and attention will be paid to the correct use of the significant figures. The experiment approach that will be used will tell the mass and volume of the metal and liquid determined by measuring these two quantities with a graduated cylinder and biuret. Procedure: a) The density of metals First I obtained a quantity of unknown metal. Recording the unknown number. I used only one type of metal for this part of the experiment. The unknown metal that I was instructed to use was a chunk‚
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Date 11/10/14 Partner if applicable Part I: Observations of formation of casein precipitate The milk began to curd. As the curd increases the milk appeared more clear at times. Mass of casein 1.65 g Part II: Test tube Observation of CuSO4 biuret Test Test Results (+ or -) Casein Solution turned violet + Egg white solution turned violet + Water solution turned blue - Sugar solution turned blue - Postlab Questions 1. Whas is the theoretical yield of casein based on the table of Milk Composition
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Biological Molecules Experiment-Specific Questions Experiment 1: Monosaccharide Test 1. Fill in the table below with the results from the monosaccharide test experiment‚ and your conclusions based on those results. Results Monosaccharide Test Solution Initial Color Color with Benedict’s Solution Color After Heating Monosaccharide? glucose solution clear blue orange yes water clear blue blue no sucrose solution clear blue
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followed without any variations in materials and methods. The number for the unknown solution is‚ #128. Results The Results of Each Solution When Mixed with Each Type of Tests Test Tube Samples | Benedict Before After | Biuret | Iodine | #1. 1% glucose solution | light blue | red/brown | light blue | pale yellow | #2. 0.3% glucose - 1- phosphate | light blue | no colour change | light blue | pale yellow | #3. 1% maltose solution | light blue | red/brown | light blue
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These biological macromolecules are to be identified by the changes in colour through three different tests - Iodine Test for starch and glycogen‚ Benedict ’s Test for reducing sugars‚ and Biuret Test for Proteins. However‚ only two macromolecules are being identified in this experiment - carbohydrates and proteins. There are 12 solutions to be tested in this experiment. The Iodine test is used to indentify starch and glycogen in the given
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Danny Fish 10/9/11 Chemical Testing To identify An Unknown The hypothesis tested was that depending on the solution presented‚ which would test positive for one of the following‚ proteins‚ carbohydrates‚ or lipids through use of chemical testing. (Sudan IV‚ Benedicts’ Solution‚ Iodine‚ Biuret’s) . In order to gain more information for the hypothesis‚ one must know how to test for said macromolecule. Each of the above stated molecules has their own individual solution that will in turn identify
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Diffusion and Osmosis Experiment Methods/Materials: 7.1 Experiment: Rate of Diffusion of Solutes In the initial set up of this experiment I had 2 sets of 3 screw-cap test tubes that had each been half-filled with 5% gelatin and 1-mL of the correct dye (either potassium dichromate‚ aniline blue‚ or Janus green) in each of the test tubes. I labeled the 3 test tubes of set 1 with which die they contained and marked them “5 ˚C”. Then with the other set I did the same exact thing‚ except I labeled
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Proteins Biuret Test Results. Figure 1 is showing both graphs of results from the spectrophotometer. Figure 1A is the results without the unknown plotted. By using the best fit line and equation the unknown substance was found to have .75 absorbance and 11.5 mg/mL
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3/5/2011 EXPERIMENT EXPERIMENT 8 OBJECTIVES CONCEPTS REAGENTS PROCEDURE RESULTS DISCUSSION IR ANALYSIS 8 Objectives to differentiate various types of oxygen-bearing organic compounds to device a scheme to distinguish each functional group Analysis of Oxygen-bearing Organic Compounds alanx3@yahoo.com OBJECTIVES CONCEPTS REAGENTS PROCEDURE RESULTS DISCUSSION IR ANALYSIS to characterize an unknown sample through parallel chemical tests ARMSALCEDO ARMSALCEDO alanx3@yahoo
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test (Differentiates primary‚ secondary‚ and tertiary alcohols) Reagent: ZnCl2 in conc. HCl Observation: Rate of reaction (tertiary alcohol> secondary alcohol> primary alcohol) Procedure: 2mL Lucas Reagent in test tube+ 3-4 drops of alcohol‚ stopper‚ shake vigorously‚ NOTE time required (less than 10m mins only) to form an emulsion or separate layers. Oxidation (Confirms if alcohol is oxidizable: presence of H in C-OH bond) Reagent: Neutral KMnO4 Observation: purple color ( brown ppt Procedure:
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