What happens when you drop water on a penny?
The attraction of water molecules to other substances, like soil or glass, is called adhesion. As drops of water are added onto a penny, the adhesive force between the water and the penny keeps the water from falling off. Cohesive forces are strong, but not unbreakable.
How do drops of water on a penny show cohesion?
Procedure
- Fill the medicine dropper with water.
- Now carefully add one drop of water at a time to the top of the penny.
- Keep adding drops (refill your medicine dropper as necessary) one at a time.
- Once the drop spills over the penny’s edge, use a towel to completely dry off the penny and surrounding surface.
How many drops can fit on a penny experiment?
STEP 2: Use an eyedropper or pipette to pick up and carefully drip one drop of water at a time onto the penny. STEP 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 many drops of water can fit on a penny conclusion?
The answer to the purpose of this expirement is that with just regular drops of water pennies can hold an average of 30.25 drops of water.
Can a penny hold more drops of plain water or soapy 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 long does it take for one drop of water to evaporate?
This is an experiment that shows the required time to naturally evaporate one drop of water. It takes at least 3.5 hours to do it, and all of the pictures are recorded in this time lapse video.
Why does the heads side of a penny hold more water?
Water’s cohesion and surface tension are special because of hydrogen bonds. The cohesion and surface tension of water becomes apparent when the drops of water you add to the penny reach the penny’s edge. Once the water has reached the edge, you begin to see a bubble or dome of water forming on top of the penny.
Which side of a penny will hold more drops of water?
heads side
The results indicate that when you drop water on a penny that the heads side of the penny will hold more drops (heads 23 drops, tails 18 drops).
Why can more drops of water fit on a penny than alcohol?
Alcohol molecules can meet at areas where they would not attract as strongly. The water is more attracted to itself than to the metal of the penny. The alcohol is a bit less attracted to itself so it spreads more on the penny.
Why does dish soap break surface tension?
Detergent and Soap Break Surface Tension It is known as hydrophobic, meaning “water fearing.” By attempting to move away from the water molecules, the hydrophobic ends of the detergent molecules push up to the surface. This weakens the hydrogen bonds holding the water molecules together at the surface.
How long does it take for a drop of water to evaporate at room temp?
Now, I assume that this mass flux remains constant with time since the water is in thermal quasi-equilibrium with the room (a large temperature reservoir), and therefore remains at constant temperature, thus not changing the properties of water. The water takes 1.2 hours to fully evaporate.
When you boil water Why does the level of liquid decrease?
when you boil water, you convert it into water vapor, which leaves the pot and mixes with the atmosphere. If you boil the pot long enough, eventually all the water in it is converted to vapor and leaves. the pot is then empty.
Why do so many drops of water fit on a penny?
As drops of water are added to the penny, the adhesive force between the water and the penny keeps the water from falling off. The cohesive forces between polar molecules are stronger than those between non-polar molecules, such as those in oil or syrup. That’s why you can make a bigger “pile” of water than of oil or syrup.
How many drops of water can fit into a penny?
What we’re trying to find is how many drops of water can fit on a penny. Our hypothesis was 8 drops of water can fit on the penny. We thought only 8 drops of water because a penny is small and we didn’t think so much water would would fit on a penny,however; we were wrong.
How can so many drops of water fit on a penny?
In Conclusion, 47 drops of water (15.51 ml) fit on the penny before it spilled over. This is due to the strong cohesion between the water molecules; they clung together and piled up into a little bubble of water until the forces pulling it to overflow were too great.
How many drops of soapy water fit in a penny?
1. Rinse a new penny in tap water. Dry thoroughly with a paper towel. 2. Place the penny on a fresh paper towel. 3. Fill a beaker with 25 mL of tap water. Add 2 drops of liquid dish soap to the beaker and stir. 4. Using a fresh pipet, slowly drop individual droplets of soapy water onto the surface of the penny, as done in Part A.