Part 1: Timeline Reflection Pinhole Camera (400Bc-1040AD) The first capturing of imagery involved the design of a dark‚ lightless room with one side covered with large delicate sheet. The earliest mention of this device is by the Chinese philosopher Mo-Ti. A pin is used to pierce the sheet and create a small pinhole. On the outside where the hole was made place a lit candle. What happens now is that the light would travel from the candle through the pinhole and reflect an image of the candle on the
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Many advanced high school and college chemistry students perform an experiment known as the "iodine-clock" reaction‚ in which hydrogen peroxide reacts with iodide to form iodine‚ and the iodine subsequently reacts with thiosulfate ion until the thiosulfate has been consumed. At that point‚ the reaction solutions turn blue in the presence of starch. The experiment helps students understand the fundamentals of chemical kinetics --- the speeds at which reactions take place. 1. Activation Energy
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mechanism‚ or both. When predicting the outcome of SN1 and SN2 reactions‚ the nature of the carbon skeleton‚ nature of the solvent‚ and the nature of the leaving group are all taken into account. The experiment called for a two part reaction‚ sodium iodide in acetone (SN2) and silver nitrate in ethanol (SN1). A series of 8 test tubes were each filled with a different substrate to be tested by these two reagents. Approximately 4 drops of each substrate was added along with 2mL of reagent. If a precipitate
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Title: Observation of Macroscopic Chemical Changes‚ Alice Kimbrell‚ Chemistry 101-DS01:74589‚ 5/31/2013. Purpose: In this lab‚ I will observe macroscopic changes that occur when mixing together certain chemicals and household cleaners. The mixing of the chemicals provided with each other and with acid/base indicators demonstrates how matter can change‚ and how chemistry can be seen with the naked eye. By mixing household cleaners with an acid/base indicator I hope to demonstrate how these
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Alkyl Halides Alkyl halides are a class of compounds where a halogen atom or atoms are bound to an sp3 orbital of an alkyl group. CHCl3 (Chloroform: organic solvent) CF2Cl2 (Freon-12: refrigerant CFC) CF3CHClBr (Halothane: anesthetic) Halogen atoms are more electronegative than carbon atoms‚ and so the C-Hal bond is polarized. H H μ C + C-l δ δ H The C-X bond is polarized in such a way that there is partial positive charge on the carbon and partial negative charge on the halogen. Dipole moment
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ferrous iron from hemoglobin reacts with pyridine to produce red feathery crystals of pyridine ferroprotoporphyrin. Another confirmatory test uses the Teichman reagent‚ consisting of a solution of potassium bromide‚ potassium chloride and potassium iodide in glacial acetic acid‚ and is heated to react with hemoglobin. The reaction first converts the hemoglobin to hemin‚ and then the halides react with the hemin to form characteristic brownish-yellow rhomboid crystal BLOOD STAIN CLASSIFICATION AND
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Name: _____ Date: ______ Ionic Reactions List all of the cations used: Cobalt‚ Copper‚ Iron‚ Barium‚ Nickel List all of the anions used: Phosphate‚ Iodide‚ Sulfate‚ Chloride‚ Bicarbonate‚ Carbonate‚ Hydroxide Compare your results with the solubility rules and/or solubility table in your chemistry text. QUESTIONS: A - Do your results agree with your expectations from the solubility rules/table
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(if not‚ note why not). 1. 2Al + 3Cl2 ---> 2AlCl3 comb.; yes rxn 2. NH4Cl + NaC2H3O2 ---> NH4C2H3O2 + NaCl d.r.‚no rxn‚ all soluble 3. 2PbO2 ---> 2PbO + O2 dec.; yes rxn 4. 2AlBr3 + 3Ba(OH)2 ---> 2Al(OH)3 + 3BaBr2 d.r.‚ yes rxn 5. Iron III iodide + 3silver bromide ---> FeBr3 + 3AgI d.r.‚ yes rxn 6. 2LiCl + I2 ---> 2LiI + Cl2 s.r‚ no rxn‚ I not replace Cl 7. 4K + O2 ---> 2K2O comb. 8. MgCO3 ---> MgO + CO2 dec.; yes rxn 9 2AlCl3 + 3MgCO3 ----> Al2(CO3)3 + 3MgCl2 d.r.‚no rxn‚ MgCO3 insol
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company KPN Hindi‚ an Indo-Aryan language (see list of ISO 639-1 codes) Hydrogen Index‚ the ratio hydrogen/carbon used in Van Krevelen diagrams by petroleum geologists for the assessment of kerogen maturity. See also Rock-Eval pyrolysis Hydrogen iodide‚ in chemistry‚ a diatomic molecule The abbreviation HI or H.I. may refer to: Hainan‚ as abbreviated on the pertinent Chinese government site URL Harlem International Film Festival‚ an annual five-day film festival Harper’s Island‚ a CBS television
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laboratory. Give the reason for the following; Iodimetric titrations are usually performed in neutral or mildly alkaline (pH 8) to weakly acid solution. 2. Iodine solutions are prepared by dissolving I2 in a concentrated solution of potassium iodide. 3. Iodimetric determination of vitamin C is performed rapidly after preparing vitamin C solution 9-1 E XPERIMENT 9 IODIMETRIC TITRATION OF VITAMINE C INTRODUCTION Redox Titrations are among the most important types of analyses
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