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What happens to the surface tension of water when a surfactant is added?

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Question: What happens to the surface tension of water when a surfactant is added?

Options:

  1. Increases
  2. Decreases
  3. Remains the same
  4. Becomes zero

Correct Answer: Decreases

Solution: 

Adding a surfactant decreases the surface tension of water by disrupting the cohesive forces between water molecules.

What happens to the surface tension of water when a surfactant is added?

Practice Questions

Q1
What happens to the surface tension of water when a surfactant is added?
  1. Increases
  2. Decreases
  3. Remains the same
  4. Becomes zero

Questions & Step-by-Step Solutions

What happens to the surface tension of water when a surfactant is added?
Correct Answer: Surface tension decreases.
  • Step 1: Understand what surface tension is. Surface tension is the force that makes the surface of water behave like a stretched elastic sheet.
  • Step 2: Know that water molecules are attracted to each other. This attraction creates strong cohesive forces at the surface.
  • Step 3: Learn what a surfactant is. A surfactant is a substance that reduces the surface tension of a liquid.
  • Step 4: When a surfactant is added to water, it mixes with the water and spreads out on the surface.
  • Step 5: The surfactant molecules disrupt the cohesive forces between the water molecules.
  • Step 6: As a result, the surface tension of the water decreases, making it easier for things to float or spread on the surface.
  • Surface Tension – The cohesive forces between liquid molecules at the surface that create a 'film' effect.
  • Surfactants – Substances that reduce the surface tension of a liquid by disrupting intermolecular forces.
  • Cohesive Forces – The attractive forces between molecules of the same substance, which in water are primarily hydrogen bonds.
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