chem-midterm1

chem-midterm1 - Chemistry 1A, Spring 2007 Midterm Exam I,...

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Page 1 Chemistry 1A, Spring 2007 Midterm Exam I, Version 1 Feb 5, 2006 (90 min, closed book) Name:_______KEY_______________ SID:____________________________ TA Name:_______________________ 1.) Write your name on every page of this exam. 2.) This exam has 40 multiple choice questions. Fill in the Scantron form AND circle your answer on the exam. 3.) There is no penalty for guessing, so answer every question. 4.) Some questions may require bubbling in more than one choice to receive credit.
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Name_________________________ Page 2 800 600 400 200 IR Red Green Blue UV Wavelength (nm) Color and Wavelength of Light Δ G ° = Δ H ° - T Δ S ° Δ H ° = Σ Δ H ° f (products) - Σ Δ H ° f (reactants) Δ S ° = Σ S ° (products) - Σ S ° (reactants) Δ G ° = Σ Δ G ° f (products) - Σ Δ G ° f (reactants) S = k B lnW Δ G ° = - RTln K R S T R H K ° Δ + ° Δ = 1 ln Δ G ° = - nF Δ Є º pX = - log X ] [ ] [ log HA A pK pH a + = E = h ν λν = c λ deBroglie = h / p = h / mv E kin (e-) = h ν - Φ = h ν - h ν 0 = R n Z E n 2 2 x p ~ h p = mv Particle in a box (1-D Quantum): E n = h 2 n 2 /8mL 2 ; n = 1, 2, 3. .. PV = nRT RT E kin 2 3 = M 3RT v rms = Δ E = q + w w = - P ext Δ V T nR E Δ = Δ 2 3 N 0 = 6.02214 x 10 23 mol -1 R = 2.179874 x 10 -18 J R = 3.28984 x 10 15 Hz k = 1.38066 x 10 -23 J K -1 h = 6.62608 x 10 -34 J s m e = 9.101939 x 10 -31 kg c = 2.99792 x 10 8 m s -1 Gas Constant: R = 8.31451 J K -1 mol -1 R = 8.20578 x 10 -2 L atm K -1 mol -1 T (K) = T (C) + 273.15 F = 96,485 C / mol 1 V = 1 J / C 1 nm = 10 -9 m 1 kJ = 1000 J
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Name_________________________ Page 3 S ECTION 1: A TOMS , M OLECULES AND M OLES 1.) What is the coefficient of oxygen in the balanced combustion reaction of one (1) mole of heptane (C 7 H 16 )? C 7 H 16 + O 2 CO 2 + H 2 O A) 1 B) 2 C) 4 D) 6 E) 11 2.) If one mole of heptane (C 7 H 16 ) is burned in 12 moles O 2 , which is true when the reaction goes to completion? A) All the oxygen is consumed. B) All the heptane is consumed. C) No reagents remain. D) An equal mass of each reagent remains. E) None of these. 3.) How many moles of water are produced when 84 g of heptane are burned in 164 g of oxygen? A) 6.7 B) 13.4 C) 7.4 D) 6.0 E) 3.7 4.) What is the molar concentration (M) of an alcoholic beverage which is 24% ethanol (C 2 H 5 OH) by volume in water (ethanol density: 0.90 g/mL)? A) 22 B) 0.22 C) 4.7 D) 47 E) 10 5.) What is the mass (in grams) of 2.5 L of gasoline if the density of gasoline is 0.79 g/ml? A) 2.0 B) 1.98 C) 2.0e3 D) 1.98e3 E) 3.2e3 6.) What will the atomic number be of an individual chlorine atom that is removed from a chlorofluorocarbon (C x Cl y F z ) pollutant in the air? A) 16 B) 17 C) 35 D) 37 E) can’t tell 7.) Which is a possible empirical formula for Nicotine, if a 2.38e-3 mole sample burns in oxygen to produce 1.072 g carbon dioxide, 0.307 g water and 0.068 g of nitrogen?
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chem-midterm1 - Chemistry 1A, Spring 2007 Midterm Exam I,...

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