Sanger's reagent, DNFB, is known to react with phenolic, imidazole, and free amino groups. With this in mind, would it be possible to determine the N and C terminals of a dipeptide composed of tyrosine and lysine?
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Assume 200. mL of 0.400 M HCl is mixed with 200 mL of 0.250 M Ba(OH)2 in a constant-pressure calorimeter. The temperature of the solutions before mixing was 25.10C; after mixng and alowing the reaction to occur, the temperature is 27.78C. Determine ΔrH for this reaction in units of kJ/mol-rxn.
2 HCl(aq) + Ba(OH)2(aq) -> BaCl2(aq) + 2 H2O(l)
The densities of all solutions are 1.00 g/mL
The specific heat capacitites of all solutions are 4.20 J/(gC)
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3) Gold-198 has a half-life of 2.7 days. How much of a 662.5 mg gold-198 sample will remain after 13.5 days?
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Coal powered electricity has only about 30% total efficiency (i.e. from point of combustion to your home) – give a technical explanation of why this is so.
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1) The pressure inside a hydrogen-filled container was 2.10 atm at 21 ∘C. What would the pressure be if the container was heated to 87 ∘C ?
2) At standard temperature and pressure (0 ∘C and 1.00 atm ), 1.00 mol of an ideal gas occupies a volume of 22.4 L. What volume would the same amount of gas occupy at the same pressure and 70 ∘C ?
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The active ingredient in a zinc nutritional supplement is ZnSO4·7H2O (molar mass = 287.58 g/mol). Ten zinc tablets containing a mix of the active ingredient and an inactive filler were ground and mixed together thoroughly. The total mass of these ten tablets was 10.165 g. A 1.830 g sample of the finely ground tablets was dissolved in an acidic solution. The solution was neutralized with ammonia and subsequently warmed in a water bath. Addition of (NH4)3PO4 to the solution resulted in the precipitation of ZnNH4PO4. The precipitate was filtered and dried, then ignited to produce 0.234 g of Zn2P2O7 (molar mass = 304.76 g/mol). What is the mass percent of ZnSO4·7H2O in each tablet?
What is the average mass of the active ingredient ZnSO4·7H2O and inactive filler in each tablet?
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HOI + NO = I2 + NO3-1 balance the following reaction in acid
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Naphthalene is mostly insoluble in water. How would you recrystalize benzoic acid contaminated with naphthalene?
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At 1 atm, how much energy is required to heat 49.0 g of H2O(s) at –10.0 °C to H2O(g) at 119.0 °C?
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Technetium-99 is used as a radioisotope in a variety of medical applications . if a patient receives a dosage of 6.00 mg at 8 am on thursday , then how much would remain at 4pm on friday afternoon? the half life of Tc-99 is 6.0 hours.
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What are the benefits and drawbacks in CZE (Capillary Zone Electrophoresis) with other more conventional separation technique, such as HPLC (High Performance Liquid Chromatography)?
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A buffer solution was prepared by dissolving 4.00 grams of sodium propanate (NaCH3CH2CO2, FM 96.06 g/mol) in a solution containing 0.100 moles of propanoic acid (CH3CH2CO2H) and diluting the mixture to 1.00 L. pKa for propanoic acid is 4.874.
(a) To this solution was added 5.00mL of 1.00 M HCl. Calculate the pH of the resulting solution.
(b) To this solution was added 5.00mL of 1.00 M NaOH. Calculate the pH of the resulting solution.
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can someone please give me name, structure and percebtage of FAME that are likely produces from the vegetable oil? i need 3! and it has to be similar to the fatty acid structure of vegetable oil!
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