UTF-8Hydrophobic EffectExploring why two liquids do or do not mix
Here are two different liquids that appear 'layered' and do not mix or dissolve in each other. Aqueous and organic liquids will layer as you have probably seen before, but there are many examples in of liquids in nature that behave this way and it is not necessary that one is water and ther is 'organic'. We call liquids that won't mix mutually immiscible. The simulation below has a pink liquid (particles of type "Nt") and a green liquid (particles of type "Pl"). The simulation is carried out with gravity turned on.
Type your name here: David Campbell
Please answer the following questions/challenges by typing directly into this page. To do so, click on the 'Save' button near the top-left of this page, then click on 'Edit' to type directly in the page. Finally, save the changes you've made and submit your work by clicking on 'Webspace' above and 'Submit current page' (you will have to log in to Mol. Workbench).
Questions/challenges:
1.) If you play the simulation, the two particles will not mix. Can you 'break' the model and cause the model to stop behaving this way? List all the changes you made below and how each change destroyed the layering behavior.
I made only three changes to the model. The first was the change in temperature. After viewing this and changing the kinetic energy I then changed the weight of the molecules on the top. These two only gave me the mix of globs and no even mixing clearly. But to have them completely mix hanging the charges helped mix them completely.
2.) Can you make specific changes that cause the layers to flip (i.e. the pink partilces to arrange below the green)? List all the changes you made that succeeded in inverting the layers.
I used the change in weight. I made the green lighter than the red and also made the potential energy
3.) Can you make another change so that the two liquids mix and form a solution. Explain what you did below to achieve that.
The only other change which was also stated in 1 was the charge change. When these molecules had a charge of -0.1 for red and +0.1 for green this gave an even mix. The molecules did require some heat but they mixed completely without th globs.
After you've answered the questions on your own, discuss them with your group to determine what changes they made to accomplish the desired behavior. What's the best strategy? Report your group's consensus on this Google Doc: http://tinyurl.com/l3vqo8j
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