page 1143copy02/11/06expiration:CHEM 1120 test 3 spring 2004Circle the letter of the correct answer on the answer sheet.1) From bond energies calculate the )H for the following reaction:2CH3CH2OH(g) + 5 O2(g) ! 4 CO2(g) + 4 H2O(g)-383e)-4143d)-1158c)-579b)1158a)2) Calculate the slope and intercept for the van't Hoff plot for the reaction:2SO2(g) + O2(g) ! 2SO3(g) R = 8.314 J mol-1 K-14H 10-2.38slope =b)1H 107.98slope =a)22.61intercept =-22.61intercept =2H 10-1.98slope =d)2H 101.98slope =c)-188.00intercept =-188.00intercept =4H 102.38slope =e)-22.61intercept =Some interesting equations:C = -kt + Co ln(C) = -kt + ln(Co) +1/C =+kt +1/Co3) The following are some initial rates for the chemical reaction:H2C=CH2 + Cl2 ! H2ClC-CCl2rateP(Cl2)P(H2C=CH2)2.08 H 10-3atm0.25atm0.502.08 H 10-3atm0.25atm1.004.16 H 10-3atm0.50atm1.00What is the rate constant and what are the orders of the reaction?H 10-34.16c)H 10-38.32b)H 10-32.08a)order for HC=CH1order for HC=CH1order for HC=CH1page 2143copyCHEM 1120 test 3 spring 20044) The following is some kinetic data for the amount of a reactant left versus time. What is the rate constant for the reaction?percent of reactant left/stime100%057.7%1033.3%2019.2%3011.1%406.4%50s-10.550e)s-11.260d)s-19.942c)s-10.055b)s-10.033a)years. How long would it take for a to decay705) The half life for a nuclear decay isof the original sample is left?34%enough so that onlyyr24e)yr34d)yr52c)yr76b)yr109a)s-1.1H 105.666) The rate constant for a first order reaction is What is the half life?s-1.0H 105.66c)s-1.-2H 101.22b)s-1.1H 105.66a)s-1.-2H 101.77e)s-1.1H 103.92d)7) The following is a series of elemental reaction steps, what is the expected observed reaction order(s)?step 1: SO3 + H2 ! HSO3 + H@ slow step step 2: HSO3 + H2 ! SO2 + H2O + H@ a fast stepstep 3: 2H@ ! H2 a fast stepoverall: SO3 + H2 ! SO2 + H2Opage 3143copyCHEM 1120 test 3 spring 20048) The following is a series of elemental reaction steps, what is the expected observed reaction order(s)?step 1: H2 º 2H@ fast stepstep 2: H@ + N2 ! HN + N@ slow stepstep 3: H2 + N@ ! HN@ + H@ fast stepstep 4: H2 + HN@ ! NH3 fast stepin NH3-1in N2 and order1.0in H2, order0.5ordera)in NH3-1in N2 and order1.0in H2, order1.0orderb)in NH30in N2 and order1.0in H2, order1.0orderc)in NH30in N2 and order1.0in H2, order1.5orderd)in NH30in N2 and order1.0in H2, order0.5ordere)9) The reaction: H3CNC ! H3CCN is first order in H3CNC. From the following dataCalculate the half life for this reaction.moles of H3CNCtime /days.197011610682040302340yr13.0e)yr9.0d)yr18.8c)yr18.0b)yr6.5a)10) The equation: C/Co = e-kt is a form of which integrated rate equation?in the reactant0.5a) the equation of orderin the reactant0.0b) the equation of orderin the reactant2.0c) the equation of orderin the reactant1.0d) the equation of orderin the reactant3.0e) the equation of orderpage 4143copyCHEM 1120 test 3 spring 200411) A reaction has an activation energy of 50.0 kJ mol-1 of reaction. If the rate constantR = 8.314 J mol-1 K-1oC?37M hr-1, what is its value at6.30at 25 oC isM hr-16.88a)M hr-119.08b)M hr-119.86c)M hr-19.54d)M hr-113.77e)F = 96 487 C mol-1E = Eo - (0.0592/n) log Q12) Calculate the mass of chromium which will plate out after 8.00 hours if the amountamps. The reaction is Cr3+ + 3e- ! Cr(s)67.6of current used is g3e)g3148d)g350c)g525b)g1049a)13) How many minutes would it take to plate out 50 g of gold if at a constant current ofThe reaction is: Au(CN)- + 1e- ! Au + 2CN-A?10.040.8e)20.4d)633.6c)204.9b)102.4a)14) What is the standard potential for the cell: Pb | PbSO4 | H2SO4 | PbSO4 | PbO2 | Pt ?V-1.329e)V1.998d)V2.041c)V-2.041b)V1.329a)15) What is the potential (E not Eo) for the cell: Zn(s) | Zn2+ (0.20 M) | | Cu2+ (0.01 M) | Cu(s)?page 5143copyCHEM 1120 test 3 spring 200416) What is the standard potential for the hydrogen electrode?V1.5700e)V1.6850d)V0.0000c)V0.4010b)V-0.1263a)17) In the following cell, what species are compose the anode in its entirety? Pb | PbSO4 | H2SO4 | PbSO4 | PbO2 | Pt ?a) Pb, PbSO4 and H2SO4b) PbO2, PbSO4 and H2SO4c) PbO2, Pb and H2SO4d) PbO2 and Pbe) PbSO4 and H2SO418) In the following cell, what species are the parts of the reduction reaction? Pt | O2 | H3O+ |H2 | Pt ?a) O2 and H3O+b) Pt, O2 and H3O+c) H2 and H3O+d) O2, H2 and H3O+e) Pt, O2, H2 and H3O+19) Calculate the potential (E not Eo) for the following cell:M) | Cu(s)0.287M) | | Cu2+ (1.53Cu (s) | Cu2+ (V0.0215e)V-0.1578d)V5.3310c)V0.0000b)V-0.0215a)20) Calculate the potential (E not Eo) for the following cell:) | Zn(s)1.820) | | Zn2+ (1.820Zu (s) | Zn2+ (KEY143copy02/11/06expiration:CHEM 1120 test 3 spring