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WorksheetsGC 2 - Spontaneous Process
Total questions: 33
Worksheet time: 27mins
Reactions which do not produce the written products under the given conditions
spontaneous
non-spontaneous
Spontaneous reactions may be extremely slow.
True
False
Solids have more entropy than liquids
True
False
What is a spontaneous process ?
process that does not need external intervention to occur
fast process
process that needs an external intervention to occur
Given the change of phase:
CO2(g) —> CO2(s)
As CO2(g) changes to CO2(s), the entropy of the system
remains the same
decreases
increases
Which one is correct example of spontaneous process?
arranging a deck of cards
dropping an egg on the floor
A ball rolling downhill
spraying an air freshener
Lighting a match is a nonspontaneous reaction
True
False
Photosynthesis is a spontaneous reaction (photosynthesis is endothermic and orderly)
True
False
Rusting a iron is spontaneous reaction (rusting an iron is exothermic and orderly)
True
False
A combustion reaction is a spontaneous reaction
True
False
Distinguish the process as spontaneous or non-spontaneous process:
Melting of ice
Spontaneous
Non-spontaneous
Distinguish the process as spontaneous or non-spontaneous process:
Drying of leaves
Spontaneous
Non-spontaneous
Distinguish the process as spontaneous or non-spontaneous process:
Marble going down the hill
Spontaneous
Non-spontaneous
Distinguish the process as spontaneous or non-spontaneous process:
Freezing of water at room temperature
Spontaneous
Non-spontaneous
Distinguish the process as spontaneous or non-spontaneous process:
Ignition of books in the shelves
Spontaneous
Non-spontaneous
Distinguish the process as spontaneous or non-spontaneous process:
Cold air rises
Spontaneous
Non-spontaneous
What law of thermodynamics govern the heat flow statement?
Zeroth law
First law
Second law
Third law
Describe the flow of heat according to the law of thermodynamics
(a)
Which of these processes represents a decrease in entropy?
sublimation of CO2
boiling water
condensation of steam on cold glass
NaCl dissolving in water
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)
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)
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
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
What information do we need to perform a calculation of Gibbs Free Energy?
Enthalpy of the reaction.
Entropy of the reaction.
The temperature of the reaction in Kelvin.
All of the above are needed.
Which of the following would most likely lead to a spontaneous reaction.
A high negative enthalpy.
A low negative enthalpy.
A high positive enthalpy.
A low positive enthalpy.
Your enthalpy is +20 and your entropy is +5. Which temperature will give a spontaneous reaction?
0
4
8
Your enthalpy is high and negative but your entropy is also negative. What type of temperature would you want to get a spontaneous reaction?
low
high
Which combination of ΔH and ΔS NEVER has a spontaneous reaction?
+ΔH and +ΔS
+ΔH and -ΔS
-ΔH and -ΔS
-ΔH and +ΔS
Your enthalpy is -20 and your entropy is -8. Which temperature will give you a spontaneous reaction?
1
3
5
At what temperature would a given reaction become spontaneous if ΔH =+119kJ and ΔS=+263J/K.mol
452 K
-2210 K
382 K
-363 K
6. The formation ½ A2 + 2 B2 + C --> CAB4 has an enthalpy of formation of -104 kJ and a change in entropy of -60.8 J/K at 30 °C. What is the free energy and spontaneity of the reaction?
-85.6 kJ, spontaneous
-18.3 kJ, not spontaneous
+18.3 kJ, spontaneous
+85.6 kJ, not spontaneous
