2001 Question 16 (3 marks) Radioisotopes are used in industry‚ medicine and chemical analysis. For ONE of these fields‚ relate the use of a named radioisotope to its properties. Medicine – Iodine Ingested iodine concentrates in the thyroid gland and so iodine 131 can treat thyroid disorders (e.g. tumours) Iodine 131 has a half life of just over 8 days‚ emits beta particles and gamma rays as it decays. This half life is long enough for it to be transported form where it is produced to where it needs
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INVESTIGATING THE EFFECT OF TEMPERATURE ON THE RATE OF ENZYME ACTIVITY. To investigate the effect that temperature has on enzyme activity I am going to use the enzyme amylase‚ which is used as a biological catalyst to break down starch‚ which cannot pass through the gut wall due to the size of the molecules‚ into smaller ones. Amylase is a carbohydrase‚ which converts starch to simple sugars in the Salivary Glands. Three features of all enzymes are: They are always proteins. They are specific
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| Dry | Dry | 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
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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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GAS LAWS GROUP 1 Sheena Mae Agustin Hans Alcantara Renzo Bren Ado Miguel Afable Ron J Advincula De La Salle University - Dasmariñas Dasmariñas‚ Cavite Philippines ABSTRACT Gases behave in a similar way over a wide variety of conditions because to a good approximationthey all have molecules which are widely spaced‚ and nowadays the equation of state for an ideal gas isderived from kinetic theory. The combined gas law or general gas equation is formed by the combination of
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test strip and dipped it into the water in the cup to test for glucose. Then we took the cell out of the water‚ weighed it‚ and recorded it in the chart. We took the cup with the starch cell and tested it for starch by using lugols iodine. We put 4 drops of the iodine into the cup. We took the starch cell and weighed it‚ then recorded
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of Antiseptics and Disinfectants Purpose: The purpose of this lab is to discover substances that can slow the growth of‚ or kill‚ microorganisms. Hypothesis: The antiseptic that will prevent the growth of bacteria the most is iodine. The disinfectant that will prevent the growth of bacteria the most is bleach. Procedure: To begin the lab‚ turn the agar plate over and divide the plate into four quadrants and label the agar plate whether you used the
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Enzymes are globular proteins that are synthesized by the ribosomes in a cell. They act as catalysts during biological reactions; therefore‚ enzymes are able to speed up these reactions without undergoing a permanent change themselves. These proteins are able to do this by lowering the activation energy of a reaction. To add on‚ enzymes require specific conditions under which they can work best. Reactions occur at faster rates when the temperature is higher. However‚ the rate of an enzyme-catalyzed
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this experiment was to determine the reaction order of the oxidation of iodine with respect to persulphate (part 1) and iodine (part 2). For part 1 of the experiment‚ this was done by titrating a solution of 50 cm3 of diluted 0.0225M persulphate and 250 cm3 of 0.4M potassium iodine against a 50 cm3 solution of 0.01 M solidum thiosulphate‚ using 3 ml of 2% starch as an indicator. For part 2‚ a solution of 25cm3 of iodine and persulphate‚ and 25 cm3 of 0.04M potassium chloride was titrated against
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oil‚ glucose solution‚ sucrose solution‚ starch solution and distilled water were added separately into six marked test tubes. The volume added was about one finger thick in depth of a test tube. 2. 5 drops of Iodine solution was added to each test tube. 3. The sample’s reaction with iodine was recorded. 4. The samples connected by another group with 5 drops of Benedict’s solution added were heated all together in hot water bath. 5. The test tubes containing samples were taken out of the hot water
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