Entropy and Phase Changes

The video tutorial discusses a question from the ACS exam book about which process has the greatest entropy change. Entropy, denoted as Delta S, is explained as a measure of randomness or disorder. The tutorial uses a phase diagram to illustrate the states of matter: solid, liquid, and gas. It explains how entropy increases as matter transitions from solid to liquid to gas. The tutorial compares different phase transitions, highlighting that the transition from solid to gas involves the greatest entropy change due to the number of phases involved.

What is entropy commonly associated with?

• Pressure

• Energy

• Temperature

• Randomness

Which phase change involves an increase in entropy?

• Gas to solid

• Solid to liquid

• Liquid to solid

• Gas to liquid

What is the effect on entropy when temperature increases in a solid?

• Entropy decreases

• Entropy remains the same

• Entropy becomes zero

• Entropy increases

What happens to entropy when a solid turns into a gas?

• Entropy remains constant

• Entropy becomes zero

• Entropy increases

• Entropy decreases

Which of the following is not a phase change?

• Gas to solid

• Liquid to gas

• Solid to liquid

• Solid to energy

Which phase transition results in a decrease in entropy?

• Liquid to gas

• Liquid to solid

• Solid to liquid

• Solid to gas

How many phases are involved in the transition from solid to gas?

• Five

• Four

• Three

• Two

Which phase transition has the greatest change in entropy?

• Solid to gas

• Liquid to gas

• Solid to liquid

• Gas to liquid

What is the term for the heat required to change a solid to a liquid?

• Heat of fusion

• Heat of sublimation

• Heat of condensation

• Heat of vaporization

In which state are molecules most randomly arranged?

• Plasma

• Gas

• Liquid

• Solid