AP Chem Exam - ‘98 1. Solve the following problem related to the solubility equilibria of some metal hydroxides in aqueous solution. (a) The solubility of Cu(OH)2(s) is 1.72 x10–6 g/100. mL of solution at 25° C. (i) Write the balanced chemical equation for the dissociation of Cu(OH)2(s) in aqueous solution. Cu(OH)2 Cu 2+ + 2 OH – (ii) Calculate the solubility (in mol/L) of Cu(OH)2 at 25 °C. (1.72 x10–6 g/0.100 L)(1 mol/97.5 g) = 1.76 x10–7 mol/L (iii) Calculate
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Assignment Chapter 6 Concept Explorations 6.29. Thermal Interactions Part 1: In an insulated container‚ you mix 200. g of water at 80ºC with 100. g of water at 20ºC. After mixing‚ the temperature of the water is 60ºC. * a. How much did the temperature of the hot water change? How much did the temperature of the cold water change? Compare the magnitudes (positive values) of these changes. 200g of water at 80°C = hot water 100g of water at 20˚C = cold water After mixing the temperature is
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conversion efficiency is approximately 21% at the Darajat vapour-dominated system‚ with a worldwide efficiency average of around 12%. The use of binary plants in low-enthalpy resources has allowed the use of energy from fluid with enthalpy as low as 306 kJ/kg‚ resulting in a net conversion efficiency of
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below Ea= (-R)(slope) Where Ea is the activation energy‚ R is the rate constant (8.314 J/mol*K) Ea= -8.314 (-23616) Ea= 196343.6 J/mol Ea= 196.3 kJ/mol Ea= 196 kJ/mol +/- 0.51% iii) Calculating the maximum and minimum values Maximum: 188 kJ/mol Minimum: 173 kJ/mol 2) Determining the percent error Theoretical value: 195 kJ/mol Percent error= | (theoretical-experimental) / (theoretical) |*100 Percent error= | (195-196) / (195) |*100 Percent error=> +/- 0.51% Percent
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heat capacity for the calorimeter was based on the heat of combustion for ethanol‚ which was then used to determine the heat of combustion for biodiesel. The average heat of combustion for biodiesel was ∆Hcomb= -13090.83 kJ/mole‚ as opposed to the theoretical value of -11496.6 kJ/mole‚ which resulted in a 13.9% difference. Furthermore‚ taking into consideration the ecotoxicity of biodiesel‚ its effect on the environment‚ and fuel efficiency‚ biodiesel proved to be the more favorable fuel relative
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Periodic Table Trends Quiz 1. The most reactive metals are located in the lower left hand corner of the periodic table 2. Which of the following atoms listed below has the largest atomic radius? Ca 3. Compared to the atomic radius of a rubidium atom‚ the atomic radius of a strontium atom is smaller. The smaller radius is primarily the result of the strontium atom having greater effective nuclear charge 4. An element is most likely to have properties similar to those of another
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Part I Multiple choice or short answer questions 1) (2 points) Identify a solid a. Definite volume and no definite shape b. no definite volume and no definite shape c. definite volume and definite shape 2) (2 points) A substance composed of two or more elements in a fixed‚ definite proportion is a. A solution. b. A heterogeneous mixture. c. An alloy. d. A homogeneous mixture. e. A compound. 3) (2 points) Read the water
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Brayton Cycle (Gas Turbine) for Propulsion Application Analysis Engineering Software P.O. Box 1180‚ Germantown‚ MD 20875 Phone: (301) 540-3605 FAX: (301) 540-3605 E-Mail: info@engineering-4e.com Web Site: http://www.engineering-4e.com Brayton Cycle (Gas Turbine) for Propulsion Application Analysis by Engineering Software Course Category: Engineers Course Level: Intermediate Credit: 1 Hour -- i -- Brayton Cycle (Gas Turbine) for Propulsion Application Analysis Course Description The ideal cycle
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Chem 17 ▪ General Chemistry Laboratory II Experiment 1 Calorimetry INTRODUCTION Chemical reactions are usually accompanied by the evolution (exothermic reaction) or absorption (endothermic reaction) of heat energy. When measured at constant pressure‚ the heat evolved (qp < 0) or absorbed (qp > 0) is equal to the enthalpy change‚ symbolized by ΔH. ΔH is positive for an endothermic process and negative for an exothermic one. If H f is the enthalpy of the final state and Hi of the initial state
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and c. Overall isothermal efficiency. 3. A single stage impulse turbine has a speed of 1000rpm and a mean blade ring diameter of 60 cm. The nozzles are inclined at 22° to the plane of rotation and the specific enthalpy drop is 190 KJ/kg. Determine: a. The relative velocity of the steam at inlet‚ and b. The blade inlet angle. 4. An engine consumes fuel of calorific value 44MJ/Kg at a rate of 45tonne/day. It the indicated thermal efficiency is 39% and
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