Why do liquids form layers

It is an important metal in industry, but it is also toxic. The oil layer is on top of the water because of the difference in density of the two liquids. The planetary boundary layer PBL is the lowest part of the atmosphere, ranging anywhere between and m above the surface of the ground. Carrying out thin layer chromatography. Chromatography is used to separate mixtures of substances into their components.

All forms of chromatography work on the same principle. They all have a stationary phase a solid, or a liquid supported on a solid and a mobile phase a liquid or a gas. How fast the compounds get carried up the plate depends on two things: How soluble the compound is in the solvent. This will depend on how much attraction there is between the molecules of the compound and those of the solvent. How much the compound sticks to the stationary phase — the silica gel, for example.

The different types of mixtures determine how the liquid will settle which relates back to the density of a liquid. Certain solutions have mixtures that determine the density of the liquid. The concepts that are covered are related to the Alabama Course of Study on page 59 for 24 for fifth grade science. Name of the liquids that are being used the liquids according to what your table thinks the liquids will layer in the jar the liquids according to how it was poured first liquid to last liquid the liquids in which layer that they occur when the experiment is finished Density from botttom to top of the five layers label it B1 — B5 1.

When doing this lesson on liquid layers, I would have never thought that it would turn out like it did. To begin the lesson I only touched on the high points of density. A huge mistake I made, was to begin with, was not labeling the cup with the name of that particular liquid.

Using liquids such as glycerin and cooking oil they looked very similar in color. I was able to see the difference, but many of my students had a hard time distinguishing the difference between the two.

That was a small matter, I was not prepared when my liquids did not settle like they were suppose too. Instead of telling them the way it should have been, I should have went with what was taken place at that particular moment.

My glycerin ended up on the bottom, then the maple syrup, water, cooking oil, and then the alcohol. It was not too much of a mix up, but I did not know how to explain to them why it was not settling in the order that it should have. After I had finished the lesson I realized that my maple syrup had expanded because it went from being cold then to being warm. I felt that I should have discussed with them more on density, matter, volume, and etc.

But because this was a hand on lesson they were to explore on their own. I agree with that, but because they did not have a basic understanding of it when it came to the colloquium they did not want to discuss especially when Dr. Carefully turn it upside down and set it on the table again.

Observe the different liquids. What is happening to each of the liquids? How are they layered once the jar is upside down? Did you know this would happen? Compare the upside-down jar 1 with jar 2 after a couple of minutes. Do you see any differences in layering now?

What happened to each of the liquids? Get all your cut-up objects and your penny ready, then drop the penny into jar 2. What happens to the penny? Next, take the piece of rubber band and drop it into jar 2. With the popsicle stick push the rubber band all the way to the bottom of the jar. Make sure it does not stick to the bottom and can float freely. Then let go. Where does the rubber band settle?

Does it float on top, in the middle or sit on the bottom? Now drop the piece of wax into jar 2. It should be able to float freely. What happens to the wax piece?

Where does it settle compared with the rubber band? Last, take the piece of popsicle stick and drop it into jar 2. Submerge it with a spoon or popsicle stick and wait for it to settle in one of the layers. On top of which layer does the popsicle stick piece float? Look at all four objects that you dropped into jar 2 and compare their locations. Did they all settle in the same or in different liquid layers?

If they are in different layers, why do you think this is the case? Finally, take jar 1, which is still upside down, and shake it really hard. Then put it back on the table this time, right side up. Observe what happens for about five to 10 minutes.

Did any of the layers mix while you shook the jar? How does the layering look after five to 10 minutes? Extra: With three liquids vegetable oil, corn syrup and colored water there are six different combinations for adding the different layers on top of one another. Try all the combinations and change the order of adding the different liquids each time. Will you always end up with the same layering result?

Extra: In this activity you had three layers of different liquids. Can you find other household liquids that might make a fourth or fifth layer?

Some liquids to try are rubbing alcohol or dishwashing soap. Where do you think they will settle in your density column? Extra: You can even make a density tower using the same liquid, such as water. You just have to change its density by adding different amounts of sugar to it. Try three different layers of water—each layer with the same volume of water, but one with one teaspoon of sugar, one with two teaspoons of sugar and one with three teaspoons of sugar.

Add different colors to each liquid to see the layers more clearly. Which layer is on the top and which layer on the bottom?