Final-exam chem prac

Final-exam chem prac - Chemistry 1035 Final Exam December...

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Chemistry 1035 Final Exam December 7, 2007 THIS IS FORM A Name __________________________ 6.02 x 10 23 entities/mol c = 3.00 x 10 8 m/s h = 6.63 x 10 -34 J s R = 0.0821 L atm/K mol or R = 8.314 J/K mol Choose the single best answer to each question. 1. How many proton, neutrons and electrons are in the ion 31 3 P - ? 1. 15 p, 31 n , 15 e - 2. 15 p, 16 n, 12 e - 3. 15 p, 16 n, 15 e - 4. 15 p, 16 n, 18 e - 2. A gold brick measures 5.00 cm x 10.0 cm x 20.0 cm. If the density of gold is 19.3 g/cm 3 , what is the mass of the brick in pounds? (1 lb = 453.6 g) 1. 56.4 lb 2. 23.5 lb 3. 73.2 lb 4. 42.5 lb 3. Write the formula between the 4 th period alkaline earth metal and the nitrate ion. 1. Ca(NO 2 ) 2 2. Ca(NO 3 ) 2 3. KNO 4 4. Sr(NO) 2 5. Sr 3 (NO 3 ) 2 4. A bullet is fired at a speed of 2435 ft/s. What is this speed expressed in km/hr? (1 ft = 0.3048 m) 1. 2672 km/hr 2. 8766 km/hr 3. 2876 km/hr 4. 1982 km/hr
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5. What is the formula of calcium phosphate? 1. Ca 2 PO 4 2. CaPO 4 3. Ca 3 (PO 4 ) 2 4. Ca 2 (PO 3 ) 3 6. What is the name of the Cr(SO 4 ) compound? 1. Chromium sulfate 2. Monochromium sulfite 3. Chromium(II) sulfide 4. Monochromium sulfate 5. Chromium sulfite 6. Chromium(II) sulfate 7. An unknown element, X, reacts with chlorine to form an ionic compound having the formula XCl 2 . If the ion of X has 18 electrons, identify the element. 1. Ca 2. Sr 3. Ar 4. S 5. K 8. A sample of NH 3 (MW=17.0g) contains 5.37 x 10 24 NH 3 molecules. How many grams of NH 3 are in the sample? 1. 174 g 2. 212 g 3. 81.3 g 4. 152 g 9. How many atoms of hydrogen are contained in a 100. g sample of the main ingredient in aspirin, C 9 H 8 O 4 (MW=180.1 g/mol)? 1. 1.97 x 10 24 atoms 2. 3.34 x 10 23 atoms 3. 2.67 x 10 24 atoms 4. 4.82 x 10 26 atoms
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Consider the following balanced reaction: 2 Al(s) + Fe 2 O 3 (s) Al 2 O 3 (s) + 2 Fe(s) If 250.0 g of Al (MW=27.0 g/mol) are reacted with 100. g of Fe 2 O 3 (MW=159.7 g/mol), what mass of Fe (MW=55.8 g/mol) is produced? 1. 34.9 g 2. 69.9 g 3. 103 g 4. 115 g 11. A compound of iodine (MW=129.7 g/mol) and fluorine (19.0 g/mol) is analyzed and a sample weighing 2.75 g is found to contain 1.90 g of iodine. What is the empirical formula of the compound? 1. IF 3 2. IF 3. IF 5 4. I 2 F 3 5. I 2 F 5 12. How many grams of Zn(MW=65.4 g/mol) are required for complete reaction with 35.0 mL of 0.750 M HCl? Zn(s) + 2HCl(aq) ZnCl 2 (aq) + H 2 (g) 1. 0.858 g 2. 21.4 g 3. 1.32 g 4. 1.72 g 13. A solution is formed by dissolving Pb(C 2 H 3 O 2 ) 2 and CaS. What precipitate(s) will be formed? 1. PbS and Ca(C
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This note was uploaded on 09/19/2011 for the course ENGE 1114 taught by Professor Twknott during the Fall '06 term at Virginia Tech.

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Final-exam chem prac - Chemistry 1035 Final Exam December...

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