NEW
Font size
WorksheetsAP Chemistry Thermodynamics Test Review
Total questions: 60
Worksheet time: 1hrs 20mins
Which change is exothermic?
negative delta H
heat is absorbed by system
temperature decreases
bubbles form
Which is exothermic?
temperature decreases
heat is released by system
liquid changes to gas
products are at higher energy than reactants
which is exothermic?
temperature decreases
breaking bonds
system releasing heat to surroundings
chemical reaction
Which is NOT endothermic
positive delta H
heat is a reactant
heat is right of arrow
bonds breaking
which is endothermic?
IMFs broken
negative delta H
products are lower energy than reactants
temperature increases
Which is endothermic?
bonds formed
phase change gas --> liquid
temperature increases
positive delta H
Which change is the MOST exothermic?
condensing
vaporizing
fusion
solidification
Which changes is the MOST endothermic?
Condensing
Vaporizing
Fusion
Solidification
Which substance would be able to absorb the most energy if each sample experiences the same temperature change?
50 grams of aluminum
5 grams of aluminum
150 grams of aluminum
1000 gram of aluminum
Which substance would experience the biggest temperature change if each sample absorbed the same energy?
100 grams of water
25 grams of water
5 grams of water
2500 grams of water
heat released
exothermic
endothermic
bonds broken
exothermic
endothermic
temperature increases
exothermic
endothermic
products have lower potential energy than reactants
exothermic
endothermic
condensing
exothermic
endothermic
bonds form
exothermic
endothermic
negative delta H
exothermic
endothermic
2NaCl + 35 kJ --> 2Na + Cl2
exothermic
endothermic
positive delta H
exothermic
endothermic
temperature decreases
exothermic
endothermic
The specific heat of liquid bromine is 0.2 J/gK. How much heat is required to raise the temperature of 100. grams of bromine from 15 K to 25 K?
30 J
500 J
20 J
200 J
The specific heat of liquid bromine is 0.20 J/gK. What is the MOLAR heat capacity of this substance?
32 J/gK
16 J/gK
9.0 J/gK
0.23 J/gK
What is the FINAL temperature of a 10.0 gram sample of water, at 25 C, if it absorbs 100 calories of heat? Specific heat of water is 1 calorie/gC
15
25
35
25,000
The specific heat of water is 1 calorie/g C. What is the molar heat capacity?
18 calorie/mol C
0.056 calorie/mol C
4.2 calorie/mol C
76 calorie/mol C
How much heat is released when 36 grams of water is frozen at 0 C? The heat of solidification is 6.02 kJ/mol.
18 kJ
220 kJ
12 kJ
2 kJ
What is the heat of fusion, in kJ/g, if 150 gram sample absorbs 750 kJ when it melts at a constant temperature?
900 kJ/g
0.20 kJ/g
110,000 kJ/g
5.0 kJ/g
Which phase change would have the most negative value for the same substance?
heat of fusion
heat of solidification
heat of vaporization
heat of condensation
The enthalpy change for 2Na + Cl2 --> 2NaCl is -35 kJ. What is the heat of reaction for 2NaCl --> 2Na + Cl2
- 35 kJ
35 kJ
70 kJ
- 70 kJ
The heat of reaction for 2H2 + O2 --> 2H2O is -40 kJ. What is the heat of reaction for H2O --> H2 + 1/2 O2?
- 40 kJ
20 kJ
- 80 kJ
80 kJ
2H2O + 25 kJ --> 2H2 + O2 How much energy is absorbed when 36 grams of water is decomposed?
25 kJ
50 kJ
12.5 kJ
900 kJ
How much heat is released when 3 moles of methane is reacted? CH4 + O2 --> CO2 + H2O + 80 kJ
1300 kJ
0.038 kJ
27 kJ
240 kJ
4500 kJ of energy was produced. How many moles of oxygen were created? 2CO2 --> 2CO + O2 + 100 kJ
4400 moles
32 moles
45 moles
2.2 moles
What is the heat capacity for 50 grams of copper if the specific heat is 0.3 J/gC?
6.0 J/C
170 J/C
15 J/C
64 J/C
Which would have the highest heat capacity?
50 grams of Al, Cp = 4.7 J/gK
50 grams of H2O, Cp = 4.2 J/gK
50 grams C, Cp = 0.78 J/gK
50 grams of Cu, Cp = 0.39 J/gK
Which has the HIGHEST entropy change?
1 --> 2 particles
gas --> liquid
solid --> gas
low to high temperature (same phase)
Entropy is always ________ in the Universe
increasing
decreasing
constant
Which is a positive sign for S
decrease in entropy
solidification
1 --> 2 particles
decreasing volume for a gas
Which has a negative sign for S?
water evaporating
NaCl dissolving in water
water freezing
sublimation of CO2
Which has a positive sign for S?
2Na (s) + Cl2 (g) --> 2NaCl (s)
H2O (g) --> H2O (l)
H+ (aq) + NO3- (aq) --> HNO3 (l)
CaCl2 (s) --> Ca2+ (aq) + 2Cl- (aq)
C2H6 (g) --> C2H4 (g) + H2 (g)
+ delta S
- delta S
water turning into steam
+ delta S
- delta S
a mixture of gases is separated into 2 different containers
+ delta S
- delta S
reaction is spontaneous
- delta G
+ delta G
reaction is ALWAYS spontaneous
- H, - S
+ H, + S
+ H, - S
- H, + S
reaction is NEVER spontenous
exothermic, decrease in entropy
exothermic, increase in entropy
endothermic, decrease in entropy
endothermic, increase in entropy
spontaneous reaction means
reaction is fast
reaction occurs
reaction is exothermic
delta G is positive
a reaction that is exothermic and has a decrease in entropy is
spontaneous at high temps
spontaneous at low temps
always spontaneous
never spontaneous
a reaction that is exothermic and has an increase of entropy
is spontaneous at high temps
is spontaneous at low temps
is always spontaneous
is never spontaneous
enthalpy is
H
G
S
E
entropy is
H
S
G
E
enthalpy is driving force when
exothermic
endothermic
increase in entropy
decrease in entropy
entropy is the driving force when
exothermic
endothermic
entropy increasing
entropy decreasing
endothermic and decrease in entropy is spontaneous at
high temps
low temps
never spontaneous
always spontaneous
If a reaction occurs, then delta G is
negative
positive
can't tell
0
An endothermic reaction that experiences an increase in entropy is
always spontaneous
never spontaneous
spontaneous at HIGH temps
spontaneous at LOW temps
an exothermic reaction is not spontaneous at high temps. what can you say about entropy?
negative S
positive S
How can you make an enthalpy driven reaction spontaneous?
You can't
increase temps
decrease temps
it's always spontaneous
How can you make an entropy driven reaction spontaneous?
increase temps
decrease temps
you can't
it's always spontaneous
What are the signs on G, H, and S if a solid is combined with another solid, a gas forms and the temperature drops?
+, +, +
- , - , -
- ,+, +
+ , +, -
What is the driving force of a reaction that has a + H and a + S?
temperature
enthalpy
entropy
this reaction is never spontaneous
