Fourth Exam Form A Key 1 A 2 B 3 B 4 C 5 B 6 C 7 E 8 A 9 A 10 C 11 B 12 E 13 C6H12 14 C4H8O sodium ion 1 0 M sulfate ion 0 5 M 15 yes or no chemical formula a no none b yes Cr2S3 c yes BaSO4 16 2 Fe3 aq 3 CO32 aq Fe2 CO3 3 s 17 2 C5H6NO2 13 O2 10 CO2 6 H2O 2 NO2 18 3 I2 s 2 Al s 6 I1 aq 2 Al3 aq Eo 2 20 V 19 a O H2C H b carbon atom CH2 O H2 C CH2 H 1 Which of the following substances would be most soluble in water A CH3OH B CH3 CH2 8NH2 C AgCl D CH4 2 Consider the following five substances How many of them would be strong electrolytes i CH3Br ii C2H6 iii H2O iv NaOH v CrCl3 A one B two C three D four E all five 3 When dissolving these solids in water note their values of Ksp which is the best statement CaF2 Ksp 4 x 10 11 BaF2 Ksp 1 x 10 6 PbF2 Ksp 3 x 10 8 A BaF2 produces the fewest fluoride ions while PbF2 produces the most fluoride ions B CaF2 produces the fewest fluoride ions while BaF2 produces the most fluoride ions C BaF2 produces the fewest fluoride ions while CaF2 produces the most fluoride ions D CaF2 produces the fewest fluoride ions while PbF2 produces the most fluoride ions E PbF2 produces the fewest fluoride ions while CaF2 produces the most fluoride ions 4 In which of the following is a sulfur atom in the 4 oxidation state A H2S B H2SO4 C H2SO3 D H2S2O3 E H2S2O4 5 Consider the energy diagram on the right for the chemical species G and J Which of the following reactions would be extensive E A G J G2 J2 B G2 J G J2 C G2 J G J2 D Both A and B E Both B and C J G 6 In the question above which is the best oxidizing agent A G B J C G2 D G2 E J2 7 Which of the following unbalanced processes is a four electron oxidation A CO CH3OH B PH3 P C NO NH3 D ClO2 ClO1 E 2 H2O O2 8 A galvanic electrochemical cell is constructed using the Zn2 Zn and Pb2 Pb half reactions What reaction takes place at the anode A Zn Zn2 2 e1 C Pb Pb2 2 e1 B Zn2 2 e1 Zn D Pb2 2 e1 Pb 9 What is the oxidizing agent in this reaction H2N2O2 OH1 Pb N2 HPbO21 H2O A H2N2O2 B OH1 C Pb E HPbO21 D N2 10 Consider the Co2 Co redox couple which has a reduction potential of 0 28 V Select the best statement regarding the strengths of Co2 and Co A Co2 is a stronger oxidizing agent than Sn2 while Co is a stronger reducing agent than Zn B Co2 is a stronger oxidizing agent than Zn2 while Co is a stronger reducing agent than Fe C Co2 is a stronger oxidizing agent than Al3 while Co is a stronger reducing agent than Cu D Co2 is a stronger oxidizing agent than Fe3 while Co is a stronger reducing agent than Ag 11 In the molecule shown which atom is most likely to act as a Lewis acid A oxygen 1 B carbon 2 C carbon 3 D nitrogen 4 1 O O H C C H 2 3 N 4 H CH2 H O H 12 Which statement most accurately describes a Lewis acid base reaction A Each reactant contributes one electron to form a new covalent bond B A positive ion and negative ion come together to form a new ionic bond C The Lewis acid provides two electrons to form a new covalent bond D The Lewis acid provides two electrons to form a new ionic bond E The Lewis base provides two electrons to form a new covalent bond PLACE YOUR ANSWERS FOR 13 19 DIRECTLY ON THIS EXAM 13 5 each In the spaces below write the chemical formula for each of the molecules O 14 4 each What is the concentration of each ion in a 0 50 M solution of sodium sulfate sodium ion sulfate ion 15 18 For each combination of 0 1 M aqueous solutions listed state yes or no whether a precipitate will form IF YES then provide the chemical formula of the solid IF NO write None for chemical formula a V NO3 2 and Cu C2H3O2 2 b Cr ClO4 3 and K2S c Ba NO3 2 and Li2SO4 yes or no chemical formula a b c 16 10 Write a balanced net equation for the reaction that occurs when 0 1 M aqueous solutions of FeCl3 and K2CO3 are mixed be sure to include states of matter for this question 17 10 Write a balanced equation with integer coefficients for the complete combustion reaction of C5H6NO2 For this question you do not need to show states of matter 18 10 Write a balanced net equation for the reaction that occurs when I2 is mixed with Al Assume the presence of water so aqueous ions can be formed be sure to include states of matter for this question 4 What is the potential of this reaction V 19 a 8 Diagram the following reaction using curved arrows to indicate electron movement Lone pairs are not shown but may need to be taken into account in your diagram O H2C CH2 H O H2C CH2 H b 2 Based on your diagram which atom acts as the Lewis acid circle one carbon atom oxygen atom
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