Download Practice Exam for Chapters 4, 6, 7, 8, 9: Multiple Choice and Short Answer Questions - Pro and more Exams Chemistry in PDF only on Docsity!
CH 221 Practice EXAM Chapters 4, 6, 7, 8, 9
Part I. Multiple Choice. Choose the single best answer to each question and put the letter corresponding to that answer in the space provided. (5 points each, 50 points total.)
- What products result from the addition of aqueous solutions of CuCl 2 and (NH 4 ) 2 S? a. CuS(aq) and NH 4 Cl(s) b. CuS(s) and NH 4 Cl(s) c. CuS(s) and NH 4 Cl(aq) d. CuS(aq) and NH 4 Cl(aq) e. CuS(s), NH 3 (g), and HCl(g)
1) ____________
- The net ionic equation for the acid-base reaction between acetic acid, HC 2 H 3 O 2 , and potassium hydroxide, KOH, is
2) ____________
a. HC H O 2 3 2 ( aq) + KOH ( aq) โ KC H O 2 3 2 ( aq) + H O l 2 ( )
b. H^ +^ (^ aq)^ +^ OH^ โ(^ aq^ )^ โ H O l 2 ( )
c. H +^ ( aq ) + C H O 2 3 2 โ ( aq ) + K +^ ( aq ) + OH โ( aq) โ KC H O 2 3 2 ( aq ) +H O l 2 ( )
d. H +^ ( aq ) + C H O 2 3 2 โ ( aq) + K +^ ( aq) + OH โ^ ( aq) โ K +^ ( aq ) + C H O 2 3 2 โ( aq) + H O l 2 ( )
e. HC H O 2 3 2 ( aq) + OH โ^ ( aq ) โ C H O 2 3 2 โ ( aq) + H O l 2 ( )
- The oxidation number of phosphorus in Na 2 H 2 P 2 O 7 is a. - b. 1 c. 3 d. 4 e. 5
3) ____________
- What is the reducing agent in the following reaction? 4) ____________
6 I โ^ ( aq ) + 2 MnO 4 โ ( aq) + 4 H O l 2 ( ) โ 3 I 2 ( aq ) + 2 MnO 2 ( )s + 8 OH โ( aq)
a. I- b. MnO 4 - c. H 2 O d. MnO 2 e. None of the above
- The green light associated with the aurora borealis is emitted by excited oxygen atoms at 557.7 nm. What is the frequency of this light? (1 nm = 1 x 10-9m) a. 5.38 x 10^12 Hz b. 5.38 x 10^14 Hz c. 5.38 x 10^16 Hz d. 5.38 x 10^18 Hz e. 5.38 x 10^21 Hz
5) ____________
- How many orbitals are there in a sublevel if the โ quantum number is equal to 2? a. 1 b. 3 c. 5 d. 7 e. 9
6) ____________
- Consider the Lewis structure for NH3 ,shown below. The geometry
of NH 3 is best described by
H N H
H
a. 90 o^ bond angles, planar b. 180 o^ bond angles, planar c. 109.5o^ bond angles, tetrahedral d. 109.5o^ bond angles, trigonal pyramid e. 120 o^ bond angles, triangular planar
10)______________
Part II. Problems and Short Answer. You must show reasoning, equations, and set-ups used in order to receive credit for an answer. Fifty (50) points total.
- What volume of 0.550 M HCl is required to react completely with 25. mL of 0.418 M LiOH? (12 points)
11) ____________
- In the following equation, identify the ion or neutral species that is oxidized, and the one reduced, as well as the reducing agent and the oxidizing agent. 3
Bi ( aq) I 2 ( )s 3 H O l 2 ( ) BiO 3 ( aq ) 6 H ( aq ) 2 I ( aq)
___________________is oxidized ___________________is reduced ___________is the reducing agent ___________is the oxidizing agent
- Write electron configurations and orbital diagrams for: (12 points)
Si
Ni+
- a. Draw the Lewis structure for NO 2 -^ (7 points)
b. What is the hybridization of nitrogen in NO 2 -? ( 3 points) 14b) ____________
c. Is NO 2 -^ polar or nonpolar? (3 points) 14c) ____________
