Chapter 10 Practice Questions

6) The Lewis model predicts that the formula for a compound between barium and sulfur is: A) BaS B) Ba2S C) BaS2 D) BaS3 E) none of the above

A) BaS

69) Which compound below is a polar molecule AND has a linear molecular geometry? A) CO B) CO2 C) CH4 D) H2O E) none of the above

A) CO

61) Which compound listed below will dissolve in NH3? A) H2S B) CO2 C) O2 D) all of the compounds E) none of the compounds

A) H2S

29) Consider the Lewis structures for the compound SO3 and the polyatomic ions SO32- and SO42-. Which of these must exist as a set of resonance structures? A) SO3 only B) SO32- only C) SO42- only D) all of these show resonance E) none of these show resonance

A) SO3 only

40) What is the molecular geometry if you have a double bond, a single bond and 1 lone pair around the central atom? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

A) bent

41) What is the molecular geometry of ozone, O3? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

A) bent

47) What is the molecular geometry of SCl2? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

A) bent

67) The electronegativity value for Mg is 1.2 and the value for O is 3.5. Based on these values, what type of bond is expected for a compound formed between Mg and O? A) ionic B) pure covalent C) polar covalent D) not enough information E) none of the above

A) ionic

36) What is the electron geometry if you have 2 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

A) linear

16) Which sequence below represents the proper order of increasing bond strength? A) single < double < triple B) double < single < triple C) single < triple < double D) triple < double < single E) none of the above

A) single < double < triple

53) The elements with the highest electronegativity values tend to be found in the: A) upper right-side of the periodic table. B) lower right-side of the periodic table. C) upper left-side of the periodic table. D) lower left-side of the periodic table. E) center of the periodic table.

A) upper right-side of the periodic table.

42) Which of the following compounds would have a linear molecular geometry? 1. N2 2. H2S 3. CO2 A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) 1,2 and 3 E) neither 1, 2,or 3

B) 1 and 3 only

33) What is the angle between electron groups in the tetrahedral geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

B) 109.5°

10) What is the correct Lewis structure for Br2? A) Br-Br B) : - : C) = D) : Br ≡ Br : E) none of the above

B) : - :

62) Which compound listed below will dissolve in carbon tetrachloride, CCl4? A) NaCl B) CS2 C) NH3 D) all of the compounds E) none of the compounds

B) CS2

63) Which of the following statements is TRUE for the covalent molecule HCl? A) Chlorine is more electronegative and the shared electron pair is likely to be found on the hydrogen atom. B) Chlorine is more electronegative and the shared electron pair is likely to be found on the chlorine atom. C) Hydrogen is more electronegative and the shared electron pair is likely to be found on the hydrogen atom. D) Hydrogen is more electronegative and the shared electron pair is likely to be found on the chlorine atom. E) none of the above

B) Chlorine is more electronegative and the shared electron pair is likely to be found on the chlorine atom.

58) Which substance listed below is a polar molecule? A) NH4+ B) Cl2O C) SiCl4 D) all of the compounds E) none of the compounds

B) Cl2O

30) Which one of the following molecules is NOT capable of having resonance structures? A) SeO2 B) H2O C) SO2 D) O3 E) none of the above

B) H2O

56) Which molecule listed below has a polar covalent bond? A) NaCl B) H2O C) H2 D) all of the compounds E) none of the compounds

B) H2O

7) The Lewis model predicts that the formula for a compound between potassium and sulfur is: A) KS B) K2S C) KS2 D) K3S E) none of the above

B) K2S

2) Which Lewis structure below correctly represents KCl? A) K⁺ []⁻ B) K⁺ [::]⁻ C) K :: D) :: :: E) none of the above

B) K⁺ [::]⁻

22) The Lewis structure, [:-=] best represents: A) NO2+ B) NO2- C) NO2 D) both NO2+ and NO2- E) answers A, B, and C

B) NO2-

52) Which term matches the definition: A separation of charge within a bond? A) coulombic attraction B) dipole moment C) pure covalent D) nonpolar covalent E) electronegativity

B) dipole moment

43) What is the molecular geometry of carbon dioxide, CO2? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

B) linear

37) What is the electron geometry if you have 3 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

B) trigonal planar

20) The central atom in the chlorite anion, ClO2- is surrounded by: A) one bonding and three unshared pairs of electrons. B) two bonding and two unshared pairs of electrons. C) two bonding and one unshared pair of electrons. D) two double bonds and no unshared pairs of electrons. E) none of the above

B) two bonding and two unshared pairs of electrons.

32) What is the angle between electron groups in the trigonal planar electron geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

C) 120°

15) The Lewis structure for carbon monoxide is C=O This structures shows: A) 4 lone pairs and 1 bonding pair. B) 4 lone pairs and 3 bonding pairs. C) 2 lone pairs and 3 bonding pairs. D) 2 lone pairs and 1 bonding pair. E) none of the above

C) 2 lone pairs and 3 bonding pairs.

11) What is the correct Lewis structure for O2? A) O-O B) :-: C) = D) : O ≡ O : E) none of the above

C) =

64) Which of the following statements about the water molecule is TRUE? A) A water molecule has two dipole moments and they cancel each other. B) A water molecule is symmetrical and therefore is nonpolar. C) A water molecule is asymmetric and therefore is polar. D) The electronegativities of hydrogen and oxygen are equal and therefore a water molecule is nonpolar. E) none of the above

C) A water molecule is asymmetric and therefore is polar.

4) The Lewis model predicts that the formula of a compound formed between bromine and aluminum is: A) AlBr B) Al2Br C) AlBr3 D) AlBr2 E) none of the above

C) AlBr3

5) The Lewis model predicts that the formula for a compound between fluorine and calcium is: A) CaF B) Ca2F C) CaF2 D) CaF3 E) none of the above

C) CaF2

55) Which molecule listed below has a nonpolar covalent bond? A) NaCl B) H2O C) H2 D) all of the compounds E) none of the compounds

C) H2

60) Which compound listed below will dissolve in water? A) CCl4 B) SiO2 C) NH3 D) all of the compounds E) none of the compounds

C) NH3

66) The electronegativity value for N is 3.0 and that for O is 3.5. Based on these values, which of the following statements is TRUE about the compound NO? A) NO is an ionic compound. B) NO is a pure covalent compound. C) NO is a polar covalent compound. D) There is not enough enough information to determine the nature of NO. E) None of the above statements is true.

C) NO is a polar covalent compound

70) How does soap work? A) Soap works by breaking grease molecules into smaller molecules that dissolve in water. B) Soap works by making water into a nonpolar liquid which grease can dissolve in. C) Soap works by having a polar end and a nonpolar end which allows the water and oil to interact indirectly. D) Soap works by having a polar end which attaches to the grease molecule and polarizes it and turns the grease molecule into another soap molecule. This is a chain reaction. E) none of the above

C) Soap works by having a polar end and a nonpolar end which allows the water and oil to interact indirectly.

1) How many lone electron pairs does the ClO (-1 charged) polyatomic anion have? A) one B) three C) six D) two E) none of the above

C) six

35) What is the electron geometry if you have 4 electron groups around the center atom? A) linear B) trigonal planar C) tetrahedral D) trigonal bipyramidal E) not enough information

C) tetrahedral

39) What is the molecular geometry if you have 4 single bonds around the central atom? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

45) What is the molecular geometry of SiH4? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

46) What is the molecular geometry of CCl4? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

48) What is the molecular geometry of NH4+? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

C) tetrahedral

49) The electron geometry and the molecular geometry of ammonia (NH3) are, respectively: A) trigonal planar, bent. B) tetrahedral, tetrahedral. C) tetrahedral, trigonal pyramidal. D) tetrahedral, bent. E) none of the above

C) tetrahedral, trigonal pyramidal.

19) The central atom in the chlorate anion, ClO3- is surrounded by: A) two bonding and two unshared pairs of electrons. B) one bonding and three unshared pairs of electrons. C) three bonding and one unshared pair of electrons. D) two double bonds and no unshared pairs of electrons. E) none of the above.

C) three bonding and one unshared pair of electrons.

26) Which symbol should be used between two structures that represent resonance structures? A) → B) ← C) ↔ D) ≡ E) none of the above

C) ↔

31) What is the angle between electron groups in the linear electron geometry? A) 90° B) 109.5° C) 120° D) 180° E) not enough information

D) 180°

17) How many valence electrons are in the nitrate ion? A) 18 B) 22 C) 23 D) 24 E) 26

D) 24

18) The total number of electrons to be counted for the Lewis structure of the PO43- polyatomic ion is: A) 8. B) 26. C) 29. D) 32. E) none of the above

D) 32.

13) How many bonding electrons are in the Lewis structure of N2? A) 2 B) 3 C) 4 D) 6 E) none of the above

D) 6

14) How many bonding electrons are in the Lewis structure of carbon monoxide, CO? A) 2 B) 3 C) 4 D) 6 E) none of the above

D) 6

21) What is the correct Lewis structure for CO2? A) : --: B) : ==: C) : = C =: D) : = C = : E) none of the above

D) : = C = :

12) What is the correct Lewis structure for N2? A) N-N B) :-: C) = D) : N ≡ N : E) none of the above

D) : N ≡ N :

27) Which set shows the correct resonance structures for SeO2? A) :--: ↔ == B) :=-: ↔ : -=: C) := Se =↔ : O ≡ Se-:↔ :-Se ≡ O : D) =-: ↔ :-= E) SeO2 does not have a resonance structure.

D) =-: ↔ :-=

65) Which of the following statements are TRUE about the BF3 molecule? A) BF3 has a trigonal planar molecular geometry. B) BF3 violates the octet rule for the central atom. C) BF3 is nonpolar. D) All of the above statements are true. E) None of the above are true.

D) All of the above statements are true.

9) What is the correct Lewis structure for water? A) H-::-H B) :--: C) H==H D) H--H E) none of the above

D) H--H

3) Which Lewis structure below correctly represents the compound formed between magnesium and sulfur? A) Mg⁺ [::]⁻ B) Mg⁺ [::]⁻2 Mg⁺ C) [::]⁻ Mg⁺2 [::]⁻ D) Mg⁺2 [::]⁻2 E) none of the above

D) Mg⁺2 [::]⁻2

28) Which of the following compounds have resonance structures? A) CH4 B) H2O C) NH3 D) O3 E) None of the compounds have resonance structures.

D) O3

51) Which of the following has a tetrahedral electron geometry and a trigonal pyramidal molecular geometry? A) Br2O B) GeH4 C) SO2 D) PF3 E) none of the above

D) PF3

23) What is the correct Lewis structure for CN⁻? A) [C-N]⁻ B) [:-:]⁻ C) [=:]⁻ D) [: C ≡ N :]⁻ E) none of the above

D) [: C ≡ N :]⁻

8) When a nonmetal bonds with a nonmetal: A) a molecular compound forms. B) a covalent bond is involved. C) electrons are shared. D) all of the above are true E) none of the above

D) all of the above are true

57) Which molecule listed below is a polar molecule? A) NH3 B) H2O C) HCN D) all of the compounds E) none of the compounds

D) all of the compounds

59) Which molecule listed below is a nonpolar molecule? A) CCl4 B) CO2 C) BH3 D) all of the compounds E) none of the compounds

D) all of the compounds

24) The correct Lewis structure for BF3 would have exactly: A) 1 double bond. B) 2 double bonds. C) 1 triple bond. D) no double bonds. E) none of the above

D) no double bonds.

2) When a molecule has four electron groups with none of them lone pairs, the molecular geometry will be: A) linear B) bent C) trigonal pyramidal D) tetrahedral E) none of the above

D) tetrahedral

50) The electron geometry and the molecular geometry of water are, respectively: A) trigonal planar, bent. B) tetrahedral, tetrahedral. C) tetrahedral, trigonal pyramidal. D) tetrahedral, bent. E) none of the above

D) tetrahedral, bent.

38) What is the molecular geometry if you have 3 single bonds and 1 lone pair around the central atom? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

D) trigonal pyramidal

44) What is the molecular geometry of PH3? A) bent B) linear C) tetrahedral D) trigonal pyramidal E) not enough information

D) trigonal pyramidal

1) Which of the following statements about Lewis structures is FALSE? A) An octet is when an atom has 8 valence electrons. B) A duet is a stable electron configuration for helium. C) An ionic bond occurs when electrons are transferred. D) A covalent bond occurs when electrons are shared. E) All of the above statements are true.

E) All of the above statements are true.

68) Consider the following electronegativity values: H=2.1, Cl= 3.0, F=4.0 Which molecule below would you expect to have the more polar bond? A) H2 B) Cl2 C) F2 D) HCl E) HF

E) HF

34) Which of the following is considered a single electron group? A) a lone pair of electrons B) a single bond C) a double bond D) a triple bond E) all of the above

E) all of the above

25) Which molecule below would have a Lewis structure that is an exception to the octet rule? A) BH3 B) NO C) SI6 D) PF5 E) all of these

E) all of these

54) Which term matches the definition: The ability of an element to attract electrons within a covalent bond? A) coulombic attraction B) dipole moment C) polar covalent D) nonpolar covalent E) electronegativity

E) electronegativity

11) The Lewis theory predicts that the formula for a compound of magnesium and sulfur is MgS2.

false

15) The structure H=H is a proper representation of the bonding in the H2 molecule.

false

16) The Lewis structure for O2 contains a triple bond.

false

18) The triple bond present in diatomic nitrogen, N2, is what makes this molecule so reactive.

false

19) When calculating the number of electrons for the Lewis structure of a polyatomic ion, subtract one electron for each negative charge.

false

21) The correct Lewis structure for CO2 shows that the carbon atom has two sets of lone pair electrons.

false

23) The sulfate ion contains 28 valence electrons.

false

24) The ammonium ion contains 10 valence electrons.

false

27) Carbon monoxide contains resonance Lewis structures.

false

29) The VSEPR theory predicts that the H-C-H angle in CH4 measures 120°.

false

3) Li : is the proper Lewis structure (dot structure) for lithium.

false

30) It is important to identify lone pairs around a central atom because they do not repel other electron groups.

false

31) The electron geometry of a molecule is never the same as its molecular geometry.

false

33) When you have 4 electron groups and 1 of them is a lone pair, the molecular geometry is bent.

false

34) When you have 4 electron groups and none of them are lone pairs, the molecular geometry is trigonal pyramidal.

false

36) The compound H2S contains polar bonds but the molecule is nonpolar.

false

37) Water and oil do not mix because water molecules are nonpolar and molecules that compose oil are generally polar.

false

4) A chemical bond is classified as a covalent bond if it involves the transfer of electrons.

false

5) The Lewis structure of oxygen should have 8 valence electrons.

false

8) A correct Lewis structure for an atom of carbon would have eight dots surrounding the symbol of the element

false

1) Bonding theories are used to predict how atoms bond together to form molecules.

true

10) Chlorine has 8 valence electrons in the Lewis structure for KCl.

true

12) The Lewis theory predicts that the formula for a compound made of sodium and fluorine is NaF.

true

13) Lewis theory predicts that the formula for a compound made of aluminum and phosphorus is AlP.

true

14) The Lewis structure of water has two sets of lone pair electrons.

true

17) The double bond is shorter and stronger than a single bond.

true

2) Drugs to fight HIV have been developed using bonding theory models.

true

20) The correct Lewis structure for CO2 shows that the molecule contains two double bonds.

true

22) When calculating the number of electrons for the Lewis structure of a polyatomic ion, you must add one electron for each negative charge and subtract one electron for each positive charge.

true

25) Boron forms compounds that violate the octet rule.

true

26) Resonance structures are the best representation we can draw but do not accurately reflect the true structure.

true

28) The VSEPR theory predicts that the angle between the central carbon atom and the two oxygen atoms in CO2 measures 180°

true

32) When you have 2 electron groups and none are lone pairs, the molecular geometry is linear.

true

35) When you have 4 electron groups, the electron geometry is tetrahedral.

true

6) Lewis structures only use the valence electrons in determining the bonding.

true

7) Having eight valence electrons is very stable and is called an octet

true

9) The correct Lewis structure for potassium in KCl is K+.

true