Deck 8: Molecular Shape and Structure: Life in Three Dimensions

Question 1

Which of the following statements is true?

A) The atomic radius is the distance between two covalently bonded atoms of the same element.
B) The atomic radius is half the distance between two covalently bonded atoms of the same element.
C) The atomic radius is the distance between two covalently bonded atoms of different elements.
D) The atomic radius is half the distance between two covalently bonded atoms of different elements.
E) The atomic radius is the distance between two ionically bonded atoms of the same element.

Answer 1

B

Question 2

Place the following bonds in order of relative length, with 1 being the shortest and 3 being the longest.

Answer 2

a. Single bond = 3
b. Double bond = 2
c. Triple bond = 1

Question 3

A tetrahedral geometry typically exhibits which of the following bond angles?

A) 90 $\degree$
B) 180 $\degree$
C) 109.5 $\degree$
D) 106.5 $\degree$
E) 120 $\degree$

Answer 3

109.5 $\degree$

Question 4

A trigonal bipyramidal geometry exhibits two characteristic bond angles. Which bond angles are these?

A) 90 $\degree$
B) 109.5 $\degree$
C) 120 $\degree$
D) 180 $\degree$
E) 45 $\degree$

Question 5

Match the number of valence electron pairs with the type of geometry that they typically exhibit.
-Tetrahedral

A) 4
B) 3
C) 2
D) 6

Question 6

Match the number of valence electron pairs with the type of geometry that they typically exhibit.
-Trigonal planar

A) 5
B) 4
C) 3
D) 7

Question 7

Match the number of valence electron pairs with the type of geometry that they typically exhibit.
-Linear

A) 6
B) 5
C) 4
D) 8

Question 8

Match the number of valence electron pairs with the type of geometry that they typically exhibit.
-Octahedral

A) 7
B) 6
C) 5
D) 9

Question 9

Match the following geometries with the type of hybridized orbital that exhibits each geometry.
-Linear

A) sp
B) sp²
C) sp³

Question 10

Match the following geometries with the type of hybridized orbital that exhibits each geometry.
-Trigonal planar

A) sp
B) sp²
C) sp³

Question 11

Match the following geometries with the type of hybridized orbital that exhibits each geometry.
-Tetrahedral

A) sp
B) sp²
C) sp³

Question 12

The 'R' in VSEPR theory denotes which the following words?

A) Resonance
B) Repulsion
C) Redistribution
D) Radius
E) Relationship

Question 13

Which of the following are taken into account when applying VSEPR theory? Select all that apply.

A) Sigma-bonding pairs
B) Pi-bonding pairs
C) Anti-bonding pairs
D) Non-bonding pairs
E) Unpaired valence electrons

Question 14

Which of the following statements about non-bonding pairs is true?

A) Non-bonding pairs increase the typical bond angles associated with a particular geometry as predicted by VSEPR theory.
B) Non-bonding pairs decrease the typical bond angles associated with a particular geometry as predicted by VSEPR theory.
C) Non-bonding pairs have no effect on the typical bond angles associated with a particular geometry as predicted by VSEPR theory.

Question 15

Bond rotation is possible about which of the following types of covalent bond?

A) Single bonds only
B) Double bonds only
C) Triple bonds only
D) None of these
E) Single bonds and double bonds

Question 16

Which of the following statements are false? Select all that apply.

A) sp³ hybridization generates three sp³ hybrid orbitals.
B) sp² hybridization leaves one 2p orbital unhybridized.
C) sp hybridization results from the hybridization of two 2p orbitals.
D) Hybridization occurs between atomics orbitals of the lowest-possible energy.
E) Hybridization only occurs in molecules possessing single covalent bonds.

Question 17

Rotation is possible about which of the following bonds along the backbone of a polypeptide chain? Select any that apply.

A) C ^$\alpha$ -C
B) C ^$\alpha$ -N
C) C-N (peptide)

Question 18

Propane has the structural formula shown below. How many different conformations can propane exist in?

A) One
B) Two
C) Three
D) Four
E) An infinite number

Question 19

A molecule of water adopts which one of the following geometries?

A) Linear
B) Trigonal planar
C) Octahedral
D) Tetrahedral
E) Trigonal bipyramidal

Question 20

Carbon, hydrogen, nitrogen, and oxygen have the following atomic radii (in picometres): C = 77; H = 37; N = 74; O = 73. Which of the following covalent bonds is the shortest?

A) C-H
B) N-H
C) C-O
D) C-C
E) O-H

Question 21

Carbon, hydrogen, nitrogen, and oxygen have the following atomic radii (in picometres): C = 77; H = 37; O = 73. Which of the following covalent bonds is the longest?

A) C-C
B) C-O
C) C=C
D) C-H
E) C $\equiv$ C