6 Among these compounds, which one is most likely to exhibit covalent bonding?

(A)Rb₂S

(B)SrCl₂

(C)CS₂

(D)CaO

(E)MgI₂

7 Among these pairs of atoms, which one would likely form the most polar bond?(A)B-C(B)C-N(C)C-O(D)Si-O(E)C-C

8 Among these compounds, which one is most likely to exhibit ionic bonding?(A)NCl₃(B)BaCl₂(C)CO(D)SO₂(E)SF₄

9 Which of the following molecules possesses tetrahedral geometry?(A)XeF₄(B)BF₃(C)AsF₅(D)CF₄(E)NH₃

10 How many atoms are present in a body-centered cubic unit cell?(A)1(B)2(C)3(D)4(E)8

11 In a face-centered cubic lattice of a metal, each atom is surrounded by how many nearest neighbors (atoms in contact)?(A)4(B)6(C)8(D)10(E)12

12 Given that the molar heats of sublimation and fusion of iodine are 62.3 kJ/mol and 15.3 kJ/mol, respectively, calculate the molar heat of vaporization of liquid iodine.(A)77.6 kJ/mol(B)47.0 kJ/mol(C)-47.0 kJ/mol(D)-77.6 kJ/mol(E)7.76 kJ/mol

13 Which of the following statements is false according to Raoult's law?(A)The vapor pressure of a solvent over a solution decreases as its mole fraction increases.(B)The solubility of a gas increases as the temperature decreases.(C)The vapor pressure of a solvent over a solution is less than that of pure solvent.(D)The greater the pressure of a gas over a solution the greater its solubility.(E)Ionic solutes dissociate in solution causing an enhancement of all colligative properties.

14 Among these 0.10 M solutions, which one will have the lowest pH?(A)HCN(B)HNO₃(C)NaCl(D)H₂CO₃(E)NaOH

15 Arrange the acids HOCl, HClO₃, and HClO₂ in order of increasing acidity.(A)HOCl＜HClO₃＜HClO₂(B)HOCl＜HClO₂＜HClO₃(C)HClO₂＜HOCl＜HClO₃(D)HClO₃＜HOCl＜HClO₂(E)HClO₃＜HClO₂＜HOCl

16 At constant T and P, a negative sign for ΔG indicates that(A)the reaction is exothermic.(B)the reaction is endothermic.(C)the reaction is fast.(D)the reaction is spontaneous.(E)ΔS must be＞0.

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