Honors Chemistry Quiz Chapters 9 & 10

Name: ______Period: ____ Date: ______This quiz is worth 64 points; each correct response is 2 points. Only those quizzes completed in black ink will be graded. Good luck!

1) Which of the following statements is TRUE? A) A covalent bond is formed through the transfer of electrons from one atom to another. B) A pair of electrons involved in a covalent bond are sometimes referred to as "lone pairs." C) It is not possible for two atoms to share more than two electrons. D) Single bonds are shorter than double bonds. E) A covalent bond has a lower potential energy than the two separate atoms.

2) Which of the following statements is TRUE? A) An ionic bond is much stronger than most covalent bonds. B) An ionic bond is formed through the sharing of electrons. C) Ionic compounds at room temperature typically conduct electricity. D) Once dissolved in water, ionic compounds rarely conduct electricity. E) None of the above are true.

3) Which of the following represent the Lewis structure for Mg? A) B) C) D) E)

4) Which of the following represent the Lewis structure for S2-? A) B) C) D) E)

5) Use Lewis theory to determine the chemical formula for the compound formed between Rb and S. A) RbS B) RbS2 C) Rb2S D) Rb2S3 E) Rb3S2

1 6) Which of the following reactions is associated with the lattice energy of RbI (ΔH°latt)? 1 A) Rb(s) + I2(g) → RbI(s) 2 B) RbI(s) → Rb+(g) + I-(g) 1 C) RbI(s) → Rb(s) + I2(g) 2 D) RbI(s) → Rb+(aq) + I-(aq)

E) Rb+(g) + I-(g) → RbI(s)

7) Place the following in order of decreasing magnitude of lattice energy.

K2O Rb2S Li2O

A) Li2O > K2O > Rb2S B) Li2O > Rb2S > K2O C) Rb2S > K2O > Li2O D) Rb2S > Li2O > K2O E) K2O > Li2O > Rb2S

8) Choose the compound below that should have the lowest melting point according to the ionic bonding model. A) LiF B) NaCl C) CsI D) KBr E) RbI

9) Give the complete electronic configuration for Br-. A) 1s22s22p63s23p64s24p6 B) 1s22s22p63s23p64s24d104p6 C) 1s22s22p63s23p64s23d104p6 D) 1s22s22p63s23p64s23d104p5 E) 1s22s2p63s2p64s23d104p6

10) A triple covalent bond contains ______of electrons. A) 0 pairs B) 1 pair C) 2 pairs D) 3 pairs E) 4 pairs

2 11) Place the following elements in order of decreasing electronegativity.

S Cl Se A) Se > S > Cl B) Cl > Se > S C) Se > Cl > S D) S > Cl > Se E) Cl > S > Se

12) Choose the bond below that is least polar. A) P-F B) C-Br C) C-F D) C-I E) C-Cl

13) Using periodic trends, place the following bonds in order of decreasing ionic character.

Sb-Cl P-Cl As-Cl

A) Sb-Cl > As-Cl > P-Cl B) As-Cl > Sb-Cl > P-Cl C) Sb-Cl > P-Cl > As-Cl D) P-Cl > As-Cl > Sb-Cl E) Sb-Cl > P-Cl > As-Cl

14) Which molecule or compound below contains a polar covalent bond? A) C2H4 B) ZnS C) LiI D) NCl3 E) AgCl

15) Choose the best Lewis structure for OCl2. A) B) C) D) E)

3 16) Choose the best Lewis structure for XeI2. A) B) C) D) E)

17) Choose the best Lewis structure for BF3. A)

18) Give the approximate bond angle for a molecule with a tetrahedral shape. A) 109.5° B) 180° C) 120° D) 105° E) 90°

4 19) Determine the electron arrangement (ea) and molecular geometry (mg) of CO32-. A) ea=tetrahedral, mg=tetrahedral B) ea=tetrahedral, mg=trigonal pyramidal C) ea=trigonal planar, mg=bent D) ea=trigonal planar, mg=trigonal planar E) ea=tetrahedral, mg=trigonal planar

20) Consider the molecule below. Determine the molecular geometry at each of the 2 labeled carbons.

A) C1 = tetrahedral, C2 = linear B) C1 = trigonal planar, C2= bent C) C1 = bent, C2 = trigonal planar D) C1 = trigonal planar, C2 = tetrahedral E) C1 = trigonal pyramidal, C2 = see-saw

21) Place the following in order of decreasing X-A-X bond angle, where A represents the central atom and X represents the outer atoms in each molecule.

CS2 CF4 SCl2

A) CS2 = SCl2 > CF4 B) SCl2 > CF4 > CS2 C) CF4 > CS2 > SCl2 D) CS2 > CF4 > SCl2 E) CF4 > CS2 > SCl2

22) How many of the following molecules are polar?

XeCl2 COF2 PCl4F SF6

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

5 23) Determine the electron arrangement, molecular geometry and polarity of HBrO2 . A) ea=trigonal bipyramidal, mg=trigonal planar, nonpolar B) ea=octahedral, mg=square planar, nonpolar C) ea=tetrahedral, mg=trigonal pyramidal, polar D) ea=tetrahedral, mg=linear, nonpolar E) ea=linear, mg=linear, polar

24) Choose the compound below that contains at least one polar covalent bond, but is nonpolar. A) HCN B) CF4 C) SeBr4 D) ICl3 E) Both B and C are nonpolar and contain a polar covalent bond.

25) Describe a sigma bond. A) side by side overlap of p orbitals B) end to end overlap of p orbitals C) s orbital overlapping with the side of a p orbital D) overlap of two s orbitals E) p orbital overlapping with a d orbital

26) A molecule containing a central atom with sp2 hybridization has a(n) ______electron geometry. A) linear B) trigonal bipyramidal C) trigonal planar D) tetrahedral E) bent

27) A molecule containing a central atom with sp3d2 hybridization has a(n) ______electron geometry. A) octahedral B) trigonal bipyramidal C) tetrahedral D) trigonal planar E) trigonal pyramidal

6 28) Draw the Lewis structure for SO3. What is the hybridization on the S atom? A) sp B) sp3 C) sp2 D) sp3d E) sp3d2

29) Draw the Lewis structure for BrCl3. What is the hybridization on the Br atom? A) sp3d2 B) sp3d C) sp3 D) sp2 E) sp

30) How many of the following molecules have sp3 hybridization on the central atom?

XeCl4 CH4 SF4 C2H2

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

31) List the number of sigma bonds and pi bonds in a triple bond. A) 1 sigma, 1 pi B) 2 sigma, 1 pi C) 2 sigma, 2 pi D) 1 sigma, 2 pi E) 1 sigma, 0 pi

32) How many of the following molecules contain at least one pi bond?

C2H6 Cl2CO C2Cl4 SeS3

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