WA. Homework 17

WA. Homework 17 - Detennine whether the thermodynamic...

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Unformatted text preview: Detennine whether the thermodynamic variable listed would be equal to zero[ posifive (greater than zero)[ or negafive (less than zero), in each of the following C3535. The correction marks Wlii not be shown for thlE question. Please look above at the score summary to determine your partial credit. a. AS for a reaction in which the products are more ordered than the reactants b. A5 for a substance undergoing a phase transition from gas to solid c. AH for a substance that is melting d. AG for a reaction which '5 extensive and spontaneoLB in the forward direction Use the data in textbook Table 9.2 (page 189) or the Bond Energy Resource in the on- line text to estimate the enthalpy change (AH) of the reaction: CzH2(9} + 2H2(9) —> CszlQ} -X E7307 k1 No Marks. To determine what portion of the quation you have correct, check quation score at the top of the assignment. Indicate whether each of the following would be more soluble in hexane (CsHm) or Water. Substance More soluble in HEY -’ EWater CsHls -’ EHexane -’ EHexane Consider the reaction below: Ayclls) + ZNHalakfl : A9(NH3}21+(3‘1)+ cll'taq) AH < n This question does not have any check marks, Be sure to look at your score after the first submission, a) What is Keq for the reaction? [A9(NH3)21+][C|1'] 1' [Mia]2 [Agcumualz f [A9(N+La)2“1[a"] [NH312 I [Ag(NHa)2“][cI"] ® [A9(NHa)z“HCI"] f [NHflzlAQCI] [Ag(NHs)21+] + [0"] I [NHa]+[NHa] b) Will the concentration of NH3 increase, decrease or stay the same when AgCl is added? increase decrease ® stay the same c) Will the concentration of NH3 increase, decrease or stay the same when Cl], is added? © increase decrease stay the same d) Will the concentration of NH3 increase, decrease or stay the same when heat '6 added? ® increase decrease An electrochemical cell has an E”ce|l of 1.30 V and transfers 1 mole of electrons. What is the value of delta 5? -X E7125 kJ/niol Glue the conjugate base or acid In each case. Enter subscnpts normally. Use a carat (Shlfi. 6) for superscnpts. For example, NH4“ would he entered as NH4"1+. The answers are case sansltlve, acid conjugate base HCID NH: He P04 H503 " - V EHZO-or- HOH - K EHSAL 52’ -EX ENHllAl-l- No Harks. To determine what portion of the quation you have correct, check quation score at the top of the assignment. Select the stronger base or acid in each pair (A or B). Note that CH3 and CH2 groups are electron donating groups, i.e., they place electron density on the atoms to which they are attached. Select the stronher base, Select the stronger acid Draw LeWis structure for ""03 and indicate all nonzero formal charges. Notes: - The browser may reposition the page the first time a bond is changed. - After the assignment has been submitted you should select the 'Refresh Drawmg' button before editing the lenis structure. - The encoded response is a comma separated list of the bond order for each bond, the number of lone pairs around each atom and the formal charge for each atom in an order starting at the top lelt and ITIO‘VIl'lg toward the bottom right. The encoded response is what is actually graded. instructions: 3 - To add lone pairs, click on the element symbol. - To add bonds, click on the yellow box between the element symbols. - To remove lone pairs or bonds click on the element symbol or bond until the desired value is displayed. - To indicate the formal charge, select the appropriate value from the pull down list. LeWis Structure: E] E FormalCharge: [1 : [1 : 2,1,1,1,2.3.0,2,D,0,- 1,1,0,0 Consider the experiment where Pb is added to a solution of Ni2+ a) In the balanced equation, what is the coefficient in front of Pb? I“ E: b) In the balanced equation, what is the coefficient in fi'ont of Nl2+? I" E: c) What is the reaction potential for this reaction? -’ E 0.10 V d) Is this reaction extensive? (yes or no) ." fine Consider the experiment where Cu is added to a solution acidic nitrate ion (look for a half reaction With nitrate) a) In the balanced equation, what is the coefficient in fi'ont of Cu? — a: b) In the balanced equation, what is the coefficient in front of N031"? _ E: c) In the balanced equation, what is the coefficient in front of H”?_ E d) What is the reaction potential for this reaction? _ Ewe: V e) Is this reaction extensive? (yes or no) _ Eyes No llarks. To determine what portion of the question you have correct, check question score at the top of the assignment. Use the Solubility rules on your exam hand-out to decide whether a precipitate would form when each of the followmg pairs of aqueous solutions are mixed: Use the link Solubility miles or Table 10.2 on page 235 of your textbook. NazCrO4 + NH4CI .J EM: Na2504 + CoClz .V EM: Potassium Bromide and SilverlI) Nitrate .’ EYes Sodium Hydroxide + CopperUI) Sulfate .V EYes Home MyAssignments ...
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This note was uploaded on 01/24/2010 for the course CH Ch101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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WA. Homework 17 - Detennine whether the thermodynamic...

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