How does surface tension affect water on a penny?
When plain water is dropped on a penny, water molecules strongly attract one another and the resulting surface tension is high. This is observed by the bubble-like shape formed by the water as more drops are added to the penny’s surface.
How many drops of water can fit on a penny lab answers?
Were you surprised to discover that a lot more drops of water fit on a penny than you predicted? We had 27 drops of water on ours! Surface tension and cohesion is the reason you can get so many drops of water on a penny. Cohesion is the “stickiness” of like molecules to one another.
How many drops of water can fit on a penny surface tension experiment?
It’s just amazing to watch the drops of water pile up on the penny! We tried this several times, and we were able to get 23-27 drops on the penny each time before the water ran off the side. Then we compared the surface tension of plain water with soapy water.
Which liquid from the penny experiment has the most surface tension?
plain tap water
You should find that plain tap water produces a much larger, stable drop of water on top of the penny than the soapy water does. This is because plain tap water has higher surface tension, so the surface is “stronger” and can hold together a larger drop.
How to measure surface tension with a penny?
Measure Surface Tension with a Penny. Fill the medicine dropper with water. Now carefully add one drop of water at a time to the top of the penny. Hold the medicine dropper just above the top of the penny (not touching it) so Keep adding drops (refill your medicine dropper as necessary) one at a
Why does a penny have so many drops of water?
Surface tension and cohesion is the reason you can get so many drops of water on a penny. Cohesion is the “stickiness” of like molecules to one another. Water molecules love to stick together! Surface tension is the result of all the water molecules sticking together. Once the water has reached the edge of the penny, a dome shape begins to form.
How do you make a penny experiment?
PENNY EXPERIMENT SET UP 1 Add water to both of your bowls, and to one of them add green food coloring. 2 Use an eyedropper or pipette to pick up and carefully drip one drop of water at a time onto the penny. 3 Count how many drops you can fit onto one penny until the water overflows. We were able to get ours up to about 27!
How do you test a hypothesis with a penny?
Test your hypothesis by comparing the number of drops of tap water that can fit on a penny to the number of drops of soapy water that can fit on a penny. Because water drops may vary depending on how well you drop the water, it is best to run many trials and take an average.