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ACS Gen Chem 2 Final Exam Study Guide, ATI: RN
Comfort, Rest, and Sleep Assessment 2.0 EXAM |
FREQUENTLY TESTED QUESTIONS WITH CORRECT
ANSWERS | BRAND NEW!
A mixture of 100 g of K2Cr2O7 and 200 g of water is stirred at 60 degrees C until
no more of the salt dissolves. The resulting solution is poured off into a separate
beaker, leaving the undissolved solid behind. The solution is now colled to 20
degrees C. What mass of K2Cr2O7 crystallizes from the solution during the
cooling?
(A) 9 g
(B) 18 g
(C) 31 g
(D) 62 g ......ANSWER......D
Carbonated beverages have a fizz because of gas dissolved in the solution. What
increases the concentration of gas in a solution?
(A) cooling the solution
(B) heating the solution
(C) increasing the volume of solution
(D) decreasing the volume of solution ......ANSWER......A
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the
freezing point was lowered by 6.36 degrees C. What is the identity of this
unknown compound?
pg. 1
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Kf for water = 1.86 degrees C/m
(A) CsCl
(B) KCl
(C) LiF
(D) NaCl ......ANSWER......D
Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl ......ANSWER......A
What is the rate law of this reaction?
2H2 (g) + 2NO (g) --> N2 (g) + 2H2O (g)
(A) rate = k[H2]^2 [NO]
(B) rate = k[H2] [NO]^2
(C) rate = k[H2]^2 [NO]^2
(D) rate = k[N2] [H2O]^2 / [H2]^2 [NO]^2 ......ANSWER......B
The rate law for the reaction
A + B --> C + D
pg. 2
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is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled,
the rate of the reaction will
(A) remain the same
(B) be increased by a factor of 2
(C) be increased by a factor of 4
(D) be increased by a factor of 8 ......ANSWER......B
The half-life for the first order conversion of cyclobutene to ethylene,
C4H8 (g) --> 2C2H4 (g)
is 22.7 s at a particular temperature. How many seconds are needed for the
partial pressure of cyclobutane to decrease from 100 mmHg to 10 mmHg?
(A) 0.101 s
(B) 52.0 s
(C) 75.5 s
(D) 5233 s ......ANSWER......C
The half-life for the first-order radioactive decay of 32P is 14.3 days. How many
days would be required for a sample of a radio pharmaceutical containing 32P to
decrease to 20.0% of its initial activity?
(A) 33.0 d
(B) 49.2 d
(C) 71.0 d
(D) 286 d ......ANSWER......A
pg. 3
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Plots are shown for the reaction N02 (g) --> NO (g) + 1/2 O2 (g)
What is the rate law for the reaction?
(A) rate = k
(B) rate = k x 1/[NO2]
(C) rate = k[NO2]
(D) rate = k[NO2]^2 ......ANSWER......D
What changes when a catalyst is added to the reaction described by this energy
diagram?
(A) I and II
(B) I and III
(C) I only
(D) III only ......ANSWER......A
Which statement regarding chemical reactions is true according to collision
theory?
(A) All molecular collisions result in chemical equations.
(B) Catalysts make individual collisions more effective, increasing reaction rates.
(C) Proper orientation of molecules is required for collision to result in chemical
reactions.
pg. 4
ACS Gen Chem 2 Final Exam Study Guide, ATI: RN
Comfort, Rest, and Sleep Assessment 2.0 EXAM |
FREQUENTLY TESTED QUESTIONS WITH CORRECT
ANSWERS | BRAND NEW!
A mixture of 100 g of K2Cr2O7 and 200 g of water is stirred at 60 degrees C until
no more of the salt dissolves. The resulting solution is poured off into a separate
beaker, leaving the undissolved solid behind. The solution is now colled to 20
degrees C. What mass of K2Cr2O7 crystallizes from the solution during the
cooling?
(A) 9 g
(B) 18 g
(C) 31 g
(D) 62 g ......ANSWER......D
Carbonated beverages have a fizz because of gas dissolved in the solution. What
increases the concentration of gas in a solution?
(A) cooling the solution
(B) heating the solution
(C) increasing the volume of solution
(D) decreasing the volume of solution ......ANSWER......A
When 100 g of an unknown compound was dissolved in 1.00 kg of water, the
freezing point was lowered by 6.36 degrees C. What is the identity of this
unknown compound?
pg. 1
,2|Page
Kf for water = 1.86 degrees C/m
(A) CsCl
(B) KCl
(C) LiF
(D) NaCl ......ANSWER......D
Which 0.1 molal aqueous solution will have the lowest freezing point?
(A) Al(NO3)3
(B) CaCl2
(C) C2H5OH
(D) NaCl ......ANSWER......A
What is the rate law of this reaction?
2H2 (g) + 2NO (g) --> N2 (g) + 2H2O (g)
(A) rate = k[H2]^2 [NO]
(B) rate = k[H2] [NO]^2
(C) rate = k[H2]^2 [NO]^2
(D) rate = k[N2] [H2O]^2 / [H2]^2 [NO]^2 ......ANSWER......B
The rate law for the reaction
A + B --> C + D
pg. 2
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is first order in [A] and second order in [B]. If [A] is halved and [B] is doubled,
the rate of the reaction will
(A) remain the same
(B) be increased by a factor of 2
(C) be increased by a factor of 4
(D) be increased by a factor of 8 ......ANSWER......B
The half-life for the first order conversion of cyclobutene to ethylene,
C4H8 (g) --> 2C2H4 (g)
is 22.7 s at a particular temperature. How many seconds are needed for the
partial pressure of cyclobutane to decrease from 100 mmHg to 10 mmHg?
(A) 0.101 s
(B) 52.0 s
(C) 75.5 s
(D) 5233 s ......ANSWER......C
The half-life for the first-order radioactive decay of 32P is 14.3 days. How many
days would be required for a sample of a radio pharmaceutical containing 32P to
decrease to 20.0% of its initial activity?
(A) 33.0 d
(B) 49.2 d
(C) 71.0 d
(D) 286 d ......ANSWER......A
pg. 3
, 4|Page
Plots are shown for the reaction N02 (g) --> NO (g) + 1/2 O2 (g)
What is the rate law for the reaction?
(A) rate = k
(B) rate = k x 1/[NO2]
(C) rate = k[NO2]
(D) rate = k[NO2]^2 ......ANSWER......D
What changes when a catalyst is added to the reaction described by this energy
diagram?
(A) I and II
(B) I and III
(C) I only
(D) III only ......ANSWER......A
Which statement regarding chemical reactions is true according to collision
theory?
(A) All molecular collisions result in chemical equations.
(B) Catalysts make individual collisions more effective, increasing reaction rates.
(C) Proper orientation of molecules is required for collision to result in chemical
reactions.
pg. 4
