Understanding the Science of Handwashing

What is one of the most effective ways to prevent the spread of germs?

• Using hand sanitizer

• Washing hands with soap and water

• Wearing gloves

• Avoiding public places

Why is soap effective at cleaning oily substances?

• It is a strong acid

• It has a pleasant smell

• It contains alcohol

• It has molecules with both hydrophilic and hydrophobic ends

How does soap destroy bacteria and viruses?

• By dehydrating them

• By freezing them

• By dissolving their membranes

• By suffocating them

What is a key difference between soap and alcohol-based hand sanitizers?

• Soap is more expensive

• Hand sanitizers are more effective

• Soap requires water to work

• Hand sanitizers are always better

What is the role of alcohol in hand sanitizers?

• To add fragrance

• To moisturize the skin

• To dissolve oils

• To disrupt cell membranes

What is a potential downside of using hand sanitizers?

• They are too expensive

• They can cause skin irritation

• They may not cover all surfaces of the hands

• They are not portable

What is the first step in proper handwashing?

• Applying soap

• Rinsing with water

• Using hand sanitizer

• Drying hands

What should you do after applying soap to your hands?

• Scrub for at least 20 seconds

• Apply hand sanitizer

• Rinse immediately

• Dry with a towel

Why is it important to scrub all parts of your hands?

• To make them smell nice

• To remove visible dirt

• To dry them faster

• To ensure all germs are dislodged

What is a common misconception about bar soap?

• It is less effective than liquid soap

• It cannot be used for handwashing

• It is more expensive

• Germs live on bar soap