Answers section
Questions 3.1.7(a)
- Identify (a) one product of incomplete combustion of alkanes, and (b) two products of complete combustion of alkanes.
- Write an equation for the complete burning of (a) methane and (b) butane in air.
- Study the burning of candle wax and kerosene keenly. Do alkanes burn as liquids or in gaseous state? Explain your answer.
Answers to Questions 3.1.7(a) 
- (a) Carbon (soot), and carbon (II) oxide (b) Products of complete combustion are steam (water) and carbon (IV) oxide (from the topic, Water and Hydrogen).
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Plate 3.1.7(a):Answer to Questions 3.1.7(a) No 2
- Alkanes burn in gaseous state, not in liquid or solid state. Molten wax (liquid) drips down without vatching fire or burning. Or, burning occurs on some invisible matter, which must be a gas, around a dry wick but not on the exposed liquid kerosene or molten wax surface.