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WorksheetsLG08 - Thermodynamics
Total questions: 38
Worksheet time: 36mins
Which type of reaction results in an increase in temperature?
exothermic
endothermic
isothermic
antithermic
Which type of reaction results in a decrease in temperature?
exothermic
endothermic
isothermic
antithermic
Which type of reaction consumes energy as a reactant?
exothermic
endothermic
isothermic
antithermic
Which type of reaction produces energy as a product?
exothermic
endothermic
isothermic
antithermic
Which type of reaction does the energy diagram above represent?
exothermic
endothermic
isothermic
antithermic
Which type of reaction does the energy diagram above represent?
exothermic
endothermic
isothermic
antithermic
Which one of the following is an exothermic process?
ice melting
water evaporating
boiling soup
condensation of water vapor
If the temperature of a reaction increases from 30°C to 35°C, what type of reaction occurred?
An endothermic reaction
An exothermic reaction
An isothermic reaction
An antithermic reaction
Entropy describes the amount of __________ in a system.
disorder
order
organization
tidiness
When the amount of disorder increases, the entropy _______________.
increases
decreases
Which phase of matter has the highest entropy?
solid
liquid
gas
Which phase change causes an increase in entropy?
deposition (g) → (s)
freezing (l) → (s)
boiling (l) → (g)
condensing (g) → (l)
What would be the effect on the particles if more heat is supplied to the system?
They would slow down
They would stop moving
They would speed up
There would be no effect
Heat always travels from ______ to ______ objects.
hot; cold
cold; hot
cold; cold
hot; hot
Which of the following reactions has the largest increase in entropy?
2 H2(g) + O2(g) → 2 H2O(g)
N2(g) + 3 H2(g) → 2 NH3(l)
2 SO2(g) + O2(g) → 2 SO3(g)
CH4(g) → C(s) + 2 H2(g)
Which of the following reactions has the largest increase in entropy?
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(g)
CH4(l) + 2 O2(g) → CO2(g) + 2 H2O(l)
CH4(g) + 2 O2(g) → CO2(g) + 2 H2O(l)
CH4(l) + 2 O2(g) → CO2(g) + 2 H2O(g)
Which of the following describe an exothermic reaction?
Releases energy
Increases the temperature
Energy is a reactant
Energy is a product
Absorbs energy
Which of the following describe an endothermic reaction?
Releases energy
Decreases the temperature
Energy is a reactant
Energy is a product
Absorbs energy
Which of the following show an increase in entropy?
Which of the following has the highest entropy? (Assume the size of the container is the same for each picture.)
Based on the data above, which reactions were exothermic?
A
B
C
D
Based on the data above, which reactions were endothermic?
A
B
C
D
Which of the following cause an increase in entropy?
Dumping out a bag of Flamin' Hot Cheetos
Sweeping up broken glass
A puddle of water evaporating on a hot summer day
A reaction with 4 reactants and 2 products
Burning a log of wood
The temperature of a reaction is measured over time and the data presented above. Which of the following describes the reaction with proper justification?
An exothermic reaction was performed because the temperature increased.
An exothermic reaction was performed because the temperature decreased.
An endothermic reaction was performed because the temperature decreased.
An endothermic reaction was performed because the temperature increased.
Entropy always increases when...
enthalpy decreases.
temperature decreases.
temperature increases.
volume increases.
An increase in the number of molecules from reactants to products
(e.g., 3 A → 4 B)
would cause a decrease in entropy.
true
false
For the following reaction indicate if entropy is increased or decreased:
2 Li(s) + 2 H2O(l) → 2 LiOH(s) + H2(g) + Energy
increase entropy
decrease entropy
For the following reaction indicate if entropy is increased or decreased:
KClO3(s) → KCl(s) + O2(g)
increase entropy
decrease entropy
The data above shows the number of reactant and product molecules during a chemical reaction. The reaction ends after 50 seconds. Based on the data above, which answer below correctly describes the change in entropy for this reaction?
The reaction increased entropy because it created more product molecules than reactant molecules.
The reaction increased entropy because it created fewer product molecules than reactant molecules.
The reaction decreased entropy because it created more product molecules than reactant molecules.
The reaction decreased entropy because it created fewer product molecules than reactant molecules.
Which conditions are required for a reaction to be thermodynamically favorable?
exothermic and increasing entropy
exothermic and decreasing entropy
endothermic and increasing entropy
endothermic and decreasing entropy
Which conditions are required for a reaction to be thermodynamically unfavorable?
exothermic and increasing entropy
exothermic and decreasing entropy
endothermic and increasing entropy
endothermic and decreasing entropy
Which conditions are required for a reaction to be temperature dependent?
exothermic and increasing entropy
exothermic and decreasing entropy
endothermic and increasing entropy
endothermic and decreasing entropy
Assuming the reactions below are all exothermic, which reactions are thermodynamically favorable?
Assuming the reactions below are all endothermic, which reactions are thermodynamically unfavorable?
2 H2(g) + O2(g) → 2 H2O(g)
N2(g) + 3 H2(g) → 2 NH3(l)
2 SO2(g) + O2(g) → 2 SO3(g)
CH4(g) → C(s) + 2 H2(g)
All phase changes (like melting, boiling, freezing, etc.) are...
thermodynamically unfavorable
thermodynamically favorable
temperature dependent
chemical changes
What is the thermodynamic favorability of the reaction below?
2 Li + 2 H2O → 2 LiOH + H2 + Energy
thermodynamically favorable
thermodynamically unfavorable
temperature dependent
favorablility cannot be determined
What is the thermodynamic favorability of the reaction below?
Energy + KCl(s) + O2(g) → KClO3(s)
thermodynamically favorable
thermodynamically unfavorable
temperature dependent
favorability cannot be determined
