Why does the burning of a tire yield black smoke while burning stoves in homes rarely produce smoke?
Correct answer: B. Combustion of heavy fuels such as tires causes incomplete combustion which yields elemental carbon which is black
- A. Burning tires cause parts of the tires to break off and fly off in the air, causing the appearance of black smoke
- B. Combustion of heavy fuels such as tires causes incomplete combustion which yields elemental carbon which is black
- C. The heat of the fire causes tires to melt and eventually evaporate, as a result, the vapors in the smoke appear black
- D. None of the above options are correct
Explanation
Thick, black smoke indicates heavy fuels that are not being fully consumed. In general, a hotter fire will convert more fuel into elemental carbon, which forms into tiny particles that absorb light and appear in the sky as black smoke.
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About Scientific Reasoning
Scientific reasoning evaluates hypotheses through observations, variables, controls, measurements and experimental results. Questions involve identifying independent and dependent variables, recognising a fair test, interpreting tables or graphs, distinguishing evidence from opinion, and deciding whether data supports, rejects or leaves a hypothesis unresolved.
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