decrease in the entropy of the system. One example of a process that approaches being isentropic are the rapid depressurization of gas in a cylinder. The entropy of the system remains in constant. Entropy is a type of energy (like heat‚ work‚ and enthalpy) and is by definition energy which is lost in a process. If a process is both reversible and adiabatic‚ then it is an isentropic process. An isentropic process is an idealisation of the expansion process which assumes there is no
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Chemistry 521 Exam I‚ Spring Quarter 7:30 - 9:00 PM‚ 25 April 2000 NAME 1. [10 points] What are the concentrations of HSO− ‚ SO2− ‚ and H+ in a 0.20 M KHSO4 solution? (Hint: 4 4 H2 SO4 is a strong acid; Ka = 1.3 × 10−2 for HSO− .) 4 2. [15 points] Calculate the pH of 1.00 L of the buffer 1.00 M CH3 COONa/1.00 M CH3 COOH (pKa = 4.74) before and after the addition of (a) 0.080 moles NaOH and (b) 0.12 moles HCl. (Assume there is no change in volume). 3. [10 points] The following reaction
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Fundamental of Engineering Calculation 1. Determine the following unit conversions to SI units: a. Density value of 60 lbft3 to kgm3‚ Ans: 961.1 kg/m3 b. Energy value of 1.7 ×103Btu to kJ‚ Ans: 1.8 x 103 kJ c. Enthalpy value of 2475 BtulbtokJkg‚ Ans: 5756 kJ/kg d. Pressure value of 14.69 psig to kPa‚ Ans: 201.88 kPa e. Viscosity value of 20 cp to Pa∙s‚ Ans: 2 x 10-2 Pa∙s Table of Conversion Factor 1 lb | 0.454 kg |
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N11/4/CHEMI/SP2/ENG/TZ0/XX 88116105 CHEMISTRY STandaRd lEvEl PaPER 2 Monday 7 November 2011 (afternoon) 1 hour 15 minutes INSTRUCTIONS TO CANDIDATES • • • • • Candidate session number 0 0 Examination code 8 8 1 1 – 6 1 0 5 Write your session number in the boxes above. Do not open this examination paper until instructed to do so. Section A: answer all questions. Section B: answer one question. Write your answers in the boxes provided. 19 pages © International Baccalaureate Organization
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What Factors Most Affect Evaporation? Intermediate-Level Science Projects Which Materials Insulate Best Against Windchill? Do Clouds Tell Us What Weather Is Coming? What Factors Most Affect Evaporation? Evaporation of a substance such as water occurs when the molecules in a liquid state absorb enough heat energy to vaporize into a gas. The heat energy‚ which causes the molecules to move‚ is called kinetic energy. The water molecules remain the same during this change‚ except that they’re
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stack. The material and energy balance in a plant design is necessary because this fixes the relative flow rates of different flow streams and temperatures in the flow sheet. Notations used: Msteam = Mass flow rate of steam. N +steam = enthalpy of steam. E = Mass flow rate of ethanol. A = Mass flow rate of acetaldehyde. H = Mass flow rate of hydrogen. Cp = specific heat capacity. /DWHQW KHDW RI YDSRUL]DWLRQ Basis: One hour of operation. Amount of acetaldehyde to be produced =
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Biological Nanostructures and Applications of Nanostructures in Biology Electrical‚ Mechanical‚ and Optical Properties BIOELECTRIC ENGINEERING Series Editor: Bin He University of Minnesota Minneapolis‚ Minnesota MODELING AND IMAGING OF BIOELECTRICAL ACTIVITY Principles and Applications Edited by Bin He BIOLOGICAL NANOSTRUCTURES AND APPLICATIONS OF NANOSTRUCTURES IN BIOLOGY Electrical‚ Mechanical‚ and Optical Properties Edited by Michael A. Stroscio and Mitra Dutta NEURAL ENGINEERING Edited
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Introduction The ability to identify metals is an extremely important one. With this ability‚ we can correctly assign different traits‚ and use the metal in its most suitable environment. This is important to many industries‚ where metals play an increasingly large role. Determining the identity of the metal is paramount to determining what conditions to use the metal under. This seemly simple task is‚ however‚ can be quite complex‚ as there are many ways by which one can identify a metal
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at 1 atm pressure? a) (CH3)2CHNH2 b) (CH3)3N c) CH3CH2NHCH3 d) CH3CH2CH2NH2 e) H2NCH2CH2NH2 8. Which of the following ionic compounds should have the highest melting point? a) LiBr b) MgO c) NaI d) CaS e) NaCl 9. Given the bond enthalpies N-H (389)‚ Cl-Cl (243)‚ N-Cl (201)‚ H-Cl (431) in kJ/mol‚ compute ΔH in kJ/mol for: NH3 + Cl2 NH2Cl+ HCl a) 0 b) -393 c) -110 d) +393 e) +71 10. Which of the following molecules contains both ionic and covalent bonds? a) C6H14 b)
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