Cements Acid-base rxn cements Resin-based cements Phosphoric acid Organometallic chelate Polyalkenoic compound acid Zinc phosphate ZOE Polycarboxylate Glass ionomer compomer Silicate conventional composite Zinc silicophosphate resin-modified Cement | Composition | Setting rxn | Properties | Uses | Adv | Disadv | Zinc phosphate(ZP) | Powder: ZnOLiq: Phosphoric acid | 3Zn + 2H3PO4 Zn3(PO4)2 + H2O-s/f of ZnO dissolved by acid to give insoluble phosphate-set
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nitrate‚ KNO3 nitric acid‚ HNO3 trisodium phosphate‚ Na3PO4 sodium thiocyanate‚ NaSCN sulfuric acid‚ H2SO4 distilled water‚ dH2O B. Apparatus test tubes iron ring 250-mL beaker iron stand bunsen burner C. Others iron nails copper strip sand paper zinc strip pliers 2 III. Procedure A. Reactions of Iron with various Aqueous Solutions In determining the reactions of iron immersed in various aqueous solutions‚ three set-ups were made‚ each consists of four test tubes with iron nails
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2.MATERIALS and METHODS 2.1. Nature of Reactants 2.1.1 We placed 3mL of 3 M HCl into each of 3 seperate test tubes. Next we added mossy zinc to the first test tubes‚ Sn granules to the second and Cu filings to the third and compared the rates of evolution of hydrogen gas in each test tube. 2.1.2. We mixed 3mL of 0.02 M KMnO4 and 2mL of 3 M H2SO4 in a test tube and stirred using a glass rod. Next‚ we divided the solution into two. We added 2mL of 0.03 M Na2C2O4 solution to the first half and
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reaction of the permanganate (MnO4-) ion in different media. Group 2‚ those on Part B‚ were set-ups that were done in order to study the reaction of Fe(SCN)2+ ion with that of elemental zinc. While the last‚ Group 3‚ those on Part C were set-ups that investigated the reaction of Fe4[Fe(CN)6]3 with that of elemental zinc. Group 1‚ test tubes A to C‚ vary greatly from each other. This is probably because they differ in the medium used for the reaction to took place. In test tube A‚ brown precipitate
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PHARMACEUTICAL CHEMISTRY Chapter 5 – Gastrointestinal Agents • Inorganic agents used to treat gastrointestinal disorders includes: 1. Products for altering gastric pH 2. Protectives for intestinal inflammation 3. Adsorbents for intestinal toxins 4. Cathartics of laxatives for constipation ANTACIDS o neutralize excess hydrochloric acid o inactivate the proteolytic enzyme‚ pepsin o alkaline bases Results of Hyperacidity: o Gastritis – inflammation of the gastric mucosa o Peptic ulcer
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of the experiment * Aim: To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent. Equipment: * 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper‚ zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders Steps: A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with
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Copper Hydroxide(s)—Cu(OH)2. For the third reaction‚ 90 drops of H2SO4 from the pipet was introduced to the Copper Hydroxide(s) to create an acid/base neutral reaction to form Copper Sulfate(aq)—CuSO4(aq). Fourthly‚ lab group 6 slowly added granules of Zinc (Zn) to the Copper Sulfate until the reduction method took place and therefore produced metallic copper(s) within the beaker. The excess
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The Capuchin Catacombs of Palermo Sicily’s Catacombs of Capuchin‚ located directly under the Capuchin Convent is the ultimate museum of the macabre. Indeed‚ the Catacombs of the Capuchins are ancient burial catacombs‚ located in Palermo‚ Sicily‚ southern Italy. The bodies of eight thousand souls line the corridors of the catacombs‚ as their disembodied shells are propped up against the walls‚ or resting in open caskets for the entire world to view this gruesome display that is open to the public
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precipitates remain the same as the copper in the beginning. And it is necessary to synthesize the various copper compounds in order to recover metal because the amount of copper might be left due to some errors during the experiments and the unreacted Zinc which still exist with recovered Copper which cause the percent yield increased. Besides‚ during the experiments‚
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For an object pulled or pushed horizontally‚ the normal force - N - is simply the weight: N = m g (2) where m = mass of the object (kg‚ slugs) g = acceleration of gravity (9.81 m/s2‚ 32 ft/s2) Frictional Coefficients for some Common Materials and Materials Combinations Materials and Material Combinations Static Frictional Coefficient - μs Clean and Dry Surfaces Lubricated and Greasy Surfaces Aluminum Aluminum 1.05 - 1.35 0.3 Aluminum- bronze Steel 0.45 Aluminum Mild Steel 0.61 Brake material
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