Thermodynamics Exam Practice

A reaction that is endothermic:

• Energy is absorbed by the system from the surroundings

  +ΔH

• Energy is released from the system to the surroundings

  -ΔH

Tags

NGSS.HS-PS1-4

A reaction that is exothermic:

• Energy is absorbed by the system from the surroundings

  +ΔH

• Energy is released from the system to the surroundings

  -ΔH

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

A reaction that is spontaneous:

• Is not favorable and does not happen:

  +ΔG

• Is favorable and happens:

  -ΔG

Tags

NGSS.HS-PS1-4

A reaction that is nonspontaneous:

• Is not favorable and does not happen:

  +ΔG

• Is favorable and happens:

  -ΔG

An increase in entropy (disorder)

• An increase in microstates:

  +ΔS

• A decrease in microstates:

  -ΔS

Solid (s) --> Liquid (l) --> Gas (g)

• An increase in microstates:

  +ΔS

• A decrease in microstates:

  -ΔS

Tags

NGSS.HS-PS3-4

Gas (g)--> Liquid (l) --> Solid (s)

• An increase in microstates:

  +ΔS

• A decrease in microstates:

  -ΔS

Select all path functions:

• Enthalpy ΔH

• Entropy ΔS

• Heat (q)

• Gibbs Free Energy (ΔG)

• Work (w)

Select all state functions:

• Enthalpy ΔH

• Entropy ΔS

• Heat (q)

• Gibbs Free Energy (ΔG)

• Pressure (ΔP)

Tells us whether a reaction will happen or not:

• Enthalpy (ΔH)

• Entropy (ΔS)

• Gibbs Free Energy (ΔG)

• Heat (q)