Chem 210 spring 2009 Exam 2 (4)

Chem 210 spring 2009 Exam 2 (4) - Name K8” 5 Section ID D...

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Unformatted text preview: Name: K8” 5 Section: ID: D CHEM 210 - Spring 2009 —- Exam #2 Short Answer 1. 2. (2 points) Spell AJIS favorite word in chemistry: 2 file '1 ka l ¢M&*T§ (Note: It deecribes the calculations of chemical quantities in reactions based on Io ratios.) (6 points) What are the concentrations of chromium (III) ions and sulfate ions in a 0.50 M chromium (IKE) sulfate solution? [C(3+1 :: L G M {503*} :2 I. 5‘ 53 Multiple Choice (5 points each) 7 -_ Identtfy the choice that best completes the statement or answers the question. D“ 3. in)“ 4. What volmne of 0.1107 M NaOH contains 10.0 g of NaOH (Mm : 40.00 g/moi)? A) 3.20 L B) 4.43 L C) 1.11 L D) 2.26 L E) 0.729 L A 1~L bottle of a 3.33 M stock soiution of NaBr is provided in the laboratory. If a procedure cails for you to. prepare 500. mL of a 0.125 MNaBr solution, what volume of the stock solution will be required? A) 208 mL ' " B) 12.5 mL C) 62.5 mL D) 18.8 mL E) none of these . Seieni-c Acid has the formula steot. What is the formula for potassium seienite? A) K2 3604 B) 19560;; _ = C) K23603 D) KSe03 E) K5604 . What is the mass percent of NaCl in a solution prepared by mixing 25.0 g of NaCl with 90.0 g of water? A) 18.3 % B) 14.3 % C) 85.7% D) 15.0% E) E6.7% Chemistry 210 0 Exam 2 Name: Kg“ 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 fuli credit. If you use exponential notation for your answer, you must use proper scientific notation. 7. (12 points) Provide the names or formulas of the following compounds: hypochlorous acid H O ZnBr2 ? (23 Mt ammoriium sulfite Hg ’ 3 Nisfll’OQ2 ' {gm H ' k6 3 l‘o—‘i’t ' a lead (EV) hydroxide “P E f O i 803 S ix )‘gmifii-‘L 8. (20 points) Write complete, balanced equations for the following chemical reactions. Be sure to inctucte state symbols. If no reaction is expected, write NR and briefly explain Why. A) 3 Home) + mean?) 3) AIC13(aq)+ meal-s}? IQ A1 MOVE erc§fiV9L Mm, C) MTBE, a former gasoline additive with the formula, Cfifiuom, is burned. =52 Cf; 3-}0 *JECD‘MS) COJSX+ I Q. Hyég i3) Lithium metal reacts with oxygen in the air. L! bis} + DAL “ha 02 LLQOCS) 3 ._........._, 9. (7 goints) Write the molecular and net ionic equations for the reaction of aqueous iron (III) suifate with magnesium metal“ MOLECULAR: 10. (10 points) An unknown compound contains oniy carbon and hydrogen. When a 1.500~g sample of the command is analyzed, it is found to contain 1.358 g Carbon. The molar mass of the compound was determined to be approximately 210 g/ mol in a separate experiment. What are the empirical and moiecular fonnulas of the compound? Cow-Pod 11. (8 points) Consider the reaction of tungsten (VI) oxide with hydrogen gas to form free tungsten metal. What mass of hydrogen gas will be required to fully react with 325 g of tungsten (Vi) oxide? “103(5) + 3 Hag) 9 WM + 3 320m Molar masses (g/ mol): , A} g y w a 183.84 N we M" ‘ wog 3 231.84 5‘ H2 2 2.92 Hzom 18.02 12, (15 points) In the lab a student mixes a solution containing 5.00 g sodium sulfide with a solution contamng excess aqueous iron (HI) nitrate and a precipitate forms. if the reaction typically proceeds with a 758% field, What mass of the solid product can the student expect to have when it is isolated? W “la/wk zeaanalmx 3Nq35 +2hfi~o3§3 --> Fags“; é NaNog, 5:003 T927 aobe’cq Ax):7 an: a”; 500 .L 3 lest :4 9‘3 lw’?‘ Fewa an 31 j» q Lilia) F1953 14: 04314.7.) Ema blacks has 112,53 ® Selffig 7‘: ole-SQ :1: {1 3}“ 31‘ fig? j w :' e13 * . 2.: e BONUS: (3 points) Under an atmosphere of fluorine gas (no oxygen present), the compound QBBNSQ will burn in (react with} the fluorine gas to give only CF,“ HF, N33, and SEE. What is the balanced chemical equation for this reaction? i Cgi‘égggg‘géfi”? 2:; “Wei (:2 egg gigs: gifisg saggy ...
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This note was uploaded on 09/19/2011 for the course CHEM 51423 taught by Professor Martinovic during the Spring '10 term at Skyline College.

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Chem 210 spring 2009 Exam 2 (4) - Name K8” 5 Section ID D...

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