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Homework answers / question archive / Explain the cooling effect that you experience when ethanol is rubbed on your skin and then evaporates

Explain the cooling effect that you experience when ethanol is rubbed on your skin and then evaporates

Chemistry

Explain the cooling effect that you experience when ethanol is rubbed on your skin and then evaporates.

This process can be written as C2H5OH (l) ________> C2H5OH (g) ?H = + 42.2kJ

Choose the BEST response from the following:

(a) The skin breaks down and releases energy.

(b) The ethanol uses heat energy from the skin to vaporize.

(c) The ethanol molecules release some of their bond energy.

(d) All of the above answers are correct.

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Answer:

When we rubbed ethanol on our skin then it will absorb energy from the skin and evaporation takes place .Due to heat generated by our body ,that much energy is sufficient to evaporate ethanol hence from given options

(b) The ethanol uses heat energy from the skin to vaporize. Is correct.all other options like a,c,and d are not perfectly match with given question.

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