Question 1

Which state of H₂O has the greatest entropy?

Accepted Answer

vapor

Answer

water

Answer

ice

Question 2

Which statement is true about the ENTROPY?

Accepted Answer

Entropy refers to DISORDER, the unusable energy that escapes a system.

Answer

Entropy refers to the inability to destroy or create energy.

Answer

Entropy refers to the average kinetic energy of the molecules.

Answer

Entropy refers to the balance of temperature among two or more systems.

Question 3

As a system becomes more disordered, entropy

Accepted Answer

increases

Answer

decreases

Answer

cannot be determined

Answer

remains the same

Question 4

Which is an example of decreasing entropy in a closed system?

Accepted Answer

Freezing water

Answer

ice melting

Answer

Boiling water

Answer

Cells in a body coming together

Question 5

The entropy will usually increase when

Accepted Answer

all of these

Answer

a solid changes to a liquid

Answer

a reaction occurs that results in an increase in the number of moles of gas

Answer

a molecule is broken into two or more smaller molecules

Question 6

What information do we need to perform a calculation of Gibbs Free Energy?

Accepted Answer

all of the above are needed.

Answer

enthalpy of the reaction.

Answer

the temperature of the reaction in Kelvin.

Answer

entropy of the reaction.

Question 7

Which of the following would most likely lead to a spontaneous reaction.

Accepted Answer

A high negative enthalpy.

Answer

A high positive enthalpy.

Answer

A low negative enthalpy.

Answer

A low positive enthalpy.

Question 8

Which combination of ΔH and ΔS NEVER has a spontaneous reaction?

Accepted Answer

+ΔH and -ΔS

Answer

-ΔH and -ΔS

Answer

-ΔH and +ΔS

Answer

+ΔH and +ΔS

Question 9

Your enthalpy is high and negative but your entropy is also negative. What type of temperature would you want to get a spontaneous reaction?

Accepted Answer

low

Answer

high

Question 10

Determine the standard entropy change ∆S in this chemical reaction. Use the standard value of S $\degree$ .

CH₄_(g) + 2O₂(g) → CO₂_(g) + 2H₂O_(l)

Accepted Answer

-242.4 JK^-1

Answer

+242.4 JK^-1

Answer

+107.34 JK^-1

Answer

-107.34 JK^-1

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