Fall_2004_Midterm_Solutions

Fall_2004_Midterm_Solutions - Page 3 of 7 Print Name:...

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Unformatted text preview: Page 3 of 7 Print Name: Section A. Multiple choice. [ 4 points each] Circle the Correct answer or answers to the questions numbered 1 through 4. 1. Diamonds are measured in carats. A carat is 0.200g. The density of diamond is 3.51 g/cm3. What is the volume of a 5.0 carat diamond? a. 1.00 cm3 b. 0.7O2cm3 W4“ * 42-173 ~“ o-W d. 17.55 cm3 ’ [76“ I - 3/ e. 100 cm3 World’s Smallest Abacus: Each row has 10 C60 molecules. 2. The image is ofthe smallest abacus, made by positioning Cm molecules using an STM. Each dot is one C60 molecule. How many electrons are present in the bottom row of the abacus? a. 60 @ (De; (eocmwmmflto MW) e. 360 d. 180 e. 600 Page 4 of? Print Name: 3. A reaction ofone liter of chlorine gas (C12) with three liters of fluorine gas ( F3 ) yields 2 liters of gaseous product. All gasses are at the same temperature and pressure. The gaseous product is: a. chlorine monoflouride b. chlorine pentaflouride @ (3&2, fim mm d. ClF bgdl QHPT 2) e. cannot determine 4. Which ofthe following sets of elements have very similar chemical properties: Page 5 of 7 Print Name: Section B. [ 8 points ] Circle the correct choice A particular bottle holds 3.6 kg of I1H30. Ifit is filled instead with the same volume of 31H30, how many kg olel-lgO will it hold? 2 62027“ MMIHW Wmdtfii”_fo 8Q}; '5 a. 3.6kg [P41 IQ: 19,12 ‘ "I b. 4.0 kg Lem” we’ll; 3. Moan “0‘23 m 040 “m Ail-'21 w" 4‘66 ‘6 507°! T am? .004, ihmu low M ital/1W «Al-L a d- Ombkg 3 it 91) mfluuzu) Mull mm w/I 0‘” 20% e. cannot determine W W K M . 01mm. W 11‘4"“ l Tm” b L" l” Section C. 1 5 points ] W CUM WHEN Complete the table. Indicate atom 0 number and mass with the element symbol. c. 0.36 kg Page 6 of 7 Print Name: Section D. [ 7 points ] Complete the table. H chloric acid I P 0 bl. PhoSPkorau’g 2 5 Pml—on'dt MOCLCUJ ax \ Section E. [ 6 points ] Write the formulas for the following compounds 1. sodium oxide N32 0 2. copper (II) nitrate CM' (N03); 3. diphOSphorous trioxide P103 4. nitrous acid HNOZ Gr HONO 5. gallium arsenide blah-AS 6. lead( 1v ) sulfide PloS2 Page 7 of? Print Name: Section F. [ 8 points ] Please Show your work clearly. A sphere of gold (density = 10.5 g/cm3) weighs 42. g. It is melted. and cast into a rectangular card of width 8.00 cm and length 0.8504 cm. What is the thickness of the card? [volume = (length)(width)(thickness)] . mass dMSl‘i'%—— Volume) 10.5 S/WS :- (8. oo m)(o.95040vw3 (/C W) 1+ ...
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This note was uploaded on 02/20/2012 for the course CHEM 101 taught by Professor Any during the Fall '08 term at Northwestern.

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Fall_2004_Midterm_Solutions - Page 3 of 7 Print Name:...

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