in tea‚ coffee‚ cocoa‚ OTC medication‚ and cola drinks.It stimulates the brain and the central nervous system‚ so that a person feels less tired and more alert. The purpose of this lab is to determine the amount of caffeine in tea. The major component of tea is cellulose which is a polymer of glucose. Materials Lab coat Goggles Graduated cylinder 1 tea bag (1.615g) 50 mL beaker Ice Gloves Hot plate 500 mL Erlenmeyer flask 30 mL DI water Wash glass Ca2CO3 DCM Funnel Stopper
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Comparing between the simple and fractional distillation‚ the fractional distillations for both n-propanol and acetone provided a better distillation. The data and graphs support the statement since the fractional graphs provided a steeper slope than the simple distillation. The steeper slope represent how fast the mixture are separated throughout the distillations. For example‚ the simple distillation for acetone the slope initially started at about 20 mL at about 65.5℃ and ended at about 30 mL
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The lesson is divided into 3 labs that can be completed in any order. After labs have been completed‚ facilitate a class discussion where students summarize and compare findings and relate how their findings support (or refute) Newton’s Laws of Motion LAB 1: How fast can it go? Put one car at the top of the ramp and let it roll down. Use a stopwatch to record the time the car rolled. Use this information to calculate the acceleration of the car. Measure the distance the car rolled using the
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Bio Lab Report Erica Patterson September 10‚2013 Intro to cellular and molecular Biology Lab Abstract: In the Biology Laboratory Manual by Darrell S. Vodopich and Randy Moore are results to a similar experiment. The studied the hypothesis of carbon dioxide production by yeast fed sugar is not significantly different than the carbon dioxide production by the yeast fed in protein. Their hypothesis is the one that has helped formulate ours. We also will be answering the same to questions “What
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When Chemicals React! Mr. Bell’s honors level chemistry class conducted an experiment during their lab demonstrations‚ this consisted of elements such as phosphorus and calcium chloride in their experiment. This along with another hydrogen based sunstance produced‚ what looked like a pinkish-looking substance inside of their flasks that were at their lab stations. Sophmore Kelly Caudel said‚ “ I actualley enjoy doing the experiments in this class‚ because it gives us a chance to get away from
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(Staudt 80). In this lab‚ solubility in water‚ acidity‚ and odors of carboxylic acids will be observed. Also‚ esters will be produce and odors will be detected from the product. Finally‚ saponification will be learned. PROCEDURE: Carboxylic Acids and Their Salts: Characteristics of acetic acid: 2mL of water and 10 drops of glacial acetic acid was placed into a clean‚ dry test tube. Before
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Therefore‚ we first extract image feature of each face image. We cluster ORL and Yale after obtaining the low dimensional image vectors. In this paper‚ we use principal component analysis (PCA) to extract eigenface feature [35] and obtain eigenspace X firstly. Then‚ eigenvectors in X are arranged in descending order based on their corresponding eigenvalues. Since the vast majority
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this would have caused the rate of absorbance to be too fast‚ making it too difficult to get accurate readings. Any amount below this would not have produced a reaction “at an appreciable rate.” (Dolphin‚ Vleck‚ Colbert and Westgate‚ p. 76) In addition‚ our results show that a rise temperature and pH only increase the rate of reaction to a certain point before the reaction rate begins to decline dramatically. In the case of boiling of the enzyme there was no rate of reaction found whatsoever.
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Name: Nikia Martinez Class: Biology 240L L3-1201 Assignment: Electrocardiography Lab Report Due: April 3rd 2012 Professor: Dr. B. Schoffstall Introduction In a normal human being the heart correctly functions by the blood first entering through the right atrium from the superior and inferior vena cava. This blood flow continues through the right atrioventricular valve into the right ventricle. The right ventricle contracts forcing the pulmonary valve to open leading blood flow through the pulmonary
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the percent yield by dividing the expected yield‚ the amount of product that should be produced based on your stoichiometric calculations‚ by the actual yield‚ the amount of product that is experimentally obtained from a chemical reaction. In this lab‚ I have determined the reaction for mixing two reactants together; I measured out 0.005 moles of each reactant‚ lead (II) nitrate and potassium chromate. I dissolved‚ mixed‚ and made them react to make products; I compared the mass of the two reactants
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