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Bromination of trans-cinnamic acid 1. Why should you add more Br2 to the reaction mixture if it turns colorless during the course of the reaction? 2. Predict the products likely to be formed via the anti- addition of Br2/acetic acid to trans- cinnamic acid. 3. What is the predicted m.p. of the brominated product(s) you prepare vis this method? 4. Draw Fischer projection formulas for the products likely to be obtained from the bromination of (Z)-2-pentene with Br2/acetic acid. Identify the chiral centers with asterisks and label each center as R or S. 5. How might you use 13C NMR spectroscopy to determine if the brominated product is contaminated with some unreacted starting material (during the bromination of trans-cinnamic acid)?
A lactic acid/lactate ion buffer solution contains 0.31 M HC3H5O3 and 0.90 M C3H5O3- , respectively. The Ka value of lactic acid is 1.4x10^-4 . Calculate the PH of this buffer.
1.00 g of NH4Cl (s) is completely decomposed by heating to 325 °C at 1.00 atm. What volume of gas will be produced? NH4Cl (s)= HCl(g) + NH3(g)
For each reaction, identify the acid-base conjugate pairs. Then rank all reactions in order of increasing tendency for the reaction to go to completion (to the right).
Calculate the energy and the wavelength, in nanometers, of light emitted when an electron in an excited hydrogen atom
The syringe used in this experiment is calibrated to 60 mL. However, there is a 'dead volume' at the needle end of the syringe that is uncalibrated. This volume equals 1.20 mL. Bearing in mind that the syringe is upside down
when 7.00 moles of gas A and 3.00 moles of gas B are combined, the total pressure exerted by the gas mixture is 1.0 atm. What is the partial pressure exerted by gas a in this mixture
When 36.5 mL of 0.585 M H2SO4 is added to 36.5 mL of 1.17 M KOH in a coffee-cup calorimeter at 23.50°C, the temperature rises to 30.17°C. Calculate pH of this reaction.
How many grams (to the nearest 0.01 g) of NH4Cl (Mm = 53.49 g/mol) must be added to 550. mL of 0.906-M solution of NH3 in order to prepare
A 25.0-mL sample of 1.00 M NH3 is titrated with 0.15 M HCl. What is the pH of the solution after 15.00 mL of acid have been added to the ammonia solution? Kb = 1.8 × 10¯5
Calculate the theortical potential of the following cell. indicate if the cell as written is galvanic or electrolytic
Thin layer chromotography it would be caffeine, but why? both have amide functional groups making them very polar, so why is caffeine more polar?
Consider a process carried out on 1.00 mol of a monatomic ideal gas by the following pathway from state A to state B. Pathway
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