CHEMISTRY

25. The molecular structure of the IO3 ion is best described as:

a. bent or angular.

b. trigonal planar.

c. trigonal pyramidal.

d. trigonal bipyramidal.

e. T-shaped.

 

26. The electron domain geometry of the AsF6 ion is octahedral.  The hybrid orbitals used by the As atom for bonding are:

a. sp2

b. sp3d

c. sp

d. sp3d2

                e. sp3

 

27. The F-B-F bond angle in BF3 is ____________.

a. 60°

b. 90°

c. 109.5°

d. 120°

e. 180°

 

28. The geometry associated with sp hybridization is:

a. linear

b. octahedral

c. trigonal biplanar

d. trigonal planar

e. tetrahedral

 

29.  Which series of elements is arranged in order of increasing electronegativity?

a. C, Si, P, As, Se

b. O, P, Al, Mg, K

c. Na, Li, B, N, F

d. K, Mg, Be, O, N

e. Li, Be, B, C, Ca

IMF’s

Use the following to answer questions 30-32:

Consider the representations below to answer the next three questions.

(I)

(II)

(III)

 

30.     How many of the following statements are correct concerning drawing I?

 I. Each molecule induces a dipole onto the next molecule in close proximity.
II. The phenomenon shown is relatively weak and short-lived.
III. All nonpolar molecules contains this type of interaction.
IV. The forces that exist in this example are London dispersion forces.

 

a)       0

b)       1

c)       2

d)       3

e)       4

 

31.     Which drawing best represents the interactions in a sample of HF?

a)       I

b)       II

c)       III

d)       I, II

e)       all of the above

32.     Which of the following statements are incorrect concerning drawing III?

a)       Electrostatic interactions exist between the molecules.

b)       The molecules find the best compromise between attraction and repulsion.

c)       These molecules exhibit ionic bonding.

d)       CHCl3 exhibits this type of interaction.

e)       Two of the above statements are incorrect.

 

33.     Which of the following is the correct order of boiling points for KNO3, CH3OH, C2H6, Ne?

a)       Ne < CH3OH < C2H6 < KNO3

b)       KNO3 < CH3OH < C2H6 < Ne

c)       Ne < C2H6 < KNO3 < CH3OH

d)       Ne < C2H6 < CH3OH < KNO3

e)       C2H6 < Ne < CH3OH < KNO3

 

34. What is the strongest intermolecular force (IMF) found in a sample of thousands of C2H6 molecules?

a.       London          b. dipole dipole          c. nonpolar          d. H bond force        e. polar

35. What is the strongest intermolecular force (IMF) found in a sample of thousands of HBr molecules?

a.London          b. dipole dipole          c. nonpolar          d. H bond force        e. polar

36. What is the strongest intermolecular force (IMF) found in a sample of thousands of He atoms?

a. London          b. dipole dipole          c. nonpolar          d. H bond force        e. polar

37. What holds the N atom to the H atom in a molecule of ammonia, NH3?

a.Ionic bond          b. polar bond         c. H bond          d. nonpolar bond         e. dipole dipole

38. What holds the molecules together in a sample of ammonia, NH3?

a.       Dipole dipole forces          b. polar bonds         c. H bond forces         d. London forces

39. What holds the O atoms to each other in a molecule of oxygen gas?

a.       Ionic bond          b. polar bond         c. H bond          d. nonpolar bond         e. dipole dipole

40. As intermolecular forces increase, which of the following decreases?

a.       Surface tension        b. Boiling Point          c. Vapor Pressure          d. Melting Point          e. Viscosity

41.Which is true when comparing samples of C6H6(l) (has C-H bonds) to C2H5OH(l) (has an O-H bond)?

a    The vapor pressure of C2H5OH is higher.

b.      The boiling point of C6H6 is higher.

c.       The surface tension of C2H5OH is lower.

d.      The melting point of C2H5OH is lower.

e.      The viscosity of C6H6 is lower.

 

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