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.
Which coin held more water droplets?
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.
Why water can hold more drops on the coin?
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
. … That’s why you can make a bigger “pile” of water than of oil or syrup.
Does size of a coin affect the amount of water?
H
0
:
The number of water drops a penny can hold is not influenced by “side of penny
“. H
A
: The number of water drops a penny can hold is influenced by “side of penny”.
How many droplets of water can a penny hold?
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.
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.
Which side of a penny holds more water?
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).
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 did the coin did not float in the water?
The
pennies have more density than the water
, and so the pennies sink. Anything with more density than water will sink in water, but other objects that have less density than water will float.
Why does dish soap break surface tension?
Soap molecules are composed of long chains of carbon and hydrogen atoms. … This separates the water molecules from each other. Since
the surface tension forces become smaller as the distance between water molecules increases
, the intervening soap molecules decrease the surface tension.
What did you observe when dropping water onto the coin?
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.
How can you increase the surface tension of water?
Compounds that lower water’s surface tension are called surfactants, which work by separating the water molecules from one another.
Adding salt to water
does increase the surface tension of water, although not by any significant amount. …
What is it called when water sticks to itself?
Detailed Description.
Cohesion
: Hydrogen Bonds Make Water Sticky. Water has an amazing ability to adhere (stick) to itself and to other substances. The property of cohesion describes the ability of water molecules to be attracted to other water molecules, which allows water to be a “sticky” liquid.
What was the control in the penny experiment?
The independent variable in the experiment is the soap and the dependent variable in the experiment is the number of water drops on the surface of the penny. The control is
the penny without soap
.
Why does a paperclip float on water?
It seems to defy the laws of physics, but a paper clip made of steel can indeed float on the water surface.
The high surface tension helps
the paper clip – with much higher density – float on the water. The cohesive forces between liquid molecules are responsible for the phenomenon known as surface tension.
Why can more drops of water fit on a penny than alcohol?
But alcohol has a different size and shape and has its polar part on one end. 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.
