AP Chemistry Topic 1.5-1.8
Quiz
•
Chemistry
•
12th Grade
•
Hard
+1
Standards-aligned
Charles Martinez
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The thermodynamic quantity that expresses the degree of disorder in a system is _
entropy
internal energy
heat flow
enthalpy
bond energy
Tags
NGSS.HS-PS3-4
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which one of the following is always positive when a spontaneous process occurs?
ΔH univ
ΔH surr
ΔS surr
ΔS univ
ΔS sys
3.
MULTIPLE CHOICE QUESTION
30 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
30 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
30 sec • 1 pt
Of the following, the entropy of gaseous __________ is the largest at 25eC and 1 atm.
C2H2
H2
C2H6
CH4
C2H
6.
MULTIPLE CHOICE QUESTION
30 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.
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
For the reaction C2H6 (g) ->C2H4 (g) + H2 (g) ΔHο is +137 kJ/mol and ΔSοis +120 J/mol K. This reaction is
nonspontaneous at all temperatures
unreliable
spontaneous only at high temperature
spontaneous at all temperatures
spontaneous only at low temperature
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-4
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