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- 1. Multiple Choice
What is the symbol for entropy?
H
G
S
E
- 2. Multiple Choice
Which represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
- 3. Multiple Choice
Which represents a -ΔS?
ice melting
salt dissolving
water heating up
none of these
- 4. Multiple Choice
Which of the following scenarios describes a process with a negative entropy change?
Building a skyscraper
A clean room becomes cluttered
An igloo melting
Osmosis (I hope you know your Biology!)
- 5. Multiple Choice
Which of these have a DECREASE in entropy?
CaCO3(s) → CaO(s) + CO2(g)
2NO2(g) → N2O4(g)
2NH3(g) → 3H2(g) + N2(g)
C6H6(l) → C6H6(g)
- 6. Multiple Choice
The entropy will usually increase when
a molecule is broken into two or more smaller molecules
a reaction occurs that results in an increase in the number of moles of gas
a solid changes to a liquid
all of these
- 7. Multiple Choice
Which combination of ΔH and ΔS always has a spontaneous reaction?
+ΔH and +ΔS
+ΔH and -ΔS
-ΔH and -ΔS
-ΔH and +ΔS
- 8. Multiple Choice
Which combination of ΔH and ΔS NEVER has a spontaneous reaction?
+ΔH and +ΔS
+ΔH and -ΔS
-ΔH and -ΔS
-ΔH and +ΔS
- 9. Multiple Choice
Ammonium nitrate dissolves in water. It is a spontaneous endothermic process because the system undergoes....
a decrease in enthalpy
an increase in entropy
an increase in enthalpy
a decrease in entropy
- 10. Multiple Choice
Which has a +ΔS (system)?
AgNO3(aq) + NaCl(aq) → AgCl(s) + NaNO3(aq)
H2O(g) + CO2(g) → H2CO3(aq)
H2(g) + I2(g) → 2Hl(g)
C2H2O2(g) → 2CO(g) + H2(g)
- 11. Multiple Choice
Systems in nature tend to undergo changes toward
lower energy and less disorder
lower energy and more disorder
higher energy and less disorder
higher energy and more disorder
- 12. Multiple Choice
Which sample has the lowest entropy?
1 mole of KNO3(l)
1 mole of KNO3(s)
1 mole of H2O(l)
1 mole of H2O(g)
- 13. Multiple Choice
Predict the entropy change and its spontaniety
ΔS = +ve and non spontaneous
ΔS = -ve and spontaneous
ΔS = -ve and non spontaneous
ΔS = +ve and spontaneous
- 14. Multiple ChoiceA reaction has a positive ΔH and a positive ΔS. Which of the following is true?It will be spontaneous at all temperatures.It will be nonspontaneous at all temperatures.It will be spontaneous at low temperatures.It will be spontaneous at high temperatures.
- 15. Multiple Choice
What is a spontaneous process ?
slow process
fast process
process that needs an external intervention to occur
process that does not need external intervention to occur / keep happening
- 16. Multiple Choice
A reaction that releases energy is
Exothermic
Endothermic
Could be either
- 17. Multiple Choice
A reaction that absorbs energy is
Exothermic
Endothermic
Could be either
- 18. Multiple ChoiceSpontaneity is determined by....enthalpy onlyentropy onlyenthalpy and entropyenthalpy, entropy, and temperature
- 19. Multiple ChoiceSpontaneous reactions may be extremely slow.TrueFalse
- 20. Multiple ChoiceReactions tend to be spontaneous if they are exothermic.TrueFalse
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