4. Rank these molecules with respect to the increasing oxidation number of the c
ID: 773999 • Letter: 4
Question
4. Rank these molecules with respect to the increasing oxidation number of the carbon atom: formic acid (HCOOH); methane (CH4); methanol (CH3OH); carbon dioxide (CO2); graphite(C).
a.
formic acid; carbon dioxide; methanol; methane; graphite
b.
methanol; methane; graphite; carbon dioxide; formic acid
c.
methane; methanol; graphite; formic acid; carbon dioxide
d.
carbon dioxide; formic acid; graphite; methanol; methane
e.
The oxidation number of carbon is the same in all of these compounds.
5. Which of the following processes are spontaneous?
I.
Iron in the open air rusts.
II.
Liquid water in a freezer turns to ice.
III.
A spark ignites a mixture of propane and air.
a.
I only
d.
II and III only
b.
I and II only
e.
I, II, and III are all spontaneous.
c.
I and III only
6. During a spontaneous chemical reaction, it is found that ?Ssys < 0. This means __________
a.
?Ssurr < 0 and its magnitude is < ?Ssys.
b.
?Ssurr < 0 and its magnitude is > ?Ssys.
c.
?Ssurr > 0 and its magnitude is < ?Ssys.
d.
?Ssurr > 0 and its magnitude is > ?Ssys.
e.
an error has been made, as Ssys > 0 by necessity for a spontaneous process.
Heat
7. Heat transfer from the system to the surroundings has a large effect on ?Ssurr ___________
a.
when the temperature of the surroundings is low.
b.
when the temperature of the surroundings is high.
c.
when the temperature of the system is low.
d.
when the temperature of the system is high.
e. at any temperature as the amount of heat transferred is independent of temperature.
8. What is the entropy change to the surroundings when 1 mol of ice melts in someone
a.
formic acid; carbon dioxide; methanol; methane; graphite
b.
methanol; methane; graphite; carbon dioxide; formic acid
c.
methane; methanol; graphite; formic acid; carbon dioxide
d.
carbon dioxide; formic acid; graphite; methanol; methane
e.
The oxidation number of carbon is the same in all of these compounds.
Explanation / Answer
4. b
5. d
6. a
7. c
8. a
9. b
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