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Identify the charged groups in the peptide shown below at pH=1 and at pH=7. What is the net charge of this peptide at these two pH values? val-met-ser-Ile-phe-arg-cys-tyr-leu
How much salicylic acid is required to produce 1.1 x 102 kg of aspirin assuming that all of the salicylic acid is converted to aspirin
what is the enthapy change needed to heat 1 kg of water at 0.4 MPa and 4°C to steam at 150°C and 0.4 MPa? b/ Does a state change from saturated vapor at 230°C to the state 100°C and 0.05 MPa represent an enthalpy increase or decrease?
the manufacture of perfumes, contains 3.758 g of carbon, 0.316 g of hydrogen, and 1.251 g of oxygen. What is the empirical formula of this substance?
You will need two series of standard solutions to calibrate your ion-selective electrodes - one series for sodium and one for calcium.
Do the following planes all belong to the same zone: (-1 1 0), (-3 1 1), (-1 -3 2)? If so, what is the zone axis?
Calculate the standard cell potential given the following standard reduction potentials: Al 3+ +3e ? ?Al;E ? =?1.66 V Fe 2+ +2e ? ?Fe;E ? =?0.440 V
What is the molar solubility of lead(II) chloride in a solution that also contains 0.15 M Cl- ions at 25 °C? The Ksp of PbCl2 is 1.6 × 10-5.
what is the global pH change incurred after injection of the HCl? What would the pH change be if this same amount of 1.000 M HCl were put into a gallon of pure water?
A 275 mL sample of vapor in equilibrium with 1-propylamine at 25.0C is removed and dissolved in 0.500L of H2O.For 1-propylamine, pKb= 3.43 and the vapor pressure = 316 torr.
Chemists often use molarity ,M in Moles/liter , to measure the concentration of solutions. Molarity is a common unit of concentration because the volume of a liquid is very easy to measure
How many grams of NaOH and H2O are required to prepare 100 g of a 28.7% NaOH by weight solution?
Propose a step-by-step microscale extraction procedure that could be used to separate a mixture nitrobenzene, 4-methoxybenzoic acid, and benzylamine into the pure compounds using extraction technique.
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