Gasoline is a mixture of numerous different hydrocarbons: alkanes (paraffins), cycloalkanes and alkenes (olefins).

You are watching: Which best describes the heat that you can feel on the engine of a running car?

Balanced chemistry reaction of gasoline combustion:

C₈H₁₈ + 25/2O₂ → 8CO₂ + 9H₂O + energy.

One part of energy developed in burning of gasoline is supplied for automobile ungine (kinetic energy) and also other component of that power (in form of heat) is lost to the surronding and also engine does not use it.




The heat is unusable and is being lost to the neighboring -- assuming that the engine has reached operating temperature and also is not raising or diminish in temperature. 
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