1. Determine the maximum allowable vacuum that can be applied to a low-carbon-steel cylindrical vessel 10 ft in outside diameter with elliptical dished heads (k = 2.0). The head and shell thickness are both in., and the vessel is 30 ft long (tangent line to tangent line). 2. Determine the minimum number of equally spaced circumferential shell stiffeners required to permit use of full vacuum with the vessel described in problem 1.

HCl is slightly soluble in water O True O False Systematic Errors: have a definite value, an assignable cause, and are of the same magnitude for replicate measurements O False O True

avoid typing answers, hand written only

Which of the following is TRUE about column chromatography? 1. Components with greatest affinity elute first II. Components with least affinity elute first III. the position of peaks on the time axis can be used to determine components of the sample IV. Components elute in a random manner V. Components elute according to their concentration in the mixture Select one: O a. Il and III O b. IIl and IV O c. IIl and V O d. All of the statements are false O e. land II