CH110-120 Midterm 2 Review 2010 answers

CH110-120 Midterm 2 Review 2010 answers - CH110/120 Midterm...

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CH110/120 Midterm 2 Review General Information Midterm 2 will take place on Friday, November 19 th , from 5:30 pm to 7:00 pm Section A: BA201 Section B: BA101 (last names A-K) Section B: BA102 (last names L-Z) Bring the following: pens , pencil s, and a calculator . Note: You will need a pencil to fill in the answer cards for the multiple choice questions. A periodic table and information sheet with necessary data and formulas will be provided with the exam. The midterm will cover material from all of Chapters 3, 4, 5, and 6. The format will include multiple choice (approximately 25 at 1 mark each) and some problems/short answer questions worth a total of 15 marks. (Part marks will be assigned for problems, so show your work clearly and legibly.) The following formulas and constants will be provided (and a periodic table): E photon = h ν λν = c E kinetic = 2 2 mu λ = mu h E n =(-2.18x10 -18 J)/n 2 q=nC Δ T N A =6.022x10 23 particles/mol c=3.00x10 8 m/s h=6.626x10 -34 Js mass of an electron = 9.1094x10 -31 kg charge of an electron = 1.602x10 -19 C R= 8.314 J mol -1 K -1 Selected Molar Heat Capacities at 25°C Substance Al (s) C (s, graphite) Fe (s) H 2 O (l) C (J mol -1 °C -1 ) 24.35 8.527 25.10 75.291 Selected Bond Energies (in kJ/mol, rounded to the nearest 5 kJ/mol): H-H 435 H-Cl 430 H-Br 365 C-H 415 N-H 390 O-H 460 C-C 345 C=C 615 C C 835 O-O 145 O=O 495 C=O 750
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CH110/120 Midterm 2 – Sample Practice Questions I. Multiple Choice Questions: (See also practice quizzes on WileyPlus) Assume that coal is essentially all carbon and has a density of 1.5 g/mL. a) How much heat is produced if a piece of coal 7 cm x 5 cm x 6 cm undergoes complete combustion by the following reaction: C ( s ) + O 2 ( g ) CO 2 ( g ) H = -394 kJ b) What mass of water could be heated from 25 °C to 100 °C with this amount of heat? a. –1.0 x10 4 kJ, 3.3 x10 4 g of H 2 O * b. +1.0 x10 4 kJ, 33g of H 2 O c. 5.0 x10 3 kJ, 33 g H 2 O d. –5.0 x10 3 kJ, 3,300g of H 2 O e. –1.0 x10 4 kJ, 1.8 x10 3 g of H 2 O How many kJ of energy will be converted to heat when a 1.4 x 10 3 kg automobile stops from a speed of 67 km/hr? a. 240 kJ * b. 265 kJ c. 290 kJ d. 315 kJ e. 400 kJ Estimate E for the following reaction using bond enthalpies: C 2 H 4( g ) + Br 2 ( g ) C 2 H 4 Br 2 ( g ) a. –275 kJ/mol b. –90 kJ/mol * c. 90 kJ/mol d. 275 kJ/mol e. -360 kJ/mol The combustion of an organic compound releases 35.6 kJ of energy and causes the temperature of a constant volume calorimeter to increase by 4.76 °C . What is the heat capacity of the calorimeter? a. 3.05 kJ/K b. 5.67 kJ/K c. 6.90 kJ/K d. 7.48 kJ/K * e. 12.3 kJ/K A 1.72 g sample of the saccharide, C 6 H 12 O 6 , shown below is combusted in a constant volume calorimeter of heat capacity 8.21 kJ/K. The initial temperature is 22.1°C.
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O OH H H HO H H OH H HO HO The final temperature is 25.4°C. What is the energy released per mole of this sugar upon combustion?
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This note was uploaded on 10/14/2011 for the course CHEM 110 taught by Professor Maly during the Fall '10 term at Wilfred Laurier University .

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CH110-120 Midterm 2 Review 2010 answers - CH110/120 Midterm...

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