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.