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Ch. 12 & 14 bonds & IMF test [60 points] Honors Chemistry

1. Sketch the molecule’s shape; name of molecule’s geometry / shape; and bond angle(s). [10 points]

a. IF₃

b. IF₅

2. Draw all valid Lewis structures of ___. [10 points]

a. NO₃ ^-

b. SiO₂

3. Use Lewis symbols to show the bonds in a compound containing aluminum and oxygen. Identify the type of bond in the compound. [hint: chemical formula is NOT AlO; 10 points]

4. Why does it take longer to cook food on a mountain top than at sea level ? [10 points]

5. Arrange the following atoms in ascending order (i.e. small to big) in terms of their electronegativity: arsenic, chlorine, phosphorus. [6 points]

SAT II format questions: answer sheet [14 points]

6. ______ 7. _____ 8. _____ 9. _____

II CE*

10. ___ ___

T F

___ ___ ___

T F

11. ___ ___

T F

___ ___ ___

T F

12. ___ ___

T F

___ ___ ___

T F

Score = 2 * { ____ - 0.25 * _____ } = _____ points

# correct # wrong

Part A

Directions: Each set of lettered choices below refers to the numbered formulas or statements immediately following it. Select the one lettered choice that best fits each formula or statement; then put your answer in the answer sheet. In each set, a choice may be used once, more than once, or not at all.

Questions 6 – 9

a. hydrogen bond IMF

b. dipole – dipole IMF

c. London dispersion IMF

d. chemical bond

e. none of the above

6. Water has ___.

7. Carbon dioxide has ___.

8. The strongest type of IMF is ___.

9. The Na⁺ in a solution of NaCl (dissolved in water) has ___.

Part B

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, put a “x” in the corresponding T or F blank on your answer sheet. Put a “x” under CE only if statement II is a correct explanation of statement I.

I		II
10. CO₂ has a higher vapor pressure than H₂O	BECAUSE	CO₂ has a stronger IMF than H₂O
11. CS₂ has a lower boiling point than NH3	BECAUSE	CS₂ has a weaker IMF than NH₃
12. The C – Cl bond is more polar than the C – Br bond	BECAUSE	Cl is more electronegative than Br