Entropy

Entropy is a measure of

• heat energy

• temperature

• the disorder/randomness of a system

A small S value indicates the system has _______

• more order

• more randomness

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases
• Molecular randomness decreases
• Molecules are more energetic
• Molecules are more reactive

Tags

NGSS.MS-PS1-4

Which phase of matter has the greatest motion and least orderly arrangement?

• solid
• liquid
• gas

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which process is accompanied by a decrease in entropy?

• boiling of water

• condensing of water vapor

• subliming of iodine

• melting of ice

Given the change of phase:

CO₂(g) —> CO₂(s)

As CO₂(g) changes to CO₂(s), the entropy of the system

• decreases

• increases

• remains the same

Tags

NGSS.MS-PS1-4

Identify whether the following result in an increase or decrease in entropy:

3 moles of gas (on reactant side) --> 6 moles of gas (product)

• increase

• decrease

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