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A wet stream at a pressure of 5.0 bar with a quality of 0.85 is isothermally “dried” by evaporating the entrained liquid. The flow rate of the dried steam is 52.5 m^3/h. (a) Use the steam tables to determine the temperature at which this operation occurs,
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Thermodynamics
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You put a thermometer in a pot of hot water and record the reading. What temperature have you recorded? Explain. I. The temperature of the water; II. The temperature of the thermometer; III. An equal average of the temperature of the water and thermometer
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Thermodynamics
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Which of the following statements is true about a heating curve? 1. It shows what happens to a substance as heat is applied. 2. It is a plot of temperature vs. time. 3. At the plateaus, melting or vap
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Thermodynamics
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Why is the enthalpy of sublimation always larger than the enthalpy of vaporization?
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Thermodynamics
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A person s body temperature is 101.6 F, indicating a fever of 3.0 F above the normal average body temperature of 98.6 F. How many degrees above normal is this body temperature on the Celsius scale?
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How many kilojoules are released when 8.2 grams of water condenses at 100 degrees Celsius and cools to 15 degrees Celsius?
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Thermodynamics
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At a Chicago Bulls game, 20,000 tickets were sold at $30 apiece. The game was sold out and some people did not get tickets. This suggests that the selling price: A. was at equilibrium. B. was below equilibrium. C. was above equilibrium. D. could not have
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Mixing 17.6 kg of ethylene glycol (commercial antifreeze, C 2 H 6 O 2 , with 6.00 gal of water lowers the freezing point to -10.0 F. Suppose you wanted to accomplish the same thing with sugar (sucrose, C 12 H 22 O 11 ) instead of ethylene glycol. How
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How do glycerol, antifreeze, and various concentrations of NaCl affect freezing point?
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Calculate the freezing point in degrees Celsius for 100 grams sucrose C_{12}H_{22}O_{11}, a common sweetener, dissolved in 1000 grams of water.
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Thermodynamics
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An electric hot water heater takes cold water at its inlet pipe and delivers hot water at its outlet pipe. Between these two pipes is a large water container. Many electric hot water heaters have two separate heating elements: one near the top of the wate
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Thermodynamics
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Why is the idea of equilibrium in systems somewhat misleading in regard to environmental questions? Is it ever possible to establish a balance of nature?
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Thermodynamics
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A cast iron pipe has an inside diameter of d = 208 mm and an outside diameter of D = 236 mm. The length of the pipe is L = 3.0 m. The coefficient of thermal expansion for cast iron is alpha_1 = 12 1 \times 10^{-6}/^o C. Determine the dimension changes ca
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A 20 kg bag of luggage is rolled across a horizontal floor by a force of 50 N applied to the handle which makes an angle of 65 degrees with the horizontal. If the bag moves at constant speed, what is
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A 70-kg hockey player moving at 8.0 m/s stops quickly. How much ice melts due to the friction between the player’s skates and the ice? Assume that only 60% of the energy lost by the skater goes to mel
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What type of solution are the following? 1. Honey 2. Hydrogen peroxide 3. Chlorine bleach 4. Lemon water 5. Hair spray 6. Air freshener spray 7. Toothpaste 8. Mothballs
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Thermodynamics
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The solubility of calcium sulfate in water is 0.667 grams per liter. If a calcium sulfate solution had a concentration of 0.860 grams per liter, it would be said to be: a. saturated b. supersaturated c. unsaturated
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Thermodynamics
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Will the liquid in a Galileo thermometer freeze?
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A circular steel plate of radius 0.10 m is cooled from 350 degrees C to 20 degrees C. By what percentage does that plate’s area decrease?
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A 3.0 m wooden platform is suspended from the roof of a house by ropes attached to its end. A painter whose mass 80 kg stands 1.2 m from the left-hand end of the platform, whose own mass is 18 kg. Fin
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Thermodynamics
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1. It is claimed that fruits and vegetables are cooled by 6 C for each percentage point of weight loss as moisture during vacuum cooling. Using calculations, demonstrate if this claim is reasonable
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A manual for student pilots contain the following passage: “When an airplane flies at a steady altitude, neither climbing nor descending, the upward lift force from the wings equals the airplane’s weight. When the airplane is climbing at a steady rate, th
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What is the glass transition temperature of epoxy?
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For the chemical reaction SO2(g) + Cl2(g) arrow SO2Cl2(g), what is the value of Delta G at 600 K?
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If the solubility of sodium (molar mass = 82 g/mol) is 76 grams per 100 grams of water, which of the following solutions would be considered supersaturated? \ A. 8.5 moles of sodium acetate in 1 L water B. 5.5 moles of sodium acetate dissolved in 500 m
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a) If a saturated solution of sodium nitrate, NaNO3, is prepared, the following equilibrium exists: NaNO_3 (s) Leftrightharpoons Na+ (aq) + NO_3^- (aq) If nitric acid is added to the saturated solutio
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