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Question- Considering only the R-groups for the amino acids below, which one would NOT contain a nucleophile at a high pH (> 11) a. Lys b. Ser c. Cys d. Trp e. none of the preceding
I need proficient help in the above problems.
Problem- If you need to make a phosphate buffer made with NaH2PO4 and Na2HPO4 that is 0.010M total concentration and has a pH of 7.4, how much of each salt would you need to weigh out in order to make 150mL of total buffer solution
A system absorbs 159 kJ of heat, and performs 83 kJ of work on the surroundings. What is the change in E of the system
A gas is compressed from initial volume of 5.60L to 1.23L by an external pressure of 1.00atm. During the compression the gas releases 128J of hear. What is the internal energy of the gas?
A solution of cough syrup contains 5.00\% active ingredient by volume. If the total volume of the bottle is 34.0mL , how many milliliters of active ingredient are in the bottle? Express your answer with the appropriate units.
What will be the value of E cell and E0 cell when the Cu/Zn battery has "run down" I.e., reached equillibrium? Also will the concentrations of Zn2+ and Cu2+ be large or small when the battery has "run down"? Does this make sense?
Calculate the terminal velocity of particles with a density of 1.3 g/cm3 and a diameter of 250 microns falling through water at 200 C
Three pure compounds are formed when 1.00 g sample of elements X combine with, respectively, 0.472 g, 0.420 g, and 0.236 g of element Z. The first compound has the formula X2Z3.
A potassium bromide solution is 8.34% potassium bromide by mass and its density is 1.03 g/mL. What mass of potassium bromide is contained in 44.8 mL of the solution
determine the final temperature of a gold nugget mass 376g that starts at 398 k and looses 4.85 kj of heat to a
What is the empirical formula of a compound composed of 3.25% hydrogen, 19.36% Carbon, and 77.93% oxygen by mass
A 125 mL sample of dry air at 230 degrees celcius is cooled to 100 degrees celsius at constant pressure. What volume will the dry air occupy at 100 degrees celsius.
What is the typical range of Ka and Kb values for weak acids and bases. Which value represents the weakest and which the largest. What would be the pH of solutions 0.1 M in the acid or base at the extremes of the range.
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