Chemistry
Grade-7
Easy

Question

Which of the following statements regarding how soap cleans is true?

  1. Water dissolves the hydrophilic portion of soap molecules.
  2. The soap increases the water's surface tension.
  3. Water is emulsified by soap molecules.
  4. Salt is formed when it reacts with acids.

hintHint:

The soap molecules are tadpole-like structures.

The correct answer is: Water dissolves the hydrophilic portion of soap molecules.


    • The statement "Water dissolves the hydrophilic portion of soap molecules" is true regarding how soap cleans. 
    • Soap, water, and oil are all made up of molecules. Some molecules are hydrophilic (hydro = water and phillic = loving) These molecules are attracted to water.
    • Some molecules are hydrophobic (hydro = water and phobic = fear) and are repelled by water.
    • Anything that mixes with water is hydrophilic.
    • Oils and anything that mixes with oils are hydrophobic.

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