"Colorimetry iodine" Essays and Research Papers

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    the solution of amylase and starch in various temperatures of water. After a certain amount of time- different amount of time needs to be used in order to have reliable results- iodine is added in a well on spot plates‚ then two drops of the mixture of amylase-starch is added from each temperature used‚ by adding iodine into the plates the mixture will show how much starch was hydrolyzed‚ this is used to calculate the amount of enzymatic activity each mixture had at the different set temperatures

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    blue-blackDried upNo change 6.distilled waterNo change (Clear blue)No change (Clear yellow)Dried upNo change Investigation 1A: Testing for Macromolecules Discussion: By observing the table above‚ we could see that Benedict’s test was for reducing sugars‚ iodine test was for the presence of starch‚ filter paper was for the presence of fatty acids‚ and the Biuret test was for amino groups present in proteins. Benedict’s solution was used to test for the presence of simple sugars‚ such as glucose (monosaccharide)

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    lab for gram stain

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    (4:15 minutes) Procedure: Include the answers to the questions below in your lab report. Lab Questions: This procedure is used to separate what two types of bacteria? This separation is based on differences in what physical trait? What is the iodine used for in this staining technique? Why is it important to heat fix the bacteria prior to the staining procedure? If you had a bacteria sample that you knew to be gram positive but your gram stain results indicated that it was gram negative‚ how

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    and iodide‚ as described above. The reaction produces iodine‚ the change in concentration of which can be measured over a given length of time. However‚ any colour change in this reaction is very gradual‚ and so although it is possible to measure this colour change‚ it is subject to a high degree of inaccuracy. Therefore we also add 2 other chemicals to the reaction – sodium thiosulphate (Na2S2O3) and starch. The S2O32- ion reacts with any iodine produced in the first reaction according to the following

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    Chemicals in Medicines

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    Chemicals in medicines Rakesh Mohan Hallen The words ‘medicine’ and ’drug’ are often used in our country to mean the same substances: any substance‚ manufactured artificially‚ which can help recovery from sickness‚ relieve symptoms or modify a natural process in the body. A medicine is often a mixture of several chemical compounds. Even if it has only one active component compound often other substances are used as fillers or binders to give it bulk. Chemistry‚ the science related to chemical substances

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    bio molecules

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    BIOLOGY LABORATORY Biologically Important Molecules Carbohydrates‚ Proteins‚ Lipids‚ and Nucleic Acids Objectives In this lab you will learn to: 1. Perform tests to detect the presence of carbohydrates‚ lipids‚ proteins‚ and nucleic acids 2. Recognize the importance of a control in a biochemical test 3. Use biochemical tests to identify an unknown compound Introduction Organic molecules are those primarily made up of carbon‚ hydrogen and oxygen. The common organic compounds of living

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    Lab Report

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    repeated using hexane as the solvent instead of water. Part II: Solubility Testing of the Halogen Make baseline observations of what each of the ions and molecules looks like in water and in hexane. First‚ 1mL of the aqueous (water) solution of iodine will be added to a test tube using a dropper in lieu of a graduated cylinder. Appearance of solution will be recorded. Then‚ 1mL of hexane will be added to the test tube mix. Observations of both layers will be recorded. Process repeated for bromine

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    Biological Currency

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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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    PLANNING COURSEWORK- STARCH AND AMYLASE AIM The aim of this coursework is to investigate the effect of temperature change‚ on the rate of hydrolysis of starch catalysed by amylase. PREDICTION I think that as the temperature increases‚ the rate of reaction also increases‚ to a point when it dramatically decreases. On graph 1‚ you will see a sketch of the graph which I expect to be the result of the experiment. SCIENCE REASONING I think my prediction is correct because the rate of

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    polymer (Figure 1).    The long chains of glucose that make amylose form a tight helix.  If we mix an iodine solution  with the amylose‚ the iodine will lodge itself in the interior of the helix.  This causes the solution to turn  a  dark  blue  color.    If  the  enzyme  amylase  is  added  to  the  solution  first‚  it  will  chemically  remove  one  glucose monomer at a time from the ends.  Addition of iodine to this solution does not give a blue color  but  will  be  colorless  (Distinguish  between 

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