flask using a volumetric pipette. The volumetric flask was then filled to the mark with distilled water. The flask was covered with Parafilm and inverted to mix. The next part of the experiment was to determine the Vitamin C in a solution of known concentration. Observations of the Vitamin C sample and the amount found on the label was recorded. A tared piece of weighing paper was used to weigh 0.27 g of Vitamin C. The Vitamin C was then transferred to a clean 50 mL volumetric flask. The flask was filled
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soluble in it at low temperatures • impurities are either soluble at all temps or insoluble at all temps (can be filtered off) 2) Dissolve impure solid • weigh out crude solid and record its mass (also take a melting point for reference) • add a boiling chip or boiling stick (otherwise‚ it may "bump" and spill) • use a minimum amount of hot solvent (Add a bit‚ heat/swirl. Not dissolved? Add more!) NOTE: IF YOU USE TOO MUCH SOLVENT‚ YOU WILL GET NO CRYSTALS! 3) ONLY IF NEEDED: Decolorize • most pure compounds
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1. The label CORROSIVE on a chemical container indicates Ans : ( b ) that contact destroys living tissue as well as equipment 2. FLAMMABLE means Ans : ( a ) easily ignited and capable of burning rapidly 3. " Fatal if swallowed " indicates Ans : ( c ) that the substance will cause death if ingested 4. What is the correct way to handle the following situation? Briefly explain. a. Chemical : Acetic asid i. Inhalation exposure Ans : Remove the person from the exposure. Begin rescue
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18.1.4 – 18.1.6 CALCULATIONS INVOLVING ACIDS AND BASES Review of Important formulas pH = ‐ log10[H+] [H+] = 10‐pH pKa = ‐ log10 Ka Ka = 10‐pKa pOH = ‐ log10[OH‐] [OH‐] = 10‐pOH pKb = ‐ log10 Kb Kb = 10‐pKb The ionic product of water = Kw = [H+] x [OH‐] = 1.0 x 10‐14 mol2 dm‐6 at 298 K The expression varies with temperature
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10 December 2014 Youth in Sculpture Marble sculpture resurfaced as one of the primary forms of media in Greek art around the middle of the seventh century B.C.E.. The advent of monumental sculpture was a huge development. “The Marble Statue of a Kouros (Youth)” or “The Metropolitan Kouros” towers with immense strength at six feet four inches. This Greek kouros‚ a term given to free standing sculpture representing the male youth‚ is one of the earliest marble statues of a human figure created in
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Advantages: Sulfamic acid is the fastest de-scaler - It dissociates into hydroxonium ions more readily in aqueous solution than the others‚ therefore giving a greater concentration of atoms that are able to react with the calcium in lime scale. It is safe to use because it does not produce chlorine gas [5]‚ which can be toxic. Sulfamic acid also has a low volatility. Disadvantages: Sulfamic Acid can be an irritant to eyes or skin and is the most expensive of the de-scalers. Q2) How these de-scalers
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Marble Falls in Texas as the name suggests‚ rests on the banks of Lake Marble Falls. Lake Marble falls is one of the lakes that fall into the category of highland lakes.There are many activities to indulge in around the highland lakes area like fishing‚ observing wildlife and boating. It prides itself in the beautiful scenery it has to offer. It is an amazing town known for its infinite opportunities and remarkable growth. Famous for providing a serene environment‚ it is a pleasant and peaceful place
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The topic of my STEM fair project is cookie taste and appearance. “ How does cream butter‚ melted butter‚ margarine‚ and shortening affect the taste and appearance of chocolate chip cookies”. The purpose of this experiment is to see which type of butter substance is best for bakers to use to make the best chocolate chip cookie. The information from this project will help people who love to bake‚ to find the best way to make cookies that their eaters will enjoy the most. All bakers around the
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how Lupe Medrano felt in the story “The Marble Champ” by Gary Soto.Lupe is good at mostly anything except for sports.She has won several spelling bees‚has never missed a day of school (Except for when she got stung by a bee in Kindergarten)‚and she has her own shelf in her room built for all of her awards that she had won.Then on a rainy day‚she wanted to win something to do with sports.Lupe said “I wish I could be good at something‚anything‚ even marbles!”Lupe knew she would have to keep going and
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After reading the commentary on “Dual Federalism” by James Bryce and “The ‘Marble Cake’ Theory of Federalism” by Morton Grodzins. In which it discusses Bryce’s concerns about the national government. Mr. Bryce is a professor of history at Oxford‚ a member of Parliament‚ and a British scholar who visited the United States around the 1880’s. James Bryce gives his compact description of dual federalism and later between the dates of (1907-1913) he makes his appearance by returning back to the United
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