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Chemistry Questions and Answers March 10, 2020

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The set point of the control system shown in Fig. P12?1 is given a step change of 0.1 unit. Determine (a) The maximum value of?C?and the time at which it occurs (b) The offset (c) The period of oscillation Draw a sketch of?C(t) as a function of time. FIGURE P12-1
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R K1.6 5 (s 1)(2s 1) C
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The plastics industry uses a large amount of Phthalic anhydride, CaHO,, made by the controlled oxidation of naphthalene. 2C10Ha 9 O, 2 C.H.O, 4 CO 4 H20 Since some of the naphthalene is oxidized to other products, only 70.4 of the maximum yield predicted by the equation is actually obtained. How much phthalic anhydride would be produced in

The reaction between nitric oxide and oxygen is described by the following chemical equation 2NO (g) 0, (g) 2NO, (g) Suppose a twostep mechanism is proposed for this reaction, beginning with this elementary reaction NO (g) 0,(g) NO, (g)0 (g) Suppose also that the second step of the mechanism should be bimolecular. Suggest a reasonable second

Arsenic(III) oxide (As 2 O 3 ) is available in pure form and is a useful (but carcinogenic) primary standard for oxidizing agents such as MnO 4 - . The As 2 O 3 is dissolved in base and then titrated with MnO 4 - in acidic solution. A small amount of iodide (I - ) or iodate (IO 3 - ) is used to catalyze the reaction between H 3 AsO 3 and MnO 4 - .

Do the architectures in your organization recognize the different views (structures and relations) inherent in architecture? If so, which ones? If not, why not?

1. Draw the C4HBr isomer which gives rise to each spectrum below. (Note each spectrum (ac) shows a different isomer) 8. 8 6 4 8 (ppm) 0 The peak around 4 is a sextet and the peak just upfield of 2 is a quintet. The integration is 1233 (downfield upfield).,7 4 0 8 (ppm) From left to right the peaks are triplet, quintet, sextet, and triplet with
1. Draw the C4H9Br isomer which gives rise to each spectrum below. (Note: each spectrum (a-c) shows a different isomer!) 8 (ppm) The peak around 4 is a sextet and the peak just upfield of 2 is a quintet. The integration is 1:2:3:3 (downfield upfield).

Beef catalase has been used to accelerate the decomposition of hydrogen peroxide to yield water and oxygen Chem. Eng. Educ, 5, 141 (1971). The concentration of hydrogen peroxide is given as a function of time for a reaction mixture with a pH of 6.76 maintained at 30C. I (min) 0 10 20 so 100 Cno, (molL) 0.02 0.01775 0.0158 0.0106 (a) Determine the