A technician uses propene as the fuel in a burner. Soot forms when the air inlet is nearly closed. Opening the inlet causes less soot to form.
Why does opening the air inlet cause less soot to form?
A larger oxygen supply makes carbon monoxide the main product.
A larger oxygen supply allows more complete combustion.
The incoming air lowers the carbon-to-hydrogen ratio of propene.
The incoming air changes propene into an alkane before combustion.
97 exam-style questions on AQA GCSE Chemistry 7.2 Reactions of alkenes and alcohols, covering 7.2.1 Structure and formulae of alkenes, 7.2.2 Reactions of alkenes, 7.2.3 Alcohols, 7.2.4a Carboxylic acids, and 7.2.4b Carboxylic acids as weak acids. Each one has a worked solution and a mark scheme showing where the marks go.