Ch. 11 & 12 atomic structure & bonds test [50 points] Honors Chem

SAT II Chemistry format questions. Put your answer in the below answer sheet; no credit for answers written at another location. [12 points]

1. ______ 3. ______ 5. ____________________

2. ______ 4. ______ 6. ____________________

Score = _____ = [ ______ * 2] - [ _______ * 0.5]

# correct # incorrect

Part A

Directions. Each set of lettered choices below refers to the numbered statements or formulas immediately following it. Select the one lettered choice that best fits each statement or formula. A choice may be used once, more than once, or not at all in each set.

Questions 1 – 2.

a. linear

b. bend

c. trigonal planar

d. trigonal pyramidal

e. tetrahedral

1. shape of NH₃ is __.

2. shape of BH₃ is __.

Part B

Directions: Each of the incomplete statements or questions below is followed by five suggested completions or answers. Select the one that is best for each case.

3. The central atom in NH₃ has ___ hybrid orbital.

a. sp²

b. sp³

c. sp⁴

d. sp³d

e. none of the above

4. The central atom in SeH₂ has ___ bonding pair and __ nonbonding pair of electrons.

a. 2, 0

b. 2, 1

c. 2, 2

d. 2, 3

e. 2, 4

Part C

Directions: Each question below consists of two statements, statement I in the left-hand column and statement II in the right-hand column. For each question, determine whether statement I is true or false and whether statement II is true or false. Then mark the corresponding T or F blank on your answer sheet. Fill in CE only if statement II is a correct explanation of statement I.

Statement I = T	Statement I = F	Statement II = T	Statement II = F	CE
select: “a”	select: “b”	select: “c”	select: “d”	select: “e”

I		II
5. Ionization energy is the energy to change an atom to an ion	BECAUSE	the removal of an electron requires energy.
6. Valence electrons are involved in the formation of chemical bonds	BECAUSE	valence electrons are located in the outer-most shell of electrons.

7. Draw the orbital diagram of ___. [6 points]

a. bismuth:

b. sulfur:

8. fill-in the below table. [11 points]

# bonding pair of electrons	# nonbonding pair of electrons	Name of molecule’s shape	Bond angle(s)	Sketch molecule
		T - shape
			109 °
4	2

 

9. ___ has the larger atomic size. Justify your answer. [10 points]

a. Al versus Tl

b. Al versus S

10. Use valence bond theory to describe all bonds in PH 3. If hybrid orbitals are involved, then [11 points]

• rationalize the need for a hybrid orbital
• rationalize the need for that specific hybrid orbital
• describe its formation