spatial arrangement of these two molecules‚ that was made up of the same type of bonds and atoms‚ could differ from one another by their arrangement of atoms. This early discovery in his life was confirmed about 30 years later and was the start of stereochemistry. The previous mentioned discovery was the reason why Pasteur started researching fermentation in 1854‚ he figured that asymmetry was a sign of life among molecules of plants and animals. The topic of fermentation was very misunderstood
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Hence‚ these elements do not easily gain electrons because of the weak attraction to the nucleus. Moreover‚ as you move down groups 6 and 7‚ reactivity decreases. For example‚ chlorine was the most reactive than bromine and iodine‚ which makes sense because chlorine is placed above bromine on the periodic
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The percent yield of meso-1‚2-dibromo-1‚2-diphenylethane was calculated to be 66.36% and with a melting point of 235.1°C. Therefore‚ it can be concluded that this experiment was successfully conducted as the percent yield obtained is only 33.64% off from the equilibrium point‚ and because the melting point met the literature value. The percent yield for the product was less than 100%‚ indicating that were experimental errors‚ such as an undesirable side reaction‚ or more likely‚ an incomplete reaction
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The reaction produced very low yield of 6.3% due to the nature of the reaction and the speed at which iodine reacts. The purity of E-Stilbene could have been increased by allowing the reaction to perform longer and to use a faster reactant such as Bromine. Introduction: In this experiment a Wittig
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an unmeasured excess of KBrO3 will be added to an acidified solution of the standard potassium bromate till the faint yellow color appears. This excess of bromine can be determined iodometrically with standard thiosulfate solution. The ascorbic acid is oxidize by air so the titration should be performed quickly. + Br2 → + 2Br- + 2H+ The bromine or iodine used in titration is generated by adding an excess amount of KBr or KI to an acidified solution of the sample according to the following reaction:
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Question 1 0 out of 2 points When electricity is passed through molten potassium bromide‚ two simpler substances‚ potassium and bromine‚ are produced. Therefore‚ potassium bromide Selected Answer: has less mass than the resulting potassium and bromine do. Correct Answer: cannot be an element. Question 2 2 out of 2 points Which of the following parts (postulates) of Dalton’s atomic theory has been modified in light of later discoveries? Selected
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EXPERIMENT TWENTY Qualitative Analysis of Anions Analysis of Solutions Containing the Ions Cl-‚ Br-‚ l-‚ SO42-‚ CO32-‚ and NO3- This experiment continues the qualitative analysis begun in Experiment 19. Here we will be analyzing solutions to determine the presence of anions. The same techniques that were used for the cation analysis must be used for the anions. If you have not carried out Experiment 19‚ read the introductory section before starting this experiment. The major difference
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ENVIROMENTAL PROBLEMS. Nowadays one of the biggest problems which all human beings are facing is an environmental problem. Animals are dying and people are worried about forests destruction and ozone depletion. A lot of people come with new ideas to stop environmental pollutions everyday. However‚ none of those ideas have worked out yet and the environment is becoming worse and worse every day. I have some suggestions that I believe would be useful in this situation. The
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Maleic anhydride underwent the Dials-Alder reaction with distilled cyclopentadiene as the dienophile. The reaction was a cycloaddition which produced cis-Norbornene-5‚6-endo-dicarboxylic Anhydride surface. (1) Product one had a mass of 9.351 grams and product two had a mass of 9.572 grams. The theoretical yield was found to be 10.047 grams‚ which makes the percent yield to be 93.07%. Melting Points were found to confirm the purity of the product. Product one had a melting point of 163.7-164
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Through the top of the condenser‚ 14 mL of concentrated sulfuric acid was added drop wise over a period of ten minutes. The addition of the acid created a change in color of the solution to a rustic orange color. The mixture was refluxed for 30 minutes and the solution changed to a faded yellow-orange color. Once reflux was complete‚ a simple distillation was set up‚ with the
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