Q4 General Chemistry 2 Summative Test
Quiz by HEIDI LIZA DE MESA
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- Q1
In which of the following physical states does a given substance have the highest entropy?
gas
liquid
solid
The entropy is the same because the same substance is involved.
60s - Q2
Which of the following describes an endergonic reaction?
is spontaneous
must be endothermic
must correspond to a decrease in entropy
is nonspontaneous
60s - Q3
What are the two factors that determine whether a reaction is spontaneous or nonspontaneous?
energy and the heat of reaction
entropy and disorder
electron configuration and change
entropy and enthalpy change
60s - Q4
In which of these systems is the entropy decreasing?
salt dissolving in water
air escaping from a tire
gas condensing to a liquid
snow melting
60s - Q5
Which of the following refers to all spontaneous processes?
release free energy
involve an increase in entropy
are exothermic
are endothermic
60s - Q6
What is the expression for Keq for this reaction?
2H20(g) → 2H2(g)+ 02(g)
Keq = [2H20]
[H2] [02]
Keq = [2H2][02]
2[H20]
Keq = [H2]2 [02]
[H20]2
Keq = [H20]2
[H2]2 [02]
60s - Q7
In an equilibrium reaction with a Keq of 1 x 108, which of the following is true?
reaction is nonspontaneous
reactants are favored
reaction is exothermic
products are favored
60s - Q8
What is the effect of adding more CO2 to the following equilibrium reaction?
CO2 + H2O → H2CO3
More H2O is produced.
Nothing
More H2CO3 is produced.
The equilibrium is pushed in the direction of reactants.
60s - Q9
Doing which of the following generally increases the entropy of a substance?
freezing it
condensing it
dissolving it in water
all of the above
60sSTEM_GC11CTIVa-b-140 - Q10
The Keq of a reaction is 4 x 10-7. At equilibrium:
the reactants are favored.
the rate of the reverse reaction is much greater than the rate of the forward reaction.
the reactants and products are present in equal amounts.
the products are favored.
60sSTEM_GC11CEIVb-e-148 - Q11
Two opposing reactions (A + B ⇄ C + D) occurring simultaneously at the same rate is an example of:
A. reversibility
A and B
B. chemical equilibrium
neither A nor B
60sSTEM_GC11CEIVb-e-145 - Q12
Exergonic reactions:
release free energy.
are nonspontaneous.
do not produce energy that can be used to do useful work.
all of the above
60sSTEM_GC11CTIVa-b-143 - Q13
A reaction is most likely to be spontaneous when during the course of a reaction -
the energy content and the entropy both decrease.
the energy content and the entropy both increase.
the energy content decreases and the entropy increases.
the energy content increases and the entropy decreases.
60sSTEM_GC11CTIVa-b-140 - Q14
The amount of disorder in a system is measured by its:
equilibrium position
Keq
entropy
activation energy
60sSTEM_GC11CTIVa-b-140 - Q15
On a cold day water vapor condenses to form frost. This represents an:
entropy increase and enthalpy decrease
entropy increase and enthalpy increase
entropy decrease and enthalpy increase
entropy decrease and enthalpy decrease
60sSTEM_GC11CTIVa-b-140