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QUESTION 1 [15 Marks] 1000 Kg/hr of waxed paper is to be dewaxed by counter-current leaching with kerosene in stage type equipment. The paper contains 30% paraffin wax and 70% paper pulp. The pulp leaving the leaching process must not contain over 0.002 Kg wax per Kg pulp. The kerosene solvent entering the process is to contain 0.005 Kg wax / Kg kerosene. Experiments show that the pulp retains 1 Kg of kerosene per Kg pulp as it exits the extractor. The kerosene leaving the process contains 0.06 Kg wax/Kg kerosene. Calculate the flowrates per hour of the pulp stream leaving process (underflow), the wash stream (overflow) and the solvent flowrate. QUESTION 2[15 Marks] A saturated solution containing 40 percent by mass of MgSO$_{4}$ in water is fed into a crystallizer and slowly cooled to 298K to obtain epsom salt (MgSO$_{4}$.7H$_{2}$O) crystals. If during the process 5% of total water is lost due to evaporation and the solubility of MgSO$_{4}$ at 298K is 30kg per 100kg water, calculate how much of the saturated solution must be fed into the crystallizer to yield 500 kg of Epsom salt (MgSO$_{4}$.7H$_{2}$O). (MgSO$_{4}$.7H$_{2}$O molar mass = 246 kg per kmol, MgSO$_{4}$ molar mass = 120 kg per kmol)

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For which of these reactions at 25°C does the enthalpy change represent a standard enthalpy of formation? For each that does not, what changes are needed to make it an equation whose $\Delta H$ is an enthalpy of formation? a. $2Na(s) + \frac{1}{2}O_2(g) \rightarrow Na_2O(s)$ b. $2K(l) + Cl_2(g) \rightarrow 2KCl(s)$ c. $C_6H_{12}O_6(s) \rightarrow 6C(diamond) + 6H_2(g) + 3O_2(g)$ Solution

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compare a range of physical and chemical contraception methods. e.g. the birth control pill, and/or condom and diaphragm, and/or Norplant® and/or DMPA (Depo- Provera®), and/or tubal ligation and vasectomy. The relative merits of each method should be considered.

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A new product strategy through which a company deliberately fixes a higher price with a view to recovering developmental costs faster and to generate higher profits

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17. Andrea is a female manager in a manufacturing plant, and she tends to favor the women who work for her. She relies on them more when problems arise, assigns them desired shifts and overtime work, and gives them higher raises than she does for her male work- ers. Andrea's behavior represents... a. Stereotyping b. Prejudice c. Discrimination d. Stereotype threat 18. Erin uses cocaine recreationally. The drug is beginning to affect her job performance; deep down she knows this. What might Erin tell herself to resolve the dissonance between the notion that she enjoys using cocaine and the knowledge that it's affecting her work? a. "I only use drugs on occasional weekends." b. "If my work has slipped lately, it's not the drugs -- it's the extra pressure lately and the lack of recognition around here." c. "Drugs have no effect on my job." d. Any of these 19. One makes an attribution when one.... a. Forms an evaluation of an object, person, event, or behavior b. Resolves the conflict between two contradictory thoughts c. Is influenced by a persuasive message d. Decides on the causes of an individual's behavior 20. The attribution process is influenced by... a. The time one has to formulate an explanation of an individual's behavior b. The attention one can devote to formulating an explanation of an individual's behavior c. The degree to which one is motivated to formulate an explanation of an individual's behavior d. All of these

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Question 15 You are considering a new supplier that you estimate would reduce your costs 0.024, increasing overall EBIT margin the same amount, or 240 basis points. Using 5-way DuPont ratios, what would be the ROE after the changes are made? Net income 12.436 Pretax profit 16.806 EBIT 20.007 Total Sales 153.9 Avg Assets 81 Avg Equity 45 O 0.3274 O 0.3373 O 0.3459 O 0.3165 O 0.3103

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A. Graves' disease B. Cushing syndrome C. Diabetes mellitus D. Acromegaly E. Diabetes insipidus F. Goiter G. Dwarfism (pituitary) H. Hyperparathyroidism I. Pheochromocytoma J. Addison's disease Enlargement of thyroid, sometimes due to lack of iodine in the diet Hyposecretion of ADH with excessive volumes of urine Hypersecretion of hGH (human growth hormone) during adulthood Hyperthyroid/exophthalmos/anxiety/weight loss Hypersecretion of catacholamines (epinephrine) by adrenal medulla Hyposecretion of hGH (human growth hormone) during growth years Hyposecretion of the adrenal cortex hormones or ACTH from anterior pituita Hypersecretion of the adrenal cortex hormones Hyperglycemia due to insufficient secretion of insulin from the pancreas Hypercalcemia/bone weakness/fatigue/mental changes

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Some formulae: $\text{GR} = \frac{\sqrt{5} - 1}{2} = 0.618034$ $x_{i+1} = x_i - \frac{f(x)}{f'(x)}$ $a_1 = \frac{\sum_{i=0}^{n} x_i y_i - (\sum_{i=0}^{n} x_i)(\sum_{i=0}^{n} y_i)}{\sum_{i=0}^{n} x_i^2 - (\sum_{i=0}^{n} x_i)^2}$ $a_0 = \sum_{i=0}^{n} y_i - a_1 \sum_{i=0}^{n} x_i$ $r = \frac{\sum_{i=0}^{n} x_i y_i - (\sum_{i=0}^{n} x_i)(\sum_{i=0}^{n} y_i)}{\sqrt{\sum_{i=0}^{n} x_i^2 - (\sum_{i=0}^{n} x_i)^2}\sqrt{\sum_{i=0}^{n} y_i^2 - (\sum_{i=0}^{n} y_i)^2}}$ $I = \frac{(b-a)}{2n} \left[ f_0 + 2 \sum_{i=1}^{n-1} f_i + f_n \right]$ $I = \frac{(b-a)}{3n} \left[ f_0 + 4 \sum_{i=1,3,5}^{n-1} f_i + 2 \sum_{i=2,4,6}^{n-2} f_i + f_n \right]$

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(10) For the following array, convert it to a valid max heap using the O(n), bottom-up Max-Heapify, showing the final heap in array form: Input array: 5 2 3 7 4 6 9 Output array:

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The bicycle gear train in the picture has the following measurements: • The crank arm AB has length 170 mm. • The radius of the front chainring C is 90 mm. • The radius of the rear sprocket D is 30 mm. • The diameter (not radius!) of the rear wheel is 700 mm. If the tip B of the crank arm has a speed of 1.5 m/s, what is the speed of point E at the edge of the wheel? Express the speed in meters per second and also in kilometers per hour.

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elizabeth m.