Deck 5: Chemical Bonding: the Covalent Bond Model

Question 1

Which of the following diatomic molecules contains the bond of greatest polarity?

A) N₂
B) Cl₂
C) ClI
D) BrF

Answer 1

BrF

Question 2

In which of the following molecular compounds are all the bonds single bonds?

A) CS₂
B) CS
C) NBr₃
D) O₂

Answer 2

NBr₃

Question 3

In which of the following bonds is the bond polarity incorrect?

A)
B)
C)
D)

Answer 3

Question 4

For which of the following pairs of elements would the compound formed between them most likely be a molecular compound?

A) Li and Br
B) Ba and O
C) N and S
D) Cs and F

Question 5

The correct name for the compound H₂Te is

A) hydrogen telluride
B) dihydrogen telluride
C) dihydrogen monotelluride
D) hydrogen monotelluride

Question 6

The Lewis structure for the polyatomic ion NO₂⁺ contains

A) two double bonds and eight nonbonding electrons
B) one double bond, one single bond, and twelve nonbonding electrons
C) two single bonds and twelve nonbonding electrons
D) two triple bonds and four nonbonding electrons

Question 7

VSEPR theory predicts that the geometry of the AsH₃ molecule is

A) linear
B) trigonal planar
C) trigonal pyramidal
D) tetrahedral

Question 8

The total number of nonbonding electron pairs present in the Lewis structure of SiH₄ is

A) zero
B) one
C) two
D) four

Question 9

In which of the following molecules is a coordinate covalent bond present?

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

Question 10

Which of the following sets of elements is arranged in order of decreasing electronegativity?

A) O, S, As
B) Cl, B, Cl
C) Br, Cl, P
D) Be, C, O

Question 11

Which of the following compounds contains both ionic and covalent bonds?

A) SiO₂
B) LiI
C) LiCN
D) PCl₃

Question 12

What is the geometry of the molecular compound formed by the reaction of sulfur with hydrogen?

A) linear
B) angular
C) trigonal planar
D) tetrahedral

Question 13

Which of the following statements contrasting covalent bonds and ionic bonds is correct?

A) Covalent bonds usually involve two nonmetals and ionic bonds usually involve two metals.
B) Covalent bonds usually involve two metals and ionic bonds usually involve a metal and a nonmetal.
C) Covalent bonds usually involve a metal and a nonmetal and ionic bonds usually involve two nonmetals.
D) Covalent bonds usually involve two nonmetals and ionic bonds usually involve a metal and a nonmetal.

Question 14

Which of the following statements concerning double covalent bonds is correct?

A) They are found only in molecules that contain P or atoms in the third period or higher.
B) They are only found in molecules that contain large atoms that can effectively overlap with each other.
C) They occur only between atoms containing 2 valence electrons.
D) They always involve the sharing of 4 electrons.

Question 15

Which of the following molecular compounds would have a Lewis structure that contains 10 electron dots?

A) HCN
B) H₂O
C) NH₃
D) CO₂

Question 16

Which of the following is a molecular compound that contains five atoms per molecule?

A) germanium tetrabromide
B) dinitrogen monoxide
C) dinitrogen pentoxide
D) nitrogen diselenide

Question 17

Which of the following linear molecules is a nonpolar molecule containing polar bonds?

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

Question 18

Given the following electronegativities: Na = 0.9, H = 2.1, Cl = 3.0 which of the following statements is true?

A) H₂, Cl₂, and HCl are polar covalent molecules.
B) NaCl is a polar covalent compound and HCl is an ionic compound.
C) HCl is a nonpolar covalent compound and Cl₂ is a polar covalent molecule.
D) Cl₂ is a nonpolar covalent molecule and HCl is a polar covalent molecule.

Question 19

Electronegativity is a concept that is useful along with other concepts in

A) predicting the polarity of a bond
B) deciding how many electrons are involved in a bond
C) formulating a statement of the octet rule
D) determining the charge on a polyatomic ion

Question 20

Which of the following statements concerning coordinate covalent bonds is correct?

A) One of the atoms involved must be a metal and the other a nonmetal.
B) Both atoms involved in the bond contribute three electrons to the bond.
C) Once formed, they are indistinguishable from any other covalent bond.
D) They occur only in molecules where all bonds are single bonds.

Question 21

For which of the following pairs of molecular compounds do both members of the pair contain the same number of atoms per molecule?

A) hydrogen peroxide and ammonia
B) hydrazine and methane
C) phosphine and ethane
D) more than one correct response
E) no correct response

Question 22

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) Once a coordinate covalent bond is formed, there is no way to distinguish it from any of the other covalent bonds in a molecule.
(2) The least electronegative elements are located to the far right in the periodic table.
(3) The central concept of VSEPR theory is that the electron groups in the valence shell of a central atom in a molecule attract each other.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 23

The number of nonbonding electrons exceeds the number of bonding electrons in the Lewis structure of which of the following molecules?

A) HCN
B) NH₃
C) H₂O
D) more than one correct response
E) no correct response

Question 24

An angular geometry is associated with molecules in which the central atom has

A) two bonds and two nonbonding electron groups
B) two bonds and one nonbonding electron group
C) two bonds and no nonbonding electron groups
D) more than one correct response
E) no correct response

Question 25

Which of the following statements concerning differences between ionic and molecular compounds is correct?

A) Molecular compounds contain two elements, and ionic compounds contain three or more elements.
B) Ionic compounds contain oxygen, and molecular compounds do not.
C) Molecular compounds possess a molecular structural unit, and ionic compounds do not.
D) More than one correct response.
E) No correct response.

Question 26

In which of the following pairs of compounds are both members of the pair molecular compounds?

A) PCl₃ and LiBr
B) CCl₄ and KOH
C) NaH and CaF₂
D) more than one correct response
E) no correct response

Question 27

For which of the following pairs of compounds do both members of the pair have names that contain the prefix di-?

A) SCl₂ and K₂O
B) CO₂ and N₂O
C) N₂O₃ and H₂S
D) more than one correct response
E) no correct response

Question 28

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) Nonbonding electron pairs are present on both the H and the F in the molecule HF.
(2) The two atoms involved in a multiple covalent bond must always be atoms of the same element.
(3) A molecule of hydrogen peroxide contains more atoms than does a molecule of ammonia.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 29

Sixteen electrons are present in the Lewis structure of which of the following molecules?

A) CO₂
B) N₂O
C) SO₂
D) more than one correct response
E) no correct response

Question 30

Which of the following tetrahedral molecules is polar?

A) CH₄
B) CF₄
C) CH₃F
D) more than one correct response
E) no correct response

Question 31

Coordinate covalent bonds differ from normal covalent bonds in that:

A) One atom supplies more electrons to the bond than the other atom.
B) The electrons of the bond move about in a coordinated pattern.
C) Atoms involved must always also possess nonbonding electron pairs.
D) More than one correct response.
E) No correct response.

Question 32

If the electronegativity difference between two atoms X and Z is 1.0, the bond between the two atoms would be

A) ionic
B) polar covalent
C) coordinate covalent
D) more than one correct response
E) no correct response

Question 33

A period 2 nonmetal, X, forms the molecular compound NX₃. Which of the following are also correct formulas for molecular compounds involving X?

A) HX
B) OX₂
C) C₂X
D) more than one correct response
E) no correct response

Question 34

In which of the following pairs of triatomic species do both members of the pair have the same geometry?

A) H₂O and H₂S
B) NO₂⁺ and NO₂^-
C) HCN and FNO
D) more than one correct response
E) no correct response

Question 35

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) The predicted formula of the simplest molecular compound formed between nitrogen and fluorine is NF₂.
(2) The majority of compounds contain covalent bonds rather than ionic bonds.
(3) In VSEPR theory, double bonds exert double the influence of single bonds in determining molecular geometry.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 36

In which of the following triatomic molecules or ions are both of the bonds multiple bonds?

A) HCN
B) CO₂
C) NO₂^-
D) more than one correct response
E) no correct response

Question 37

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) A nitrogen-oxygen bond is more polar than a nitrogen-fluorine bond.
(2) There are no nonbonding electron pairs present on the central atom in a trigonal planar molecule.
(3) The "normal" number of covalent bonds that the element carbon forms is four.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 38

In which of the following pairs of bonds is the first listed bond more polar than the second listed bond?

A) N-N and N-F
B) P-Cl and S-Cl
C) C-N and C-F
D) more than one correct response
E) no correct response

Question 39

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) The number of "electron dots" in the Lewis formula for the compound HNO₃ is 24.
(2) Atoms participating in coordinate covalent bonds generally do not form the "normal" number of covalent bonds expected for that element.
(3) Some molecules are nonpolar even though all bonds within the molecules are polar.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 40

Which of the following statements concerning molecular polarity is correct?

A) All diatomic molecules are polar.
B) All linear triatomic molecules are nonpolar.
C) Triatomic molecules in which all bonds are polar must be polar.
D) More than one correct response.
E) No correct response.

Question 41

Compound in which the arrangement of electron groups about the central atom is not tetrahedral

A)
B)
C)
D)

Question 42

Characterize the bond that forms between Li (1.0) and O (3.5).

A) polar covalent bond
B) nonpolar covalent bond
C) coordinate covalent bond
D) ionic bond

Question 43

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) An unpaired electron is present in the Lewis structure for the molecule NO.
(2) The molecule nitric oxide is naturally present in the human body.
(3) The acronym OPR stands for odor replication process.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 44

Compound that is nonpolar

A)
B)
C)
D)

Question 45

Compound that has an angular geometry

A)
B)
C)
D)

Question 46

Choose the correct number of nonbonding electrons in the Lewis structure for CN^- ion.

A) zero
B) one
C) four
D) eight

Question 47

Compound with a trigonal pyramidal geometry

A)
B)
C)
D)

Question 48

Characterize the bond that forms between N (3.0) and Cl (3.0).

A) polar covalent bond
B) nonpolar covalent bond
C) coordinate covalent bond
D) ionic bond

Question 49

Compound that contains both polar and nonpolar bonds

A)
B)
C)
D)

Question 50

Choose the correct number of shared electrons in the Lewis structure for H₂O.

A) zero
B) one
C) four
D) eight

Question 51

Choose the correct number of double bonds in the Lewis structure for CH₄.

A) zero
B) one
C) four
D) eight

Question 52

Characterize the bond that forms between N (3.0) and F (4.0).

A) polar covalent bond
B) nonpolar covalent bond
C) coordinate covalent bond
D) ionic bond

Question 53

Characterize the bond that forms between C (2.5) and H (2.1).

A) polar covalent bond
B) nonpolar covalent bond
C) coordinate covalent bond
D) ionic bond

Question 54

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) A pentaatomic tetrahedral molecule may be polar or nonpolar depending on the identities of the atoms present.
(2) A bond between atoms that differ in electronegativity by 2.1 units is classified as a polar covalent bond.
(3) The sum of the number of valence electrons a nonmetallic atom has and the number of covalent bonds it "normally" forms is eight.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 55

Choose the correct number of electrons in the Lewis structure for NH₃.

A) zero
B) one
C) four
D) eight

Question 56

Choose the correct number of shared electrons contributed by oxygen to the coordinate covalent bond in CO.

A) zero
B) one
C) four
D) eight

Question 57

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) In the molecule SO₂ both a single bond and a double bond are present.
(2) A linear symmetrical triatomic molecule will always be nonpolar.
(3) The total number of valence electrons available for bonding in the polyatomic ion PO₄^3- is 30.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 58

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) Both tetrahedral and trigonal pyramidal molecules have four VSEPR electron groups about the central atom.
(2) The greater the electronegativity difference between two bonded atoms the greater the polarity of the bond between the two atoms.
(3) A double covalent bond between two atoms is approximately twice as strong as a single covalent bond between the same two atoms.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 59

Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices provided. (1) In the molecule N₂ there are more bonding electron pairs than nonbonding electron pairs.
(2) Electronegativity values for sequential period 2 elements differ by 0.5 units.
(3) The octet rule does not apply to covalent compounds in which coordinate covalent bonding is present.

A) All three statements are true.
B) Two of the three statements are true.
C) Only one of the statements is true.
D) None of the statements is true.

Question 60

Characterize the bond that forms between Be (1.5) and C (2.5).

A) polar covalent bond
B) nonpolar covalent bond
C) coordinate covalent bond
D) ionic bond

Question 61

A, X, and Z are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear Z-A-X?

A) polar molecule with polar bonds
B) polar molecule with both polar and nonpolar bonds
C) nonpolar molecule with polar bonds
D) nonpolar molecule with nonpolar bonds

Question 62

A and X are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear A-A-X?

A) polar molecule with polar bonds
B) polar molecule with both polar and nonpolar bonds
C) nonpolar molecule with polar bonds
D) nonpolar molecule with nonpolar bonds

Question 63

Use the following to answer the questions below:
For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all.
a) contains three or fewer atoms
b) contains four atoms
c) contains five atoms
d) contains six or more atoms
Select the correct number of atoms in one molecule of nitrogen dioxide.

A) contains three or fewer atoms
B) contains four atoms
C) contains five atoms
D) contains six or more atoms

Question 64

A and X are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear A-X-A?

A) polar molecule with polar bonds
B) polar molecule with both polar and nonpolar bonds
C) nonpolar molecule with polar bonds
D) nonpolar molecule with nonpolar bonds

Question 65

A, X, and Z are different elements with different electronegativities. What choice below best describes the polarity of the bonds and molecule in a linear A-X-Z?

A) polar molecule with polar bonds
B) polar molecule with both polar and nonpolar bonds
C) nonpolar molecule with polar bonds
D) nonpolar molecule with nonpolar bonds

Question 66

Use the following to answer the questions below:
For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all.
a) contains three or fewer atoms
b) contains four atoms
c) contains five atoms
d) contains six or more atoms
Select the correct number of atoms in one molecule of hydrazine.

A) contains three or fewer atoms
B) contains four atoms
C) contains five atoms
D) contains six or more atoms

Question 67

Use the following to answer the questions below:
For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all.
a) contains three or fewer atoms
b) contains four atoms
c) contains five atoms
d) contains six or more atoms
Select the correct number of atoms in one molecule of dichlorine monoxide.

A) contains three or fewer atoms
B) contains four atoms
C) contains five atoms
D) contains six or more atoms

Question 68

Use the following to answer the questions below:
For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all.
a) contains three or fewer atoms
b) contains four atoms
c) contains five atoms
d) contains six or more atoms
Select the correct number of atoms in one molecule of hydrogen sulfide.

A) contains three or fewer atoms
B) contains four atoms
C) contains five atoms
D) contains six or more atoms

Question 69

What choice below best describes the polarity of the bonds and molecule in a linear A-A-A?

A) polar molecule with polar bonds
B) polar molecule with both polar and nonpolar bonds
C) nonpolar molecule with polar bonds
D) nonpolar molecule with nonpolar bonds

Question 70

Use the following to answer the questions below:
For each of the compounds, select from the response list the correct number of atoms present in a molecule of the compound. Responses on the right may be used more than once or need not be used at all.
a) contains three or fewer atoms
b) contains four atoms
c) contains five atoms
d) contains six or more atoms
Select the correct number of atoms in one molecule of methane.

A) contains three or fewer atoms
B) contains four atoms
C) contains five atoms
D) contains six or more atoms