You have an aqueous solution in a test tube containing  mol/l of the peptide eee. with regard to e, the pka of the main carboxylic acid group is 2.19, the pka of the main amine group is 9.67, and the pka of the side chain group is 4.25. considering a ph of , derive an expression for the net negative charge per liter in the solution due to the peptide. as a separate question, do you expect the local pka of the side chain group of e in eee to be greater than, equal to, or less than 4.25? explain.

If you were designing a bumper for a car, would you prefer it to exhibit elastic or plastic deformation? why? consider the functions of a bumper in both a minor "fender-bender" and a major collision.

Apump is used to circulate hot water in a home heating system. water enters the well-insulated pump operating at steady state at a rate of 0.42 gal/min. the inlet pressure and temperature are 14.7 lbf/in.2, and 180°f, respectively; at the exit the pressure is 60 lbf/in.2 the pump requires 1/15 hp of power input. water can be modeled as an incompressible substance with constant density of 60.58 lb/ft3 and constant specific heat of 1 btu/lb or. neglecting kinetic and potential energy effects, determine the temperature change, in °r, as the water flows through the pump.

Fluids at rest possess no flow energy. a)- true b)- false