Abstract The bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure and its mechanism. After the addition of bromine to trans-cinnamic acid‚ the product was identified by its melting point and infrared spectrum resulting in erythro-2‚3-Dibromo-3-phenylpropanoic acid after comparing similar properties. Introduction In this lab‚ the bromination of trans-cinnamic acid was completed to determine dibromide’s stereochemical structure‚ and from there determine
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plates. If the positive metal ions in the solutions are less powerful reducing agents‚ then the metal in the plate will be reduced and hence form a deposition of solid metal. e.g. Zn + Pb2+-> Zn2+ + Pb EXPERIMENT 2: Aim: To range the halogens bromine‚ chlorine and iodine‚ with the strongest oxidising agent first. Hypothesis: A strong oxidising agent is a species that easily gains electrons‚ and is hence easily reduced. The ionisation energy of the halogens (Cl2‚ I2‚ Br2) decreases down the group
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potassium bromide 3) barium nitride 4) aluminum oxide 5) sodium iodide 6) strontium fluoride 7) lithium sulfide 8) radium chloride 9) calcium oxide 10) aluminum phosphide 11) potassium sulfide 12) lithium bromide 13) strontium phosphide 14) barium chloride 15) sodium bromide 16) magnesium fluoride 17) sodium oxide 18) strontium sulfide 19) boron nitride 20) aluminum nitride 21) cesium oxide 22) rubidium iodide 23) magnesium oxide 24) calcium bromide 25) lithium iodide 26) berylium bromide 27) potassium
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Metals and Halogens reactions Elements such as fluorine‚ chlorine‚ bromine‚ iodine‚ and astatine belong to Group 7‚ Halogens. At room temperature‚ fluorine is a yellow gas‚ chlorine is a pale green gas‚ bromine is a red liquid‚ and iodine is a purple solid. Astatine is a radioactive element‚ therefore it exists only in small amounts. All the halogens exist in diatomic molecules. They have high ionization energies and are the most electronegative elements. Their electron configuration ns2 np5 make
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For example‚ lead bromide contains positively charged lead ions and negatively charged bromide ions. Electrolysis is the process by which ionic substances are decomposed (broken down) into simpler substances when an electric current is passed through them. For electrolysis to work‚ the ions must be free to move. Ions are free to move when an ionic substance is dissolved in water or when melted. For example‚ if electricity is passed through molten lead bromide‚ the lead bromide is broken down to
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MONTREAL PROTOCOL: The Montreal Protocol on Substances That Deplete the Ozone Layer (a protocol to the Vienna Convention for the Protection of the Ozone Layer) is an international treaty designed to protect theozone layer by phasing out the production of numerous substances believed to be responsible forozone depletion. The treaty was opened for signature on September 16‚ 1987‚ and entered into force on January 1‚ 1989‚ followed by a first meeting in Helsinki‚ May 1989. Since then‚ it has undergone
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TWS Chemistry 1013-231 Organic Chemistry I Name___________________________________ 2011 Exam#2 - Version 2 MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Energy is __________ when bonds are formed and is __________ when bonds are broken; therefore‚ bond dissociation energies are always __________. A) consumed / released / endothermic B) consumed / released / isothermic C) released / consumed / endothermic D) consumed / released / exothermic
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found to determine syn or anti addition of bromines. The melting point was 199-203°C and the NMR J values angle is at 167 which both prove the erythro-2‚3-dibromo-3-phenylpropanoic. Determination of the Stereochemistry of 2‚3-dibromo-3-phenylpropanoic acid. Introduction The purpose of this experiment was to determine the mechanism of the reaction of trans-cinnamic acid with the addition of bromines to 2‚3-dibromo-3-phenylpropanoic acid. An addition of bromine was added to trans-cinnamic acid and it
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halide will dissociate to form a carbocation‚ which will then react with the ethanol to form an ether. Since there is not a strong nucleophile present‚ the cleavage of the carbon-halogen bond is encouraged by the formation and precipitation of silver bromide. The halide ion will combine with a silver ion from the silver nitrate to form a silver halide precipitate‚ which will advise that a reaction has occurred. + AgBr + NO3- Figure 1: The SN1 mechanism of 2-bromo-2-methylpropane and silver nitrate
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LAB REPORT! EXPERIMENT#5‚6! MANPREET KAUR KHAIRA! LAB PARTNER: VIAN RAIES! The purpose of this lab exercise was to perform the bromination of (E)-1‚2-diphenylethene (trans-stilbene) by addition reaction in which bromine was added across the double bond to yield a vicinal dibromide. The next step was to perform a double elimination reaction by product gained to synthesize an alkyne‚ that is‚ 1‚2-diphenylacetylene. The two major techniques used in this lab were TLC analysis and UV-vis spectroscopy
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