Properties of Water By Adrian Roman & Mckenzie Gouldburg

When we put water droplets on the penny a dome shape started to form with the water. How does that work?

Because of Cohesion, the water molecules stick to each allowing a dome like structure to form on top of the penny. Cohesion helps create surface tension because of how stuck to each other the molecules are.
When we added the soap to the penny and started to put droplets on it, we were only able to put a few drops before the water fell off the penny. Why did that happen?
When the soap is layered on top of the penny it reduces the cohesion of the water molecules which in turn weakens the surface tension, which is what allows us to make the dome shape on the penny.

In a different experiment, we put salt into a beaker of salt but after stirring it around the salt disappeared. We then tried the same thing with cooking oil, but as much as we stirred the oil wouldn't disappear like the salt. Why does this happen?

Like this diagram says water has a positive and negative side, kind of like a magnet. The positive end of the water molecule attracts the negative part of the salt molecule. The is the Polarity property of water. The salt didn't just vanish, it dissolved into the water because of the interaction between the two different molecules, making salt a polar substance.
This is what you might have seen when you put the cooking oil in the water. But this time the oil didn't dissolve into the water because the oil wasn't attracted by the polarity of the water molecules like the salt was. This just proves the oil is a non-polar substance.

In our final experiment, we put a few water droplets on wax paper, unlike other paper the water droplets were able to roll around the paper and they didn't soak through the paper. Why did this happen?

The property of water that explains your phenomenon is adhesion. The adhesion property of water is the ability for water to stick to other things, by making hydrogen bonds. The reason why the water droplets soak through the paper was because the adhesion between the two substances was not strong, so the water droplets were able to roll around freely on the paper.
In the end all of these properties are important to living things because cohesion allows water to stick together and that forms a stable environment for all aquatic life. Adhesion allows many living organisms to get the water they need, especially in plants. The molecules of water stick to the xylem of the plant in order for water to travel up through the plant and reach all of the leaves.
In the end all of these properties are important to living things because cohesion allows water to stick together and that forms a stable environment for all aquatic life. Adhesion allows many living organisms to get the water they need, especially in plants. The molecules of water stick to the xylem of the plant in order for water to travel up through the plant and reach all of the leaves.

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