THPT Chemistry Practice Questions - Ky Thi Tot Nghiep THPT - Mon Hoa Hoc (Vietnam High School Graduation Chemistry Exam) Exam

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Soap is made by boiling a fat with sodium hydroxide. The cleaning action comes from soap molecules having two ends. Which description is correct?

Two polar -COO-Na+ heads at both ends A long nonpolar hydrocarbon tail (lipophilic) and a polar -COO-Na+ head (hydrophilic) A long polar tail and a nonpolar head Only a nonpolar hydrocarbon chain with no charged group

Correct Answer:

A long nonpolar hydrocarbon tail (lipophilic) and a polar -COO-Na+ head (hydrophilic)

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