Mon Prof Augmenté
Soap’s Two Ends
Age 9 · Science
A soap molecule has a round head that likes water and a wavy tail that likes grease. When soap meets water and grease, the heads stay in the water while the tails push into the grease.
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Age 9: open this week
Browse Age 9
In the picture
- Round soap head: the end that is attracted to water
- Wavy soap tail: the end that is attracted to grease
- Water area: the blue liquid where the heads gather
- Grease droplet: the yellow blob where the tails gather
Examples
- Washing greasy dishes with soap.
- Scrubbing oily hands with soap and water.
Key takeaways
- Soap molecules have one water-loving end and one grease-loving end.
- The two ends let soap connect water and grease so they can be washed away.
Quiz: Soap’s Two Ends (Age 9)
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What are the two ends of a soap molecule attracted to?
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When soap meets water and grease, where do the round soap heads stay?
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What do soap’s two different ends let soap do?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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