CH110-120 Midterm 1 Practice 2010 ANSWERS

# CH110-120 Midterm 1 Practice 2010 ANSWERS - CH110/120...

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CH110/120 Midterm 1 Review -ANSWERS The following formulas and constants will be provided (and a periodic table): Formulas and constants: T A A p X p nRT pV = = A kinetic kinetic N RT E mv E 2 3 2 2 1 = = 2 / 1 3 = MM RT v 1 2 2 1 MM MM v v = N A =6.022x10 23 particles/mol R= 0.08314 L bar mol -1 K -1 R= 8.314 L kPa mol -1 K -1 R= 8.314 J mol -1 K -1 1 atm = 1.01325 bar = 1.01x10 5 Pa = 760 mm Hg

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CH110/120 Midterm 1 – Sample Practice Questions I. Multiple Choice Questions: (See also practice quizzes on WileyPlus) The mass spectrum of chlorine atoms, which have two isotopes 37 Cl and 35 Cl, is shown below: mass number, A intensity 30 35 40 A= 37 What is the best estimate of the % abundance of 37 Cl and 35 Cl in this sample? a. 85% 35 Cl and 15 % 37 Cl b. 60% 35 Cl and 40% 37 Cl c. 75% 35 Cl and 25 % 37 Cl d. 67% 37 Cl and 33 % 35 Cl e. 50% 35 Cl and 50 % 37 Cl Adipic acid, whose line structure is shown below, is used in the manufacture of nylon used in carpet fiber, among other things. O HO O OH What is the chemical formula for adipic acid? a. C 4 H 2 O 4 b. C 6 H 2 O 4 c. C 6 H 6 O 4 d. C 6 H 8 O 4 e. C 6 H 10 O 4 Nitric acid is a corrosive acid capable of dissolving many metals, with the evolution of brown nitrogen dioxide gas as a byproduct. It is often sold as concentrated nitric acid which has [HNO 3 ] = 16. M. A common concentration used in the laboratory is 6.0 M HNO 3 . If you need 20. L of 6.0 M HNO 3 , what volume of concentrated nitric acid is required? a. 6.7 L b. 7.5 mL c. 0.75 L d. 5.7 L e. 7.5 L
A 1.345 g sample of solid residue from a hazardous waste dump is being analyzed for barium. The sample is dissolved and then sodium sulfate is added. The insoluble barium sulfate is dried, and a total of 73.8 mg of BaSO 4 is collected. What percent of the sample is barium? a. 0.323 % Ba b. 2.33 % Ba c. 3.23 % Ba d. 4.02 % Ba e. 5.23 % Ba Consider the reaction of nitrogen and hydrogen to produce ammonia. If we start with 56.0 g N 2 and 20.2 g of H 2 , what mass of ammonia can be prepared? N 2 + 3 H 2 Æ 2 NH 3 a) 34.1 g b) 68.1 g c) 76.2 g d) 113.7 g e) 170.6 g Thermite is a reaction that was once used to weld railroads together as shown below. A 48.0 g sample of Al(s) was reacted with 99.0 g of Fe 2 O 3 according to the equation below. What could be the theoretical yield of Fe(s) in grams?

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CH110-120 Midterm 1 Practice 2010 ANSWERS - CH110/120...

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