to verify that the substance tested was alum. xviii. The various test used to determine that the substance tested was alum were truly necessary for any experiment. The results that I received were very accurate to the actual values which overall means that I can accept the fact that what I have is alum. Even though part 3 was off‚ the other two tests can solidify that I have alum. p. Explain why it is important to use more than one test to verify your substance. xix. It
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Majed Al Dhwaihi Chem 151 Lab Prelab Assignment for week 3 Chemical Separation Procedure: Separating the sample: First place a small amount of the spinach provided in the mortar‚ just enough to cover its bottom; combined with the sand provided to break down the call walls. A 1:1 mixture of hexane and acetone was determined to best solvent for this extraction. Knowing this add one mL of the pure hexane and one mL of the pure acetone to the mortar. Grind the contents until the cell walls
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And 16Mn also has a good cutting properties‚ weldability. wear resistance and fatigue resistance. So‚ is a very appropriate 16Mn steel. A Ball Mill‚ a type of grinder‚ is a cylindrical device used in grinding (or mixing) materials like ores‚ chemicals‚ ceramic raw materials and paints. Ball mills rotate around a horizontal axis‚ partially filled with the material to be ground plus the grinding medium. Different materials are used as media‚ including ceramic balls‚ flint pebbles and stainless steel
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The history of the periodic table reflects over a century of growth in the understanding of chemical properties‚ and culminates with the publication of the first actual periodic table by Dmitri Mendeleev in 1869.[1] While Mendeleev built upon earlier discoveries by such scientists as Antoine-Laurent de Lavoisier and Stanislao Cannizzaro‚ the Russian scientist is generally given sole credit for development of the actualperiodic table itself. The table itself is a visual representation of the periodic
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Effective Treatment for Drug Addiction Introduction “Every year‚ hundreds of thousands of Americans undergo treatment for substance use disorder‚ also called addiction” (Hart & Ksir‚ 2013‚ p. 409). Drug addiction is a complex brain disease because the abuse of drugs leads to changes in the structure and function of the brain. It is a condition characterized by an overwhelming and uncontrollable desire or craving to continue taking a drug to which one has become habituated through repeated consumption
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screening equipment‚ ans be widely used in mining‚ coal‚ metallurgy‚ building materials‚ refractory materials‚ light industry and chemical industry. Its advantages are stable structure‚ low consumption‚ low noise‚ long service life and high efficiency. Linear vibrating screen can also select and classify powder and particle materials‚ widely used in plastics‚ abrasives‚ chemicals‚ pharmaceuticals‚ building materials‚ food‚ carbon‚ fertilizer and other industries. In general linear vibrating screen is
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Scheme of Analysis for Lab 2 Unknown Sample Description Phase‚ color‚ odor‚ crystalline or gel-like? If crystalline‚ what is crystal shape – needle-like or powdery? Does it look like a pure substance or a mixture? How many components appear to be present? Tests on original sample Flame Test Bushy yellow‚ orange flame – Na+ is present and possibly K+ and NH4+. Pink-purple flame – K+ is present and Na+ is not. (Possibly NH4+) No color or faint trace Na+ - NH4+ is possible‚ K+ and Na+ are
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Chemical Reactions I. Purpose – The purpose of this lab was to observe different type of chemical reactions to write and balance chemical equations. II. Hypothesis: If you mix two chemicals together‚ then they will change color and/or bubble/fix. III. Procedure - Workstation 1: 1. Light the Bunsen Burner 2. Add 5 – 8 mL of HCL to a test tube that’s in the test tube rack 3. Drop a 2 – cm piece of Mg ribbon into the test tube 4. Record Observations 5. Clean Workstation
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ab: Observing a Chemical Reaction Name: Deja Eason Period: 5th Period Partners: Melingh Patterson‚ Tori Millens Date Performed: 9/2/11 Teacher: Mrs. Medina Abstract: This experiment was all about observing a chemical reaction. During the experiment‚ we made observations and possible explanations on why Copper(II)Chloride Dehydrate and Aluminum foil created a chemical reaction. The observations were made by using Copper Chloride‚ Aluminum foil‚ and Distilled water. Before the Aluminum
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Investigating Chemical Equilibrium Date: 30th April 2013 Due Date: 15th May 2013 Prepared For: M. Seraji Prepared by: Andrea Odunze Abstract Many reactions proceed to a state of equilibrium. A chemical reaction at equilibrium‚ where the rates of the forward reaction and reverse reaction are equal‚ looks like this: A + B AB There are three factors‚ according to Le Chatelier’s principle‚ that affect the equilibrium position and equilibrium constant. These are the concentrations of products
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