Fourth Exam Form B Key 1 B 2 A 3 D 4 B 5 E 6 E 7 D 8 B 9 A 10 D 11 D 12 A 13 C7H14 C4H11N 14 potassium ion 0 40 M carbonate ion 0 20 M 15 yes or no chemical formula a yes Ni OH 2 b yes PbI2 c no none 16 3 Co2 aq 2 PO43 aq Co3 PO4 2 s 17 2 C4H8O2S 13 O2 8 CO2 8 H2O 2 SO3 18 Cu s 2 Fe3 aq Cu2 aq 2 Fe2 aq Eo 0 43 V 19 a Cl CH2 Cl CH2 b Cl2 Cl Cl H2 C CH2 1 Which of the following substances would be most soluble in water A CH3 CH2 10OH B HF C C2H6 D FeS 2 Consider the following five substances How many of them would be strong electrolytes i C6H14 ii CH4 iii NH3 iv CH3OH v NaCl 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 CaF2 produces the most fluoride ions B CaF2 produces the fewest fluoride ions while PbF2 produces the most fluoride ions C PbF2 produces the fewest fluoride ions while CaF2 produces the most fluoride ions D CaF2 produces the fewest fluoride ions while BaF2 produces the most fluoride ions E BaF2 produces the fewest fluoride ions while PbF2 produces the most fluoride ions 4 In which of the following is a sulfur atom in the 6 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 G J2 G2 J D Both A and B E Both B and C J G 6 In the question above which is the best reducing agent A G B J C G2 D G2 E J2 7 Which of the following unbalanced processes is a three electron oxidation A ClO2 ClO1 B 2 H2O O2 C CO CH3OH D PH3 P E NO NH3 8 A galvanic electrochemical cell is constructed using the Sn2 Sn and Fe2 Fe half reactions What reaction takes place at the cathode A Sn Sn2 2 e1 C Fe Fe2 2 e1 B Sn2 2 e1 Sn D Fe2 2 e1 Fe 9 What is the oxidizing agent in this reaction HPO32 H2O I1 H2PO21 IO1 OH1 A HPO32 B H2O D H2PO21 C I1 E IO1 10 Consider the SbO1 Sb redox couple which has a reduction potential of 0 21 V Select the best statement regarding the strengths of SbO1 and Sb A SbO1 is a stronger oxidizing agent than Cu2 while Sb is a stronger reducing agent than Ag B SbO1 is a stronger oxidizing agent than Ag1 while Sb is a stronger reducing agent than Ni C SbO1 is a stronger oxidizing agent than Sn2 while Sb is a stronger reducing agent than Zn D SbO1 is a stronger oxidizing agent than Mg2 while Sb is a stronger reducing agent than Br1 11 In the molecule shown which atom is most likely to act as a Lewis base A hydrogen 1 B carbon 2 C carbon 3 D nitrogen 4 1 O O H C C H 3 N 4 H CH2 H 2 O H 12 Which statement most accurately describes a Lewis acid base reaction A The Lewis base provides two electrons to form a new covalent bond B Each reactant contributes one electron to form a new covalent bond C A positive ion and negative ion come together to form a new ionic bond D The Lewis acid provides two electrons to form a new covalent bond E The Lewis acid provides two electrons to form a new ionic 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 N 14 4 each What is the concentration of each ion in a 0 20 M solution of potassium carbonate potassium ion carbonate 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 Ni NO3 2 and LiOH b NaI and Pb NO3 2 c AgClO4 and Fe NO3 2 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 Co NO3 2 and Na3PO4 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 C4H8O2S 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 Cu is added to an aqueous solution of Fe3 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 Cl CH2 Cl CH2 Cl Cl H2 C CH2 b 2 Based on your diagram which reactant is the Lewis acid circle one Cl2 C2H4
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