177Exam1KeyF07

177Exam1KeyF07 - PROF. THOMAS J. GREENBOWE DR. KATHY BURKE...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: PROF. THOMAS J. GREENBOWE DR. KATHY BURKE HOUR EXAM I SEPTEMBER 10, 2007 FALL 2007 THIS EXAM CONSISTS OF 22 QUESTIONS ON 6 PAGES GRADES} PARTS POINTS SCORE Page 2 30 pts Page 3 20 pts Page 4 26 pts Page 5 26 pts TOTAL 102 pts CHEM 177 NAME 8&5 wer‘ K41: RECIT. INSTR. RECIT. SECT. NOTE: THE METHOD YOU USE IN SOLVING QUESTIONS MUST BE CLEARLY SHOWN IF YOU ARE TO RECEIVE FULL CREDIT. QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THE LAST PAGE CONTAINS USEFUL INFORMATION AND A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR ADDITIONAL REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON Teaching Assistants and Recitation Sections Name Bernie Anding Cynthia Bunders Shantha Daniel Christopher Ebert Tanya Gupta Emily Hull Zainab Khan Brandon Kobilka Rose Kohl Jason Lupoi Nataliya Markina Emily McDanel Megan Mekoli Derrick Morast Sahana Nagappayya Nicholas Nagle Gerald Pollock Nathan Schulz Justin Valenstein Anthony Young Chad Yuen THE TEAR AWAY PAGE. Sections Time 6, 29 11:00, 3:10 23 8:00 ‘ 5, 27 10:00, 12:10 13, 17 9:00, 12:10 9,11 2:10, 5:10 28, 35 2: 10, 5:10 10 4:10 2, 4 9:00, 10:00 20 2:10 8, 15 2:10, 11:00 16 12:10 12 8:00 24, 25 10:00, 11:00 30, 34 4:10, 9:00 18, 22 1:10, 4:10 32, 33 4:10, 5:10 7,21 1:10,3:10 1 8:00 19, 26 1:10, 12: 10 3 9:00 14, 31 10:00, 11:00 THE LAST DAY TO DROP CHEM 177 AND ADD CHEM 50 IS WEDNESDAY, SEPTEMBER 19, AT 5:00 P.M. SEE YOUR ADVISOR TO OBTAIN THE DROP/ADD FORM AND GO TO THE GENERAL CHEMISTRY OFFICE, ROOM 1608 GILMAN HALL. Clam“ pr? Pa” .2007 2 Ans Her K‘Q/ PART I - Multiple Choice. (12 questions at 3 pts each = 36 pts total) 1. 10. Do the indicated arithmetic and give the answer to the correct number of significant figures. 2.02 (1) 1,082 “F (1.5 lex 61.3) +2.01 = a) 2.0192 b) 2.0 c) 2.019 e) 2.019195 ,114°F Silver has a density of 10.5 g/cma. What mass of silver would be required to cover a Canadian football playing surface of 109.73 m x 54.864 m to a depth of 1.00 mm? (1 inch = 2.54 cm) @63 Mg Table salt (sodium chloride) is 39.1% sodium. How many grams of salt contains 72.0 g of sodium? @ 184 g salt Calculate the molecular mass of menthol, CmHmO. Lead melts at 601.0 "C. What temperature is this in °F? a) 302 "F b) 365 "F 0) 1,050 "F a) 632 kg 0) 6.0 x 10‘5 g d) 6.3 x 108 g e) 6.9 x 105 g a) 28.2 g salt b) 72.0 g salt (1) 2,820 g salt e) 1.84 x 105 g salt 156 amu b) 140 amu c) 29 amu d) 146 amu e) 136 amu What is the average mass, in grams, of one atom of iron? a) 6.02 x 1023 g b) 1.66 x 10-24 g @928 x 10” g d) 55.85 g e) 55.85 x 10r23 g How many fluorine atoms are infigfifl‘ g of F2? a) 6.02 x 1023 atoms £54? b) 0.145 atoms 0) 0.292 atoms (1) 8.78 x 1022 atoms 1.76 x 1023 atoms (3 pts) Which has the largest % by mass C? @ chnso2 Atoms of the same element with different mass numbers are called a) C02 b) CaCO3 a) ions b) neutrons C) allotropes d) chemical families ®isotopes Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine-37. a) 37p,37e,17n b)17p,17e,37n@17p,17e,20n d) 37p,17e,20n e)17p,37e,17n (Loam PM! .1001} s fixmwer1Q/ 11. Ernest Rutherford’s work lead to the conclusion that a) Cathode rays were actually electrons. b Oil drops could be used to carry electrical charge. Most of the volume of the atom is empty space and the tiny dense nucleus contains the positive charge and most of the mass of the atom. d) Protons are found throughout the volume of the atom. 12. Reaction of A (white spheres) with B (black spheres) is shown schematically in the following diagram. Which equation best describes the stoichiometry of the reaction? a) A2 + 213 —> A2132 @2A + B2 —> Asz b) 10r—t+5132-+5131232 d)5A+5B2«+5AzBZ PART II — Problems. Show all work. Answers should include appropriate units and contain the correct number of significant figures 13. (4 pts) Classify each of the following as an element, a compound, or a mixture. a) table salt Compouné b) baking soda 90% n c) wine VMFLAMPC‘? (1) oxygen gas Cilflwxg 9+ 14. (2 pts) Write the following measurements in scientific notation with 3 significant figures. a) 347.56m 342M313“ b) 00000069020 L G ‘90 X I 0” 6 L. 15. (8 pts) Classify the following as either a physical or a chemical property. a) Ice melts at 0 "C PL}: Hle b) Newspaper burns. Clack“ FCaJ 0) Glass breaks. PL: 3 {Cas' cl) The vitamin content of foods decreases if left in contact with oxygen in the air for three days . C M‘C Chaim Fall 20031 4 fimwcr ’07 l6. (12 pts) Describe whether each of the following molecular pictures represents a homogeneous solution, a single substance, or a heterogeneous mixture. Indicate whether the picture contains an element, a chemical compound, more than one element, more than one compound, an element and a compound, or some other combination of substances. 121mm. LtQi‘tfoyCrw-OMJ mmw Owe 17. (6 pts) Naturally occurring magnesium (one of the elements in milk of magnesia) is composed of 73.99% of 24Mg (23.9850 atomic mass units), 10.00% of stg (24.9858 a.m.u.), and 11.01% of 26Mg (25.9826 a.m.u.). Use these data to calculate the weighted average atomic mass of magnesium. WW5 o.a299(2392r00m-w) = lawmama 7*” M) OJoooCQMQYé’a‘W'MJ : Rf”? OW“! 2’6 M3 o,llol(?\fci316 Ohm-V“) F‘ 2- 3)“ am“ 114‘ 304} a.m.u. 5' It ‘M. 18. (8 pts) Give the chemical symbol for 2 4‘ 3 0 a m a) a nonmetal in Group iA H I “f r I)! 00 M-U‘. b) a metal in Group IVA En N‘ c) a metal that always forms a cation with 2+ charge (i.e., XZ”) BC 0 r m? 0 f' CA Q‘i't, d) ahalogen E gr Ci of gr) (ZR, 19. 20. 21. 22. CkQV‘N 5 ’91;ng iQ-Qf (4 pts) Report the volumes of liquid in each of these graduated cylinders, and report your answers with the correct number of significant figures. a) Mg3,N2 M 9 1' PLuS S |D& HT. QQVC! c) Cu(CN)2 Cglp'ggc (.112) clawed? d) N204 1" " c ,. .roKFcit‘ b) H3PO4(aq) (8 pts) PRINT the chemical formula for a) hydrobromic acid H. B l" b) iron (111) sulfate Flk’z C504 21 S. Fit Ba (0)422 c) silicon tetrafluoride d) barium hydroxide (6 pts total) a) (4 pts) Balance the following equation. _2_C6HHOH + _(Lo2 —> AGO; + _l_2_H20 b) (2 pts) Which term best describes this reaction type? (Please Circle your answer.) combination deCOmposition ...
View Full Document

Page1 / 5

177Exam1KeyF07 - PROF. THOMAS J. GREENBOWE DR. KATHY BURKE...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online