Here’s what you’ll need:
1. 2 small drinking glasses, or 2 small glass bowls
2. 2 teaspoons butter
3. ½ teaspoon dish detergent
4. Water from a kitchen sink
Here’s what to do:
1. Measure one teaspoon of butter into each glass.
2. Smear the butter all around the walls of the glass with your fingers.
4. Measure ½ teaspoon of dish detergent into the other glass, then fill it with cool water up to the rim also.
6. After 20 minutes, pour out the water from each glass, and rinse both glasses gently with cool water.
What do the glasses look like after you rinse them? Do they still have butter in them? Do they look the same, or different? Try to sketch in your notebook what the glasses look like, and make notes about the differences between them. Be sure to write down what you did!
Try this experiment again, but use several different dish detergents to see which one works best!
· Be sure to have an identical glass for each different detergent
· Be sure to use the same amount of butter in each glass
· Be sure to use the same amount of detergent and water in each glass
· If you have a scale, record the weight of each glass and butter before and after soaking in water or water and detergent. Then you can compare detergents by determining how much weight (butter) the glasses lost after rinsing. LET THEM DRY BEFORE YOU WEIGH THEM THE SECOND TIME!
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