AP LAB 1: Diffusion and Osmosis Exercise 1A: Title: Diffusion Objectives: * To understand the mechanism of diffusion and its significance in cells. * To understand how solute size and concentration gradients effect diffusion across a selectively permeable membrane. * To understand how a selectively permeable membrane between two solutions effects diffusion between them. Hypothesis: If I observe that a Benedict's test has came back positive for glucose in the beaker when it came back negative initially, the color of the bag has been tinted from initially being clear, and the mass of the bag has increased; then I will conclude that the dialysis tubing is permeable to glucose, iodine potassium-iodide, and water but not starch, and diffusion has occurred. Procedure: 1.
When a sport drink is needed h. An individual will burn 200-500 calories during a standard workout that is 30 minutes long. However, Gatorade has about 150 calories in it so a more strenuous workout is needed for Gatorade to be beneficial i. For training over an hour at medium to high intensity, look for a drink that provides between 13-19 grams of carbohydrate per 8 oz serving, and at least 80-110 mg sodium 4. Water is insufficient j. Thirst mechanism in the brain is stimulated by the osmotic effects of electrolytes in body fluids and effective sports drinks will also contain the correct electrolyte to maintain the osmotic drive for
The R tube will then be put in a large beaker. Another large test tube, boiling tube will be needed, along with a Pasteur pipet. A regular sized test tube will be labeled “C” for “colored solution,” and the new boiling tube will be labeled “P” for “product”. One boiling chip will then be placed into the P tube. 5mL of acidified water will be measured, using a graduated cylinder, and will be transferred to the R tube, and will be immediately vigrously mixed with the reactants.
The reason why most athletes choose Gatorade over water is because the ingredients in Gatorade refuel the body quicker than water. Athletes need to be able to get replenished instantly and they know that Gatorade will do it the best. If an athlete only has a few moments to take a breather, he can get a quick drink of Gatorade and go back to his activity much more energized than he was before. The Gatorade company tries its best to keep the consumer hydrated. "Gatorade focus has always been fluid replacement" (Theodore).
Use a new glucose strip and record Data: Conclusion: According to my data, pH levels do, in fact, affect the results of Lactex. I say this because in my experiment, pre-enzyme, my solutions were all negative except for the soda. I used the test strips to determine if they were negative or positive solutions. After I put in the enzyme, Lactex, my results changed. Vinegar, Antacid, and Soap all became positive solutions after I put in the enzyme.
First I made a water bath by filling the 100 mL beaker with cool tap water. I then placed crushed ice in the 100 mL beaker so the water level was just below the top of the beaker. I sprinkled a little salt in the ice water and mixed it well. I then filled the test tube half full with distilled water and set the test tube in the 24 well plate. I inserted the digital thermometer into the test tube and took reading every 30 seconds until the readings remained constant.
Laura Mccain Lab 5: Osmosis with Hypertonic, Isotonic and Hypotonic tonicity Purpose: The purpose of this lab is to familiarize you with osmosis and, specifically, what happens to cells when they are exposed to solutions of differing tonicities. Hypothesis: Hypotonic Solution: the cell has a higher concentration in it than in the area surrounding it. Water moves into the cell to equal out concentration. Isotonic Solution: The cell has a equal proportion of concentration with the area surrounding. Water continually flows in and out to keep concentration even.
When alcohol is consumed it quickly enters the bloodstream and is distributed to all major organs in the body, such as the heart, brain, liver, pancreas, kidney, etc. Unlike caffeine, alcohol is not a stimulant but a depressant. Alcohol consumption can lead to coma and death. (Gervasi, 2010) It is suggested to use Daphnia magna Straus as a biotest object for the evaluation of heart rate (HR) as a functional parameter. (Eksp Klin Farmakol) According to The Scientific Method II (C.Gervasi-2010), as a crustacean, the daphnia is closely related to freshwater and brine shrimp, and more distantly related to a crab and lobster.
Why is this necessary? Obtain an appropriate amount of 5.00 M NaCl and fill your 25 mL buret. Pipet a 20.00 mL aliquot of 0.100 M acetic acid solution into a 100 mL beaker, add a magnetic stirring bar, and then set up the titration apparatus as indicated in Figure 1. Record the initial pH and then begin titrating. You will titrate in 0.25 mL intervals for the first 2 ml and then in 1 mL intervals until a total of 6 mL of 5.00 M NaCl has been delivered.