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Introduction
Typing practice
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Text to type: You wash your hands every day. But how does soap actually remove grease and germs? Soap can do something water cannot do on its own: it connects water to oily dirt. Let’s see how.
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Before you begin
Warm-Up Questions
Do you wash your hands with soap? When do you wash them?
Have you ever tried to wash oil off your hands with only water? What happened?
What do you think soap does to dirt or oil on your hands?
Part 1: Why Water Alone Is Not EnoughReading
Part 1: Why Water Alone Is Not Enough
Typing practice
Type the text exactly. Timer starts with your first key.
Text to type: Water is very good at cleaning many things. But water and oil do not mix. When you pour oil into water, the oil floats on top. It does not go into the water. This means if you rub greasy hands with only water, the grease stays on your skin. The water just moves around it. According to the CDC, washing with only water is less effective than washing with soap.
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Check your understanding
Check: Why Water Alone Is Not Enough
1. Why does water alone not remove grease from your hands?
Sample answer
Water and oil do not mix. The grease stays on the skin and the water moves around it.
Part 2: Soap Has Two Special EndsReading
Part 2: Soap Has Two Special Ends
Typing practice
Type the text exactly. Timer starts with your first key.
Text to type: A soap molecule is very small — too small to see. But it has two ends that do different jobs. One end loves water. The other end loves oil and fat. Because of this, soap can connect to both water and oil at the same time. Think of soap as a tiny bridge between two things that do not usually mix. The American Chemical Society explains that this is why soap works where water alone cannot.
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Check your understanding
Check: Two Ends of Soap
1. What are the two ends of a soap molecule, and what does each end do?
Sample answer
One end loves water and one end loves oil. This lets soap connect to both at the same time.
Part 3: How Soap Traps the GreaseReading
Part 3: How Soap Traps the Grease
Typing practice
Type the text exactly. Timer starts with your first key.
Text to type: When you lather soap on your hands, many soap molecules move toward the grease. Their oil-loving ends grab onto the grease. At the same time, their water-loving ends point outward toward the water. The soap molecules form a tiny round group called a micelle. The grease is trapped inside the micelle. According to the American Chemical Society, these micelles let water carry the trapped grease away when you rinse.
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Check: How Soap Traps the Grease
1. What is a micelle, and how does it help remove grease?
Sample answer
A micelle is a tiny round group of soap molecules. The grease is trapped inside it, so water can carry it away.
Reading
Part 4: Why Lathering and Rubbing Matter
Typing practice
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Text to type: Rubbing your hands together with soap is very important. Rubbing helps the soap molecules reach all parts of your hands — between your fingers and under your nails. Lathering also helps lift germs and chemicals off the skin. The CDC says that lather and rubbing help remove germs and chemicals, and that very hot water is not needed. Cool or warm water works well.
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Check: Lathering and Rubbing
1. Why should you rub your hands when you use soap? Do you need very hot water?
Sample answer
Rubbing helps the soap reach all parts of your hands and lifts germs off. You do not need very hot water — warm or cool water works well.
What you can do now
Final Reflection
In your own words, explain why soap removes grease but water alone does not. What is the key reason?
Learning cards
My cards
How Soap Removes Grease
0 due · 10 new · about 3 min
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Listening
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Reading
Part 1: Why Water Alone Is Not Enough
Reading
Part 2: Soap Has Two Special Ends
Reading
Part 3: How Soap Traps the Grease
Reading
Part 4: Why Lathering and Rubbing Matter
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