Lysine has the side chain (C H 2) 4 N H 3 plus. The alpha amino group is protonated and positively charged. The alpha carboxylic acid group is protonated and neutral. At what pH would the structure be the predominant ionization state? Consider the ionization state of all three of the functional groups.

gasoline is a mixture. it contains several different kinds of compounds that can be present in a variety of ratios.

answer: semi-infinite solid initially at a uniform temperature of 400 ◦c is cooled at its surface by convection. the cooling fluid at a constant temperature of 200 ◦c has a convective coefficient (ha) of 250 w/m2.k. the physical properties of the solid: k = 20 w/m.k and α = 4 * 10-5  m2/s. using δx = 0.04 m and δt = 10 s. write the finite difference equations describing the transient heat transfer of the first five δx and the temperature profile after 30 s.