4️⃣ HygieneInfectious diseases aremost often by theTransmitted by hands. Regular and thorough hand washing protects!
🧼 Washing hands
Imagine you had fried chicken for lunch.
“Don’t forget the soap!” calls the mother, as Anna goes to the sink with her greasy fingers.
It's true: Water alone, without soap, won't get rid of the oily film on your skin, and your hands won't get clean. But why does soap do this immediately?
💡Find out what happens when you combine grease and soap. Instead of soap, you'll use dish soap in this experiment. Dish soap acts like a strong soap.
Serviceliste
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For the experiment you will need the following items:Listenelement 1A 100ml beaker with a lid, a wooden skewer, oil, 2 pipettes, dish soap, and water. Where do we find the most bacteria? Determine three different surfaces where you want to collect samples. 3 Petri dishes (either your own or store-bought), a pen, money, a telephone, a doorknob, 3 cotton swabs, and distilled water. Camera.
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PreparationHave all materials ready.
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ImplementationListenelement 31. Fill the cup with water. 2. Use the pipette to add a large drop of oil to the water and observe. Tip: You can add several drops until you get a large drop. Don't drop too vigorously, or you'll end up with lots of small drops. Use a wooden skewer to combine small drops into one large one. 3. Use the other pipette to add a drop of dish soap to the oil drop.
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WatchListenelement 4a) Observe the oil drop in the water: Where is it and what does it look like? ___________________________________________________________________________________________________________________________________________________________________________________________________________________________ b) Observe carefully for a few minutes what happens when you drop the dish soap into the water. ______________________________________________________________________________________________________________________________________________________________________________________________________________
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EvaluationEvaluation a) Soap reacts to grease in a similar way to dishwashing liquid. Discuss with your partner why soap is used to clean greasy hands. ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________ b) You can also draw a picture to accompany your ideas, showing the washing of greasy hands through a particularly good magnifying glass. ______________________________________________________________________________________________________________________________________________________________________________________________________________________
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How to continue researchingLearn how to best remove the following things from your hands: glue residue, marker marks, nail polish, grass stains from a fall, or the remains of a child's tattoo. Write down what you find out: ________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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We want your opinion:Today you have a friend visiting. Your mom calls you to dinner. You go to wash your hands together. Your friend says, "I don't need soap; my hands clean with water." Think about it: What do you think? ________________________________________________________________________________________________________________________________________________________________________________________________________________________________ ___________________________________________________________________________________________________________________________________________________________________________________________________________________________________
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Here is the worksheet to print out ⬇️
