5 Steps to a 5 AP Chemistry

160  Step 4. Review the Knowledge You Need to Score High

11.The only substance listed below that contains
ionic, σ, and πbonds is:

(A) Na 2 CO 3

(B) HClO 2

(C) H 2 O

(D) CO 2

(E) NaCl

For problems, 12–14 choose a molecule from the
following list:

(A) C 2

(B) F 2

(C) B 2

(D) O 2

(E) Ne 2

12.The paramagnetic molecule with a bond order of
two.

13.The diamagnetic molecule with no antibonding
electrons.

14.The paramagnetic molecule with antibonding
electrons.

15.The electron pairs point toward the corners of
which geometrical shape for a molecule with sp^2
hybrid orbitals?

(A) trigonal planar

(B) octahedron

(C) trigonal bipyramid

(D) trigonal pyramid

(E) tetrahedron

16.Regular tetrahedral molecules or ions include
which of the following?

I. CH 4

II. SF 4

III. NH 4 +

(A) I, II, and III

(B) I and III only

(C) I only

(D) I and II only

(E) II only

17.Which molecule or ion in the following list has

the greatest number of unshared electrons around

the central atom?

(A) CF 4

(B) ClF 3

(C) BF 3

(D) NH 4 +

(E) IF 5

18.Which of the following molecules is the least

polar?

(A) PH 3

(B) CH 4

(C) H 2 O

(D) NO 2

(E) HCl

19.What types of hybridization of carbon are in the

compound 1,4-butadiene, CH 2 CHCHCH 2?

I. sp^3

II. sp^2

III. sp

(A) I and II

(B) I, II, and III

(C) I and III

(D) I only

(E) II only

20.Which of the following molecules is the most

polar?

(A) C 2 H 2

(B) N 2

(C) CH 3 I

(D) BF 3

(E) NH 3

21.Which of the following processes involves break-

ing an ionic bond?

(A) H 2 (g) +Cl 2 (g) →2 HCl(g)

(B) I 2 (g) → 2 I(g)

(C) Na(s) → Na(g)

(D) 2 C 2 H 6 (g) + 7 O 2 (g) → 4 CO 2 (g) +

6 H 2 O(g)

(E) 2 KBr(s) →2 K(g) +Br 2 (g)