Chem 210 spring 2009 Exam 2 (2)

Chem 210 spring 2009 Exam 2 (2) - Name Kev 5 Section II B...

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Unformatted text preview: Name: Kev 5 Section: II): B CHEM 216 ~ Spring 2009 - Exam #2 Short Answer I . (6 points) What are the concentrations of chromium (III) ions and sulfate ions in a 0.50 M Chromium (Iii) sulfate solution? [creel 2 1.0 H £5533”; /' S” U. 2. (2 points) Spell A.}.’s favorite word in chemistry: 5 h 3‘ LL»; 0 (Note: It describes the calcutations of chemical} quantities in reactions based 0 ole ratios.) Multiple Choice (5 points each) IdEHrifiz the choice that best completes the statement or answers the question. 2_ 3. A 1-1. botfie of a 3.33 M stock solution of NaBr is provided in the iaboratory. If a procedure cails for you to prepare 500. mL of a 0.125 M NaBr sotution, what voiume of the stock soiution wilt be required? A) 208 1311. B) 12.5 mL C) 62.5 311. D) 18.8 mL E) none of these 4. Selenic Acid has the formula H25‘BO4. What is the formula for potassium selenite‘? A) KgSeO-z B) [(23604 C) 51286203 D) K8204 'E) KSeOa E 5. What voiume of 0.1M)? MNaOI-I contains 10.0 g of NaO-H (Mm 2 40.00 g/mol)? A) 0.729 I. 3). m1 L- C) 4.43 L D) 3.20 L B) 2.26 L ME” 6. What is the mess percent of NaCi in a solution prepared by mixing 15.0 g of NaCI with 90.0 g of water? A) 15.0 % B) 14.3 % C) 85.? % D) I67 % E) E83 % 'w'awm-vw w'wwvvw x4 Chemistry 21.0 - Exam 2 Name: K 41:} Section: SPRING 2009 FREE RESPONSE: Answer the following questions in the spaces provided. Show all work and express final answers with the correct number of significant figures and units to receive foil credit. if you use exponentiai notation for your answer, you must use proper scientific notation. 7. (12 points) Provide the names or formulas of the following compounds: M303th ELLA ” k0 wt ammonium suifite H SO3 i Ying‘gfi hypochlorous acid ZnBr2 :E‘iVKC, lead (IV) hydroxide 6 ii ’54 8. (20 points) Write complete, balanced equations for the following chemical reactions. Be sure to include state symbols. If no reaction is expected, write NR anci briefly expiain why. A) :5 KOHW + ngoflaq, —> 3 HO gm) 4—. L3?0 B) 1310(5) + WAIClflaq) ‘9 ) :5 111M (CF-<} C) MTBE, a former gasoiine additive with the formula, C5HHOU;, is burned. é Cgi‘ihqfli (is Cali-«9 19 C016 1% 1%.qu {3) Lithium metal reacts with oxygen in the air. Li LL“) 4r (3;.L we; LL}O (1:33 {3) 9. (7 points) Write the moiecuiar and net ionic equations for the reaction of aqueous iron (1H) sulfate with magnesium metal. MOLECULAR: 3 wee} 3:;”} 5%“ Reg; 10. (10 points) An unknown compound contains only carbon and hydrogen. When a LEGO—g sampie of the compound is analyzeci, it is found to contain 1.358 g Carbon. The molar mass of the compound was determined to be approximately 210 g/ moi in a separate experiment What are the empirical and molecular formulas of the compound? NWMMiwwNWWN-“Wwvv-«ww 11. (8 points) Consider the reaction of tungsten (VI) oxide with hydrogen gas to form free tungsten meta}. What mass of hydrogen gas Wilt be required to futiy react with 425 g of tungsten (VI) oxide? WOME) + 3 Hgg} 9 WW + 3 H20“) Mote}: masses (g/ moi): ? W 2 183.84 «5.153 mg: . woa = 231.84 H2 : 2.02 H20: 18.02 12. (15 points) In the lab a student mixes a solution containing 5.00 g sodium sulfide with a solution containing excess aqueous iron (III) nitrate and a precipitate forms. If the reaction typically proceeds with a 70.0 % yield, what mass of the soiid product can the student expect to have when it is isolated? ieeegjme 2e? . skew? 3mg metmegfi we was; 5 g NmoE Slot)- . . t, . - 3 - We?» meet AWE» S“ {33:} BONUS: (3 points) Under an atmosphere of fluorine gas (no oxygen present), the compound Cal-1;]ng wilt bum in (react with) the fluorine gas to give only C134, HF, NE, and SFéi What is the baianced chemical equation for this reaction? 5% z i i 5‘ ; {New .. , , _ _ 23C g it; N 5g:a?3f¥i Wigjesfl zfiise’ i we egg-e ...
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Chem 210 spring 2009 Exam 2 (2) - Name Kev 5 Section II B...

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