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- 1. Multiple Choice
What is the symbol for entropy?
H
G
S
E
- 2. Multiple Choice
Entropy is a measure of
accuracy
precision
the disorder of a system
the attraction of a nucleus for an electron
- 3. Multiple Choice
Which of these processes represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
- 4. Multiple Choice
Which of these reactions shows a DECREASE in entropy?
CaCO3(s) → CaO(s) + CO2(g)
3O2(g) → 2O3(g)
2NH3(g) → 3H2(g) + N2(g)
C6H6(l) → C6H6(g)
- 5. 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
- 6. Multiple Choice
Which reaction has a +ΔS ?
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)
- 7. 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
- 8. 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)
- 9. Multiple Choice
Entropy increases from solid, liquid to gas. Why?
Molecular disorder increases
Molecules increase in number from solid to gas
Molecules are heavier in solid
Molecules are more reactive
- 10. Multiple Choice
Which sample has the lowest entropy?
1 mole of HNO3(aq)
1 mole of KNO3(s)
1 mole of H2O(l)
1 mole of N2O(g)
- 11. Multiple Choice
Which state of matter has the greatest motion and least orderly arrangement?
solid
liquid
gas
aqueous
- 12. Multiple Choice
Which phase change represents a decrease in entropy?
solid to liquid
gas to liquid
liquid to gas
solid to gas
- 13. Multiple ChoiceEntropy always increases whenenthalpy decreases.temperature decreases.temperature increases.volume increases.
- 14. Multiple Choice
Given the change of phase: CO2(g) CO2(s)
As CO2(g) changes to CO2(s), the entropy of the systemdecreases
increases
remains the same
- 15. Multiple Choice
What phase of matter has the most entropy?
solid
liquid
gas
- 16. Multiple Choice
Entropy of a system increases when a reaction increases the number of particles.
True
False
- 17. Multiple Choice
Which represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
- 18. Multiple Choice
Predict the entropy change for this reaction
→ΔS = +ve and non spontaneous
ΔS = -ve and spontaneous
ΔS = -ve and non spontaneous
ΔS = +ve and spontaneous
- 19. Multiple Choice
Which of the reactions below has a negative ∆S?
CuCO3 (s) + 2HCl (aq) → CuCl2 (aq) + CO2 (g) + H2O (l)
C (s) + O2 (g) → CO2 (g)
CuO (s) + H2SO4 (aq) → CuSO4 (aq) + H2O (l)
BaCl2 (aq) + Na2SO4 (aq) → BaSO4 (s) + 2NaCl (aq)
- 20. 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
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