The water was tested for each initial chemical test because it served as the controlled variable. Since water is pure oxygen and hydrogen unlike Glucose and Starch‚ one variable may be observed. 2. Biuret reagent will turn your skin brownish-purple. Explain why this occurs. Biuret reagent will turn your skin a brownish-purple because Iodine detects protein in a substance by changing the color to a brown or purple shade‚ and since your skin contains protein it will also change color. 3. When
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Name: Nyam Poh Ye Partner’s name: Liew Teck Seng Class: P1 Date of lab class: Thursday‚ 7-2-2013 Program: Foundation In Science Unit code: FHSC 1214 Unit description: Fundamentals of Cell Biology Year and trimester of study: 2013‚ trimester 1 Title of lab report: Practical 2 Investigation of Action of Saliva and 3 M Hydrochloric Acid in Two Carbohydrate Solutions Lecturer’s name: Mr. Paul Davidson Discussion
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We filled 3 test tubes with the solution A‚ the next 3 with solution B‚ and the last 3 with solution C. The first set of three test tubes A B C we drops few biuret reagent into it‚ then we gently shake the test tubes‚ and observed the test tubes for color change. In the next set of 3 test tubes A B C we put a few drops of Benedict solution into it and we gently shake the test tubes back and forth and then we put all 3 of the test tubes into the boiling water and after a couple of minutes‚ we observed
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tubing to glucose‚ starch‚ and iodine. Initially‚ glucose and starch were placed into the bag‚ and iodine outside of the bag in the beaker. We used the iodine test for the presence of starch which proved positive inside of the bag‚ and Benedict’s reagent for glucose which was positive outside of the bag. We therefore concluded that only small molecules like glucose and iodine can permeate through the bag‚ starch is too large. Introduction This lab has several key objectives. First‚ to learn about
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Aim: The objective is to identify specific chemical substances within a cell and to be able to verify the presence or absence of each one in a cell or food substance for future testing. Hypothesis: The identification of each biomolecular chemical substance should be verified successfully‚ as well as determining if it is present or absent in the cell(s). Theoretical Base: A biomolecule is a substance that naturally occurs in living organisms. Biomolecules consist primarily of carbon and hydrogen
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part B. The coagulum was divided into two portions and the Biuret test and heating was performed. B. The filtrate from III.A was used for the other tests. a.> Test for lactose. 5 drops of the filtrate was added with 3 ml Benedicts’ reagent. It was heated in a water bath. The results were noted. b.> Test for calcium ions. 1ml of the filtrate was added with 1 ml of (NH4)2C2O4 solution. c.> Test for phosphate. 3 ml of the filtrate was added with a few drops of 6M HNO3
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iodide inside the breaker‚ as the latter passed from the beaker into the tube‚ the glucose/starch solution’s change of color showed that the potassium iodide was small enough that it able to pass through from the solution and into the bag. After the Benedict test‚ glucose from the bag was also founded small enough that it can exit from the bag and into and solution. In the end‚ glucose and potassium iodide was the only two that is capable to move freely in and out within the bag‚ while starch molecules
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are responsible for what keeps us running and they are vital in even the tiniest forms of life; cells. Cells are the building blocks of everything around us and without cells and these essential components of life there would be no life. The benedicts reagent test was designed to expose the presence of reducing sugars. I stated before that many of the substances I tested changed colors‚ the color being an indication of the amount in each substance. Distilled water‚ diet soda‚ and glucose‚ all resulted
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[1] is a common laboratory method of quantitative chemical analysis that is used to determine the unknown concentration of an identified analyte. Because volume measurements play a key role in titration‚ it is also known as volumetric analysis. A reagent‚ called the titrant or titrator[2] is prepared as a standard solution. A known concentration and volume of titrant reacts with a solution of analyte or titrand[3] to determine concentration. Contents [hide] * 1 History and etymology * 2 Procedure
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ntroduction The purpose of this experiment was to use Iodine‚ Benedict and Biuret to test the reaction of the following 12 samples: 1% glucose‚ 0.3% glucose-1-phosphate‚ 1% maltose‚ honey‚ 1% sucrose‚ 1%lactose‚ 1% glycogen‚ 1% starch‚ protein‚ beer‚ distilled water and an unknown solution (test tube: 300). The iodine test for starch was to test how would starch reacted if we put iodine in it. The color of starch before the test was clear. The color of the iodine was brown. When you added iodine
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