Chemistry
Grade-7
Easy
Question
Which of the following statements regarding how soap cleans is true?
- Water dissolves the hydrophilic portion of soap molecules.
- The soap increases the water's surface tension.
- Water is emulsified by soap molecules.
- Salt is formed when it reacts with acids.
Hint:
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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