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In this video we will show you an example of cohesion. Cohesion is the measure of how well molecules stick to each other or group together. In this video we will show you how water molecules stick together.

For our experiment, we will be filling a beaker full of water to the very top, but making sure it doesn’t overflow.

From here, we will take a pipet to slowly add more small drops of water to the beaker.

You may not be able to see, but there is actually a arc or dome-like surface on the water.

This is because even though the water looks as if it should overflow, the molecules are actually attaching or sticking together to not allow that to happen. This is a perfect representation of cohesion in the real world and accurately shows how it can be related to the water cycle and chemistry in all.

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1. https://water.usgs.gov/edu/surface-tension.html

2. https://water.usgs.gov/edu/surface-tension.htmlhttps://socratic.org/questions/why-is-surface-tension-important-to-life-on-earth

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How would you define this property?

Tension on the surface of a liquid that acts like a thin flexible film.

How is this property used in the real world?

Surface tension comes from cohesion because the stronger the bond is between the water molecules, the harder it is for the object to move. An example of this is a submarine under water because since the water molecules are coming together, it is harder for the submarine to travel than a boat above water.

What is the human and/or global impact of this property?

The global impact is temperature because when at an ambient temperature, there is a high surface tension. This is because of the particle are moving in a very calm motion where they are still grouped together as if it was cold but are still moving a higher rate as if it was hot.

What is the relationship of this property to chemistry?

Since chemistry deals with how substances interact and combine, surface tension has the same idea because when 2 of the same substances combine(cohesion) there is surface tension that is created. For example boats floating on water in which the surface tension is so high that it can hold the boat above water.

How does this property relate to the water cycle?

These two relate because when precipitation, runoff, or infiltration happens, the water is being put back into the larger body of water that it was produced from and there both of their molecules combine. After they combine, there is a lot of surface tension that is created because since there are other molecules that water isn’t attracted to, they attract to the other water molecules creating a stronger bond and higher surface tension.

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1. https://www.khanacademy.org/science/biology/water-acids-and-bases/cohesion-and-adhesion/a/cohesion-and-adhesion-in-water

2. https://www.enotes.com/homework-help/what-properties-cohesion-adhesion-why-they-764682

3. https://www.thoughtco.com/definition-of-cohesion-604933

4. https://www.thoughtco.com/what-is-chemistry-602019

https://ssec.si.edu/stemvisions-blog/what-are-clouds

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How would you define this property?

All the same elements or molecules are combined together and united.

How is this property used in the real world?

When filling a glass of water to the very top you can always add a few more drops slowly. Before it overflows, the water forms a dome-like shape. This is because of cohesion. Cohesion refers to molecules of the same kind attracting to each other and the dome-like shape forms due to the water molecules sticking to one another.

What is the human and/or global impact of this property?

Cohesion is the reason ships and other things can float on the surface of water because the water molecules are sticking to other water molecules. Cohesion causes surface tension to occur which gives the water a sort-of glaze over the top, where things will be able to float easier. Because of this, if we have a cohesive liquid, something will most likely float. On the other hand, if we have an adhesive liquid, the object will most likely sink because the water isn’t attaching itself to other water.

What is the relationship of this property to chemistry?

Chemistry is the scientific study of matter, its properties, and interactions with other matter and with energy. Cohesion is the measure of how well molecules stick to each other or group together. The property of cohesion relates to chemistry because water can be in the form of all three types of matter. Also, how well molecules stick to each other is basically right in the definition of chemistry because is is the study of matter interaction with other matter. In cohesion matter/water is interacting with other matter/water.

How does this property relate to the water cycle?

Clouds contain water in the liquid or ice form. In the water cycle, you have water from water bodies that is evaporating up into the atmosphere to create clouds. Inside the clouds you have lots of smaller molecules of water once they have evaporated. Due to cohesion these smaller water molecules will attract toward each other and combine together to make larger water molecules. Now that the molecules are larger, they are heavy enough to fall back down to the surface of the earth. This is called precipitation. This shows that cohesion causes the condensation in the clouds and allows precipitation to be possible.

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