Complete the equation for the catalytic cracking of one molecule of C20H42\text{C}_{20}\text{H}_{42}C20H42 to form two molecules of butene (C4H8\text{C}_4\text{H}_8C4H8) and one molecule of another hydrocarbon, ZZZ.
C20H42→2C4H8+... \text{C}_{20}\text{H}_{42} \rightarrow 2\text{C}_4\text{H}_8 + \text{...} C20H42→2C4H8+...Explain whether hydrocarbon ZZZ is saturated or unsaturated.
An organic impurity found in some crude oil supplies has a relative molecular mass (MrM_rMr) of 114114114. It contains carbon, hydrogen, and oxygen atoms in a 3:5:13:5:13:5:1 ratio. Determine the molecular formula of this impurity. [Relative atomic masses: H=1\text{H} = 1H=1, C=12\text{C} = 12C=12, O=16\text{O} = 16O=16]
19 exam-style questions on Edexcel IGCSE Chemistry Crude oil. Each one has a worked solution and a mark scheme showing where the marks go.