Kaylee investigated how well different kinds of soap would make oil and water mix. She put 240 ml of water and 5 ml of salad oil in a zipper-lock bag. She shook the bag 30 times in 5 seconds. Then, she observed the number of the oil drops. Next, she repeated the experiment using 240 ml of water, 5 ml of salad oil, and 1 drop of dish-washing soap. She also tested laundry detergent, shampoo, and liquid hand soap. Independant variable: Dependant variable: Constants: Why do you think she used the first bag - the one with just water and salad oil, but no soap? What is this group called in an experiment? David became interested in objects floating in different liquids. He put 500 ml of water in a jar and measured how high a pencil would float in the jar. He repeated the experiment using the same amount of other kinds of liquids: corn oil, motor oil, vinegar, soda, and milk. Independant variable: Dependant variable: Constants:

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Micelles and Biological Membrane

Micelles are the type of lipid molecules that organize themselves in spherical shape in aqueous solutions. The production of the micelle is a reply to the amphipathic behavior of fatty acids. It means that they consist of both hydrophobic regions and hydrophilic regions. In micelles, polar head groups (hydrophilic groups) produce an outer layer associated with water whereas nonpolar tails (hydrophobic groups) are organized in the interior.