Iodine is a test for starch while Benedict’s solution is a test for reducing sugars. When solution A is tested by benidicts test‚ the clear blue solution changed to a little reddish and brick red precipitate is formed.this result show that solution A is a reducing sugar. When carried out iodine test with solution A‚ the colourless solution remain unchanged . this tell us that starch is absent is solution A. When solution B is tested with Benedicts test‚ the clear blue solution remain unchanged‚ we
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protein‚ starch‚ lipids‚ and sugars by analyzing the content off food and / or other substances by utilizing different testing methods. In the scientific method‚ a chemical test that is sensitive to these groups can be used to identify molecules that are in that class. Testing involves many procedures that are very precise. This lab is broken down into five different sections; we will be using the Biuret Test for amino groups present in proteins. The Iodine Test to identify the presence of starch. The
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food molecules into smaller ones so that the blood can absorb them. Enzymes turn a large starch molecule into thousands of tiny glucose molecules. Enzymes end in ’ase’. There are thousands of enzymes in our body but each enzyme is only specialised to do one thing‚ for example carbohydraise enzymes digest carbohydrates‚ protease enzymes digest protein. Prediction I predict that the amylase will digest the starch the best and the quickest at around room temperature‚ (35 C-45 C). I have come to this
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experiment involves two oxidation-reduction reactions to calculate the oxidizing capacity of a sample of unknown bleach. In order to determine the volume of Na2S2O3 added‚ students will conduct a titration of bleach with thiosulfate with addition of a starch indicator to find the end point of the titration. Moreover‚ the oxidizing capacity of bleach is calculated with the percentage by mass of NaOCl in the unknown bleach sample. The overall chemical reaction throughout the experiment will be balanced
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Overnight mass | 3.12 | 1.84 | Overnight Texture | Hard‚ strong | Squishy‚ pliable | Data and Analysis: Diffusion: Iodine molecules entered the sack‚ while glucose molecules left the sack. When the iodine came in contact with the starch and changed color‚ the Iodine was entering the sack. You can tell the direction of the iodine by looking at the changing colors. The starch molecules remained in the sack because they were too large to pass through‚ so they couldn’t leave the sack. The glucose
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decrease (Fig. 2). After 30 minutes‚ the concentration of iodine that had diffused was 0.048mol/L which contrasts the 0.011 mol/L that diffused at room temperature Fig. 1: The concentration of iodine diffusing across the membrane (mol/L) vs rate of diffusion (molecules/cm2 *min). The concentration was measured at 3 minutes intervals for 30 minutes. The increased for 9 minutes and then began to decrease. Fig. 2: The concentration of iodine (mol/L) diffusing across the membrane at 35.5°C vs the
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How will changing the percentage of sodium chloride concentration affect the rate of reaction of enzyme amylase‚ measured using the absorbance of starch and iodine with a spectrophotometer. Introduction: Amylase is an enzyme that is involved in the human digestive process. Found in both the human pancreas and the human saliva‚ amylase breaks down starch into sugar so that large molecules can be easily digested1. Like all enzymes‚ amylase must be kept in a certain condition in order to function properly
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| Sodium Thioshulphate | Indicator: | Starch – 2/3 drops | | Trail | 1 | 2 | 3 | 4 | | Trails: | 10 | 8.0 | 8.7 | 8.5 | 8.5 | | Burette Readings: | Initial | 0.00cm310.0cm2 | Difference – (final-initial)10.0cm3 | Final | | | Mean titre: | 8.42cm2 | Table for Chlorine Bleach stored at 350C Pipette Solutions: | H2SO4- 10cm2‚ KI- 10cm2‚ De-ionised water-10cm2 | Burette Solutions: | Sodium Thioshulphate | Indicator: | Starch – 2/3 drops | | Trail | 1 | 2 | 3 | 4
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Aims The aims of this investigation are: 1. To find the rate equation of the reaction of hydrogen peroxide and iodide ions. This will be achieved by using an iodine clock method and colorimetric analysis. 2. Draw a graph of rate against concentration for each reactant (Hydrogen peroxide‚ potassium iodide and H+ ions). 3. Finding the order for each reactant 4. Finding the rate-determining step. 5. Proposing a mechanism for the reaction. 6. Using Arrhenius’ equation to find the activation
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Biological Currency The objective of this lab is to figure out whether or not this money is counterfeit. We will attempt to find the information needed to prove that the money is counterfeit or not by looking at it under a microscope and by using iodine drops to compare the money’s result with the results of different items. Counterfeiting money is not a new to any country. It started when paper money was first made. Some countries attempt to counterfeit rivals money to drive their economy downward
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