1. The entropy will usually increase when I. a molecule is broken into two or more smaller molecules. II. a reaction occurs that results in an increase in the number of moles of gas. III. a solid changes to a liquid. IV. a liquid changes to a gas. a. I only b. II only c. III only d. IV only e. I, II, III, and IV
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1. The entropy will usually increase when
I. a molecule is broken into two or more smaller molecules.
II. a reaction occurs that results in an increase in the number of moles of gas.
III. a solid changes to a liquid.
IV. a liquid changes to a gas.
a. I only
b. II only
c. III only
d. IV only
e. I, II, III, and IV
2. For the reaction, A + B → C, ΔHo = +30 kJ; ΔSo = +50 J/K.
Therefore the reaction is:
a. spontaneous at all temperatures.
b. nonspontaneous at all temperatures.
c. spontaneous at temperatures less than 600 K.
d. spontaneous at temperatures greater than 600 K.
e. spontaneous only at 25oC.
3. The
__________.
a. enthalpy
b. internal energy
c. bond energy
d. entropy
e. heat flow
4. A reaction that is spontaneous as written __________.
a. is very rapid
b. will proceed without outside intervention
c. is also spontaneous in the reverse direction
d. has an equilibrium position that lies far to the left
e. is very slow
5. For an isothermal process, ΔS = __________.
a. q
b. qrev/T
c. qrev
d. Tqrev
e. q + w
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