Deck 8: Chemical Bonding I: Basic Concepts

Question 1

How many dots does the Lewis dot symbol for sodium have around it?

A) 1
B) 2
C) 0
D) 3
E) 11

Answer 1

1

Question 2

Select the element whose Lewis symbol is correct.

A)
B)
C)
D)
E)

Answer 2

Question 3

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?

A) Electron configuration
B) Valence electrons
C) Atomic number
D) Atomic mass
E) Core electrons

Answer 3

Valence electrons

Question 4

The Lewis dot symbol for the chloride ion is

A)
B)
C)
D)
E) Cl^-

Question 5

How many dots does the Lewis dot symbol for argon have around it?

A) 1
B) 2
C) 4
D) 10
E) 8

Question 6

Which of the following contains ionic bonding?

A) CO
B) SrF₂
C) Al
D) OCl₂
E) HCl

Question 7

Which of these compounds is most likely to be ionic?

A) NCl₃
B) BaCl₂
C) CO
D) SO₂
E) SF₄

Question 8

Which of these compounds is most likely to be ionic?

A) KF
B) CCl₄
C) CS₂
D) CO₂
E) ICl

Question 9

Which of these compounds is most likely to be ionic?

A) GaAs
B) SrBr₂
C) NO₂
D) CBr₄
E) H₂O

Question 10

Select the element whose Lewis symbol is correct.

A) •Ga•
B)
C) Al•
D)

Question 11

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the symbol represent?

A) Electron configuration
B) Valence electrons
C) Atomic number
D) Atomic mass
E) Nucleus and core electrons

Question 12

The Lewis dot symbol for the calcium ion is

A)
B)
C)
D) Ca²⁺
E) Ca

Question 13

How many dots does the Lewis dot symbol for chlorine have around it?

A) 1
B) 2
C) 5
D) 7
E) 17

Question 14

The Lewis dot symbol for the S^2- ion is

A)
B)
C) S^2-
D)
E)

Question 15

How many dots does the Lewis dot symbol for magnesium have around it?

A) 1
B) 2
C) 0
D) 3
E) 12

Question 16

Which of the following is an ionic compound?

A) H₂S
B) NH₃
C) I₂
D) KI
E) CCl₄

Question 17

How many dots does the Lewis dot symbol for oxygen have around it?

A) 4
B) 2
C) 6
D) 3
E) 8

Question 18

Which of these pairs of elements would be most likely to form an ionic compound?

A) Cl and I
B) Al and K
C) Cl and Mg
D) C and S
E) Al and Mg

Question 19

How many dots does the Lewis dot symbol for carbon have around it?

A) 4
B) 2
C) 6
D) 3
E) 7

Question 20

The Lewis dot symbol for the a lead atom is

A)
B)
C)
D)
E)

Question 21

The total number of lone pairs in NCl₃ is

A) 6.
B) 8.
C) 9.
D) 10.
E) 13.

Question 22

Which of these compounds is most likely to be covalent?

A) CsOH
B) NF₃
C) Sr(NO₃)₂
D) CaO
E) LiF

Question 23

Which of these ionic solids would have the largest lattice energy?

A) SrO
B) NaF
C) CaBr₂
D) CsI
E) BaSO₄

Question 24

Which of the following contains ionic bonding?

A) CO
B) SrF₂
C) Al
D) OCl₂
E) HCl

Question 25

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the symbol represent?

A) Electron configuration
B) Valence electrons
C) Atomic number
D) Atomic mass
E) Nucleus and core electrons

Question 26

Which of the following is a covalent compound?

A) Na₂O
B) CaCl₂
C) Cl₂O
D) CsCl
E) Al₂O₃

Question 27

Which of the following contains covalent bonds?

A) BaO
B) IBr
C) Mg
D) LiBr
E) Cu

Question 28

Select the compound with the highest (i.e., most negative) lattice energy.

A) CaS(s)
B) BaO(s)
C) NaI(s)
D) LiBr(s)
E) MgO(s)

Question 29

What types of elements undergo covalent bonding?

A) a metal and a noble gas
B) a nonmetal and a metal
C) two nonmetals
D) two Group 1A elements
E) an actinide

Question 30

The Lewis dot symbol consists of the symbol for the element surrounded by dot(s). What does the dot or dots represent?

A) Electron configuration
B) Valence electrons
C) Atomic number
D) Atomic mass
E) Core electrons

Question 31

Which of these ionic solids would have the largest lattice energy?

A) NaCl
B) NaF
C) CaBr₂
D) CsI
E) CaCl₂

Question 32

The Lewis structure for CS₂ is:

A)
B)
C)
D)

Question 33

How many lone pairs of electrons need to be added to complete this Lewis structure?

A) 5
B) 8
C) 6
D) 1
E) 16

Question 34

What types of elements undergo ionic bonding?

A) two metals
B) a nonmetal and a metal
C) two nonmetals
D) two Group 1A elements
E) two noble gases

Question 35

The lattice energy for ionic crystals increases as the charge on the ions ________ and the size of the ions ________.

A) increases, increases
B) increases, decreases
C) decreases, increases
D) decreases, decreases
E) None of these is generally correct.

Question 36

The total number of bonding electrons in a molecule of formaldehyde (H₂CO) is

A) 3.
B) 4.
C) 6.
D) 8.
E) 18.

Question 37

Select the compound with the lowest (i.e., least negative) lattice energy.

A) CsBr(s)
B) NaCl(s)
C) SrO(s)
D) CaO(s)
E) KBr(s)

Question 38

Which of these compounds is most likely to be covalent?

A) Rb₂S
B) SrCl₂
C) CS₂
D) CaO
E) MgI₂

Question 39

Which of these compounds is most likely to be covalent?

A) KF
B) CaCl₂
C) SF₄
D) Al₂O₃
E) CaSO₄

Question 40

Which molecule has the largest dipole moment?

A) HF
B) HI
C) HBr
D) HCl
E) All of the molecules have the same dipole moment.

Question 41

What is wrong with this Lewis structure?

A) There are too many electrons.
B) There are too few electrons.
C) The O atom does not have an octet.
D) The C atom does not have an octet.
E) There is nothing wrong with this Lewis structure.

Question 42

In which one of the following structures does the central atom have a formal charge of +2?

A)
B)
C)
D)
E)

Question 43

What is the formal charge on phosphorus in a Lewis structure for the phosphate ion that satisfies the octet rule?

A) -2
B) -1
C) 0
D) +1
E) +2

Question 44

Select the correct Lewis structure for NOCl, a reactive material used as an ionizing solvent.

A)
B)
C)
D)
E) None of these choices is correct.

Question 45

Which of these Lewis structures is incorrect?

A)
B)
C)
D)
E)

Question 46

The formal charge on Cl in the structure shown for the perchlorate ion is ________.

A) -2
B) -1
C) 0
D) +1
E) +2

Question 47

In which one of the following is the best Lewis structure a resonance structure?

A) SO₃
B) BF₃
C) I₃^-
D) SCO (C = central atom)
E) SO₃^2-

Question 48

In the best Lewis structure for the fulminate ion, CNO^-, what is the formal charge on the central nitrogen atom?

A) +2
B) +1
C) 0
D) -1
E) -2

Question 49

In the resonance structure of sulfur dioxide, the sulfur atom has one single bond and one double bond. What is the formal charge of this sulfur atom?

A) 0
B) +1
C) -1
D) +2
E) -2

Question 50

Hydrazine, N₂H₄, is a good reducing agent that has been used as a component in rocket fuels. Select its Lewis structure.

A)
B)
C)
D)
E) None of the choices is correct.

Question 51

In the Lewis structure of the iodate ion, IO₃^-, that satisfies the octet rule, the formal charge on the central iodine atom is

A) +2.
B) +1.
C) 0.
D) -1.
E) -2.

Question 52

Which one of the following Lewis structures is definitely incorrect?

A)
B)
C)
D)
E)

Question 53

Select the Lewis structure for XeO₂F₂ which correctly minimizes formal charges.

A)
B)
C)
D)
E)

Question 54

Which of these choices is the best Lewis structure for ozone, O₃?

A)
B)
C)
D)
E)

Question 55

The Lewis structure for a chlorate ion, ClO₃^-, should show ________ single bond(s), ________ double bond(s), and ________ lone pair(s).

A) 1, 2, 7
B) 3, 0, 9
C) 2, 1, 9
D) 3, 0, 10
E) 1, 2, 8

Question 56

Select the correct Lewis structure for nitrogen trifluoride, NF₃.

A)
B)
C)
D)
E)

Question 57

In the following Lewis structure for ClO₃F, chlorine has a formal charge of ________ and an oxidation number of ________.

A) 7, 7
B) 7, -1
C) 1, 1
D) 1, -1
E) 1, 7

Question 58

Which pair of Lewis structures is not a pair of resonance structures?

A)
B)
C)
D) All of these pairs are resonance structures of the same species.
E) None of these pairs is resonance structures of the same species.

Question 59

The number of resonance structures for the sulfur dioxide molecule that satisfy the octet rule is

A) 1.
B) 2.
C) 3.
D) 4.
E) none of these

Question 60

The number of resonance structures for the nitrate ion that satisfy the octet rule is

A) 1.
B) 2.
C) 3.
D) 4.
E) none of these

Question 61

Ignoring resonance, the formal charge on the nitrogen atom in the nitrate ion is

A) +2.
B) +1.
C) 0.
D) -1.
E) -2.

Question 62

Which of the following represents the most polar bond?

A) B-C
B) S-O
C) C-O
D) B-O
E) C-C

Question 63

Which of these substances will display an incomplete octet in its Lewis structure?

A) CO₂
B) Cl₂
C) ICl
D) NO
E) SO₂

Question 64

Which statement is false concerning ionic bonds and compounds?

A) Ionic bonds are a result of electrostatic forces.
B) Ionic bonds usually occur between elements with high and low electron affinities.
C) Elements of an ionic compound usually carry the same charge.
D) Lewis dot symbols are useful for tracking electrons.

Question 65

How many single bonds are bonded to sulfur in SF₆?

A) 2
B) 4
C) 6
D) 7
E) 8

Question 66

How many total resonance structures can be drawn for the sulfate ion, SO₄^2-?

A) 2
B) 3
C) 4
D) 5
E) 6

Question 67

Which one of the following compounds is most likely to be ionic?

A) HNF₂
B) H₂CO
C) N₂H₄
D) CaCl₂
E) ICl

Question 68

In which of the following species does the central atom violate the octet rule?

A) CH₄
B) SF₄
C) PCl₄⁺
D) CCl₃⁺
E) NH₃

Question 69

If an element is bonded to 4 other atoms and has a formal charge of +1, what group must the element be in?

A) 3A
B) 4A
C) 5A
D) 6A
E) 7A

Question 70

All of the following molecules contain only single bonds except

A) H₂O₂.
B) Cl₂.
C) CH₄.
D) H₂O.
E) SO₂.

Question 71

Based on ionic radii and charges, which of the following solids would have the greatest lattice energy?

A) SrO
B) CsI
C) MgCl₂
D) KF
E) NaF

Question 72

Identify the correct equation to calculate the formal charge on an atom.

A) formal charge = valence electrons - lone pair electrons
B) formal charge = valence electrons - associated electrons
C) formal charge = valence electrons - bonding electrons
D) formal charge = bonding electrons + lone pair electrons
E) formal charge = valence electrons - bonding electrons + lone pair electrons

Question 73

In which one of the following species is the central atom (the first atom in the formula) likely to violate the octet rule?

A) BF₄^-
B) XeO₃
C) SiCl₄
D) NH₃
E) CH₂Cl₂

Question 74

What is the formal charge on the fluorine in ClF₂⁺?

A) -1
B) +1
C) 0
D) -2
E) -3

Question 75

Which response includes all the molecules below that have a central atom that does not follow the octet rule? (1) H₂S, (2) BCl_3, (3) PH_3, (4) SF₄

A) (2) and (4)
B) (2) and (3)
C) (1) and (2)
D) (3) and (4)
E) (1) and (4)

Question 76

What formal charge resides on the carbon of CO₃^2-?

A) 0
B) +1
C) +2
D) +3
E) +4

Question 77

Which of these molecules has an atom with an expanded octet?

A) HCl
B) AsCl₅
C) ICl
D) NCl₃
E) Cl₂

Question 78

Which of these elements is most likely to exhibit an expanded octet in its compounds?

A) O
B) S
C) Na
D) C
E) N

Question 79

In Ba(CN)₂, the bonding is

A) essentially ionic.
B) essentially covalent.
C) both ionic and covalent.
D) neither ionic nor covalent.

Question 80

Which molecule has a Lewis structure that does not obey the octet rule?

A) N₂O
B) CS₂
C) PH₃
D) CCl₄
E) NO₂