Deck 8: Chemical Bonding I Basic Concepts

Question 1

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

A)1
B)2
C)0
D)3
E)7

Answer 1

2

Question 2

The Lewis dot symbol for the chloride ion is

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

Answer 2

^-

Question 3

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

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

Answer 3

4

Question 4

The Lewis dot symbol for the calcium ion is

A) ²⁺
B)
C) ²⁺
D)Ca²⁺
E)Ca

Question 5

Which of these compounds is most likely to be ionic?

A)KF
B)CCl₄
C)CS₂
D)CO₂
E)ICl

Question 6

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 7

Which of the following contains ionic bonding?

A)CO
B)SrF₂
C)Al
D)OCl₂
E)HCl

Question 8

Which of these compounds is most likely to be ionic?

A)NCl₃
B)BaCl₂
C)CO
D)SO₂
E)SF₄

Question 9

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

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

Question 10

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

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

Question 11

Select the element whose Lewis symbol is correct.

A)
B)
C)
D)
E)

Question 12

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

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

Question 13

The Lewis dot symbol for the a lead atom is

A)
B)
C)
D)
E)

Question 14

Select the element whose Lewis symbol is correct.

A)•Ga•
B)•Al•
C)Al•
D)
•
•
Tl
•
•

Question 15

Which of these compounds is most likely to be ionic?

A)GaAs
B)SrBr₂
C)NO₂
D)CBr₄
E)H₂O

Question 16

Which of the following is an ionic compound?

A)H₂S
B)NH₃
C)I₂
D)KI
E)CCl₄

Question 17

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 18

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 19

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

A)1
B)2
C)0
D)3
E)7

Question 20

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

A)1
B)2
C)4
D)6
E)8

Question 21

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 22

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 23

Which of the following is a covalent compound?

A)Na₂O
B)CaCl₂
C)Cl₂O
D)CsCl
E)Al₂O₃

Question 24

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 25

Which of these compounds is most likely to be covalent?

A)Rb₂S
B)SrCl₂
C)CS₂
D)CaO
E)MgI₂

Question 26

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

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

Question 27

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 28

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 29

Which of these compounds is most likely to be covalent?

A)KF
B)CaCl₂
C)SF₄
D)Al₂O₃
E)CaSO₄

Question 30

Which of these Lewis structures is incorrect?

A)
B)
C)
D)
E)

Question 31

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 32

Which of the following contains ionic bonding?

A)CO
B)SrF₂
C)Al
D)OCl₂
E)HCl

Question 33

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

A)NaCl
B)NaF
C)CaBr₂
D)CsI
E)CaCl₂

Question 34

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

A)SrO
B)NaF
C)CaBr₂
D)CsI
E)BaSO₄

Question 35

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 36

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 37

Which of the following contains covalent bonds?

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

Question 38

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

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

Question 39

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 40

Which of these compounds is most likely to be covalent?

A)CsOH
B)NF₃
C)Sr(NO₃)₂
D)CaO
E)LiF

Question 41

Select the correct Lewis structure for nitrogen trifluoride,NF₃.

A)
B)
C)
D)
E)

Question 42

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 43

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 44

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 45

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 46

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 47

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 48

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 49

Which one of the following Lewis structures is definitely incorrect?

A)
B)
C)
D)
E)

Question 50

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 51

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 52

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

A)
B)
C)
D)
E)

Question 53

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

A)
B)
C)
D)
E)

Question 54

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 55

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 56

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 57

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 58

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 59

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

A)
B)
C)
D)
E)

Question 60

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

A)CO₂
B)Cl₂
C)ICl
D)NO
E)SO₂

Question 61

In Ba(CN)₂,the bonding is

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

Question 62

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 63

Ionic compounds may carry a net positive or net negative charge.

Question 64

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 65

How many single bonds are bonded to sulfur in SF₆?

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

Question 66

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

A)HNF₂
B)H₂CO
C)N₂H₄
D)CaCl₂
E)ICl

Question 67

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

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

Question 68

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

A)N₂O
B)CS₂
C)PH₃
D)CCl₄
E)NO₂

Question 69

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 70

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 71

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 72

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 73

Which response includes all the molecules below that have a central atom that does not follow the octet rule? (1)H₂S,(2)BCl₃,(3)PH₃,(4)SF₄

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

Question 74

Ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with high ionization energy (metal)to an element with a low electron affinity (nonmetal).

Question 75

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

A)HCl
B)AsCl₅
C)ICl
D)NCl₃
E)Cl₂

Question 76

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 77

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 78

All of the following molecules contain only single bonds except

A)H₂O₂.
B)Cl₂.
C)CH₄.
D)H₂O.
E)SO₂.

Question 79

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

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

Question 80

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.