CHE PHYSICAL C Assessment Chapter Test B Teacher Notes and Answers

Name:______________________________Class: _________________ Date: _________________

Assessment

Chapter Test B
Teacher Notes and Answers
18 Chemical Equilibrium
TEST B
1. a 23. changes in concentration, changes in
2. b pressure, changes in temperature
3. d 24. If a product is precipitated as a solid; if a
4. b gaseous product forms and escapes; if a
5. b soluble product is only slightly ionized
6. c 25. none
7. a 26. reverse reaction is favored
8. basic 27. forward reaction is favored
9. 2H 2 O (l ) 
H 3 O + (aq ) + OH
(aq ) 28. neutral

29. acidic
10. dissolved ions
30. basic
11. dynamic
31. neutral
12. K = [Ag+ ][Cl
] 32. acidic
13. common-ion effect
33. effective buffer
14. remains nearly constant
34. ineffective buffer
15. equal to
35. ineffective buffer
16. denominator
36. effective buffer
[ NH +4 ][OH
] 37. 0.20
17. K =
[ NH 3 ] 38. 3.5
18. exothermic 39. 1.79  10
3 mol/L
19. gas phase or gas state 40. 1.2  10
8
20. anion hydrolysis 41. 5.3  10
1 7 mol/L
21. buffered 42. 6.0  10
1 1 ; no

22. K a =
[H 3 O + ][A
]
[HA]




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Modern Chemistry 1 Chapter Test
https://www.coursehero.com/file/151486472/hssc1800t-chaptest-bpdf/

, Name:______________________________Class: _________________ Date: _________________

Assessment

Chapter Test B
Chapter: Chemical Equilibrium
PART I In the space provided, write the letter of the term or phrase that best
completes each statement or best answers each question.
_____ 1. What is the effect on concentration if more CO(g) is added to the
following equilibrium system?
2CO( g ) + O 2 ( g ) 

2CO 2 ( g )

a. [CO2] increases and [O2] decreases.
b. Both [CO2] and [O2] increase.
c. Both [CO2] and [O2] decrease.
d. Both [CO2] and [O2] remain the same.
_____ 2. Consider the following equation for the ionization of acetic acid:
CH 3 COOH(aq ) + H 2 O(l )  +

 H 3 O ( aq ) + CH 3 COO ( aq )

_____ What is the equation for the acid ionization constant, Ka, for this
system?
a. [H3O+ ][CH3COO
]
[H 3 O + ][CH 3 COO
]
b.

[H 3 O + ][CH 3 COO
]
c.

[CH 3 COOH]
d.
[H 3 O + ][CH 3 COO
]
_____ 3. Adding the salt of a weak base to a solution of the weak base
a. lowers the concentration of the nonionized base and of OH
.
b. lowers the concentration of the nonionized base and raises the
concentration of OH
.
c. raises the concentration of the nonionized base and of OH
.
d. raises the concentration of the nonionized base and lowers the
concentration of OH
.
_____ 4. A very high value for K indicates that
a. reactants are favored.
b. products are favored.
c. equilibrium is reached slowly.
d. equilibrium has been reached.




Original
This study source was content Copyright
downloaded © by Holt, Rinehart
by 100000899606070 fromandCourseHero.com
Winston. Additionson
and09-29-2025
changes to the original GMT
12:46:54 content-05:00
are the responsibility of the instructor.
Modern Chemistry 2 Chapter Test
https://www.coursehero.com/file/151486472/hssc1800t-chaptest-bpdf/