Chem 210 Exam 3 spring 2009

Chem 210 Exam 3 spring 2009 - ,éhem 210'4 Exam 3 Spring...

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Unformatted text preview: ,éhem 210 '4 Exam 3 - Spring 2009Name: FREE RESI'ONSE: Answer the following questions in the spaces provided. Show aiE work and express final answers wish the correct number of significant figures and units to receive full credit. If you use exponential notation for your answer, you must use proper scientific notation. h (5 poiats) Waier is heated from 223°C to 565°C. Express this AT in Keivin. 3 L! a a}. K 2. (5 points) What is the oxidation number of the chromium atom in {he chromate ion: Cr04z” '? it Q 3. (20 points} Consider the skeieton oxidatiomreduction reaction: + —— 3 Fe (aq) + C102 (aq) 9 Fe +(aq) “i” Che) A) Which species is the oxidizing agent in this reaciion‘? C i O; .4 8) Write the balanced net ionic equation for the reaction in acidic aqueous solution. [5/ Fa?“ M F& 3%, “355’ Qfl%\ >9 3 k, / «in ‘\“JRl"flMiMNNQ'NWWWWW'WWWU-M-«wwwvvww .. . ... {k- 5. 4. {15 points) A 50.0—mL sample of magnesium hyéroxéde soluiion is titrated with a 0‘33E M soiution of hydrochioréc acid, and 22.33 mL of {he acid is needed to reach the endpoint“ Cake-ulate the magnesium hydroxide concentration in the original sokutéon. I 5. (15 points) What mass of SO; (Iv;n & 80.07 g/moi) must react in order for 65.016 to be produced by the reaction below? SgCEgg) + 3 803(g) '9 SOC12(g) I + 4 802%} AH I “357.1 kJ Q “35’ fig 5 g ... MWWfiWWWWHwfiAVfigw , g vitrf;*uw"Q’L'9°E‘duR-WVWifi‘fi’iu4a‘fi‘é‘aflA‘MrfN/wwfiwfi'ym «rm www‘w-w ww x4 w w 6. {20 points) If 8.00 g of P4 and 15 .G g of C32 are piaced in a closed container and react by the equation below, calculate the mass of each ofthe three substances in the reaction vessek when the reaction has ended. (YOB may assume EGG % yieid and :10 side reactions.) ' ' P4(s) + 6 Chg} 9 4 PC13{g} Mm (g/mok): 323.9 70.90 {37.3 8, $33 35 £33. 7. (20 points) A LSD—g sampie of a hydrocarbon with the formula, CéHMG) (Mm 1“ 86.1? g/mol) is burned in a bomb calorimeter wifi) a heat capacéty of 865 JIC" that-contains 3.25 Egg. of water. The temperature of the apparatus increases fmm 210°C to 340°C. What is the AH vaEue for the reaction below as written? 2 C5H14G) + 19 02(g) '9 12 C02(g) + 14 H20 (g) ’m-«wwwv s BONUS: FEease answer the foitowing questions in the spaces provided. Credi: wili ooiy be given for a COMPLETELY correct answer. You must Show Work to receive credit. SQ» EEMR a}; 3.3wa E E‘K'EZEKL» mi. M3633»: erg. MAEEEEEEE 3 530$ ELELLBWE‘ (a points) Identify the sait produced' 1n the titration in question #4 and calceiate its coneentr (3 yams) A chemistry teacher pours 10.0 fioz. ofhot coffee (at 92.0 °C) into a mug at 21.0 °C and pours in 2.00 tablespoons of cream at 5.0 °C. The final temperature of the coffee drink in the cup is 73.0 °C. What is the heat capacity of the coffee cup? (Assume the density and specific heat for the coffee and cream are the same as that of water, and that no heat is lost to the environment.) “E” E- z EEEEXWZ"; .. E E 55E? :: EZE 5E efie ELE E3“? EEWEEEEEEE‘R {meg/EOE EEEEEE $3.33 M} E... g; {E3 EngQ‘E 37$”; W“ K“ “E“; (“K 3 E” 3 23:: he {E ...
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