Worked solutions to student book questions Chapter 4 Analysing acids and bases Q1. Antacid tablets should normally be chewed before they are swallowed. Why? A1. Antacid tablets are normally chewed to provide a larger surface area for faster reaction with stomach acids. Q2. A laboratory test to determine how much hydrochloric acid is neutralised by a brand of antacid does not give a complete picture of its effectiveness in the stomach. What other factors might be important? A2. Other factors to
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experiment * Iodine solution and some powders are hazardous. * Wash hands when you have finished. Materials * Eye protection * Well plate * 6 small toothpicks for stirring each powder * 6 white powders: icing sugar‚ cornstarch‚ Aspirin powder‚ baking soda‚ baking powder‚ and the mystery powder * Scoopula * Test solutions in dropper bottles: water‚ universal indicator‚ vinegar‚ and iodine solution
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reduced glutathione‚ and hematin)‚ activation time (enzyme and cofactors)‚ reaction time‚ and pH. Moreover‚ the kinetic parameters‚ Km and Kcat.‚ of both enzymes were estimated. Five COX inhibitors were used to validate the assay‚ indomethacin‚ aspirin‚ naproxen‚ ibuprofen‚ and the arylsulfonamide NS-398‚ all with different COX selectivity and time dependency. Time-dependent inhibition was determined by comparing the inhibition‚ with and without preincubation of enzyme and inhibitor. Two flavonoids
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the chemical components of Excedrin and Tylenol‚ two common‚ over-the-counter analgesic drugs‚ were determined by utilizing the technique of thin-layer chromatography‚ or TLC. The active ingredients of Excedrin were caffeine‚ acetaminophen‚ and aspirin with Rf values of 0.11‚ 0.38‚ and 0.61‚ respectively. The lone active ingredient of Tylenol was acetaminophen with an Rf value of 0.39. The elution sequence obtained in the experiment is as follows: ibuprofen (least polar)‚ acetylsalicylic acid‚ acetaminophen
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Melting point 1. What two effects do impurities have on the melting point of an organic compound? Soluble impurities affect the melting point of a solid in the following manner. a. The presence of an impurity in the molten compound reduces its vapor pressure thus lowering the melting point of the compound. b. Broaden the melting point range. 2. For what tow purpose are melting points routinely used a. To determine the identity of an organic solid. b. To determine the purity of an organic solid
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Prozac was the first SSRI drug to hit the market in the U.S in 1988 and by 2005‚ SSRI drugs were the most prescribed. About a dozen of SSRIs are prescribed‚ such as Paxil‚ Zoloft and Prozac. SSRIs are supposed to have fewer side effects than older antidepressants since SSRIs only increase the serotonin levels in the brain. SSRIs have many common side effects‚ including sexual side effects‚ such as a repressed libido‚ erectile dysfunction and difficult achieving orgasm‚ for men and women‚ fatigue
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Chromatography – Analyzing Analgesics by TLC and Isolation of β-Carotene by Column Chromatography Introduction/Background: Flavonoids are an important group of additives that can be defined as pure substances either natural‚ extracted from raw materials or synthetic. Chromatography is the separation of two or more compounds or ions caused by their molecular interactions with two phases – one moving and one stationary (Weldegirma 2012). Three types of chromatography are used
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Chapter 3 1. 1 atom of X = atomic mass (amu) 1 mole f X=atomic mass in grams 1 mole of something = 6.022 x 1023 units of that substance 1 mole of a compound =66.022 x 1023 atoms 6.022 x 1023 amu =1 g 2. What is the mass of 6 atoms of Fe? Answer: 6 atoms of Fe x 55.85 amu÷atom of Fe x 1 g of Fe÷6.022 x 1023 amu = 3. How many atoms does it take to make 1 g of Gold (Au)? Answer: 197.0 g Au =1 mole of Au
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expect by going into the procedure blind. Avoid Taking Certain Medications Do you currently take a blood thinner for an existing condition or take aspirin to manage ongoing pain? If so‚ you will want to speak to your dentist about the effects these medications can have on your root canal procedure. There is an unintended side effect of taking aspirin or blood thinners before oral surgery‚ since they can lead to increased bleeding. Any medication that acts as a blood thinner will actually prevent
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Title: Thin-Layer Chromatography Objectives: Part1: 1. To learn the technique of TLC and the visualization of colourless components. 2. To identify an unknown drug by a TLC comparison with standard compounds. Part 2: To learn the separation technique by using Thin Layer Chromatography plate in separating a mixture of compounds into individual pure compound by using Spinach Leaf. Introduction: (i) General Concepts Chromatography is a common and powerful method used to separate and analyze complex
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