Spontaneity

Quiz
•
Science
•
1st Grade
•
Hard
+1
Standards-aligned
Charles Martinez
FREE Resource
25 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
2.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
The thermodynamic quantity that expresses the degree of disorder in a system is _
entropy
internal energy
heat flow
enthalpy
bond energy
3.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
ΔS will be positive for the reaction
2H2 (g) + O2 (g) -> 2H2O (g)
2NO2 (g) -> N2O4 (g)
BaF2 (s) ->Ba2+ (aq) + 2F- (aq)
2Hg (l) + O2 (g) ->2HgO (s)
4.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
Which one of the following processes produces a decrease in the entropy of the system?
dissolution of solid KCl in water
mixing of two gases into one container
freezing water to form ice
melting ice to form water
5.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
What can be said about a chemical system that has reached a minimum in free energy?
The system has achieved equilibrium.
The reaction is complete.
The system entropy is zero.
The reaction is very fast.
6.
MULTIPLE CHOICE QUESTION
45 sec • 1 pt
For the reaction C2H6 (g) ->C2H4 (g) + H2 (g) ΔHο is +137 kJ/mol and ΔDSοis +120 J/K œ mol. This reaction is
nonspontaneous at all temperatures
unreliable
spontaneous only at high temperature
spontaneous at all temperatures
spontaneous only at low temperature
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
A reaction that is not spontaneous at low temperature can become spontaneous at high temperature if ΔH is __________ and ΔS is __________.
+, +
-, -
+, -
-, +
+, 0
Tags
NGSS.HS-PS1-4
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