Free Energy

Free energy (ΔG) allows us to determine:

• Whether or not a reaction is spontaneous
• Whether a reaction is endothermic or exothermic
• Whether a reaction is gaining disorder

If ΔG is positive, a reaction is _____________.

• Always spontaneous
• Always nonspontaneous
• We need more information to decide.

If ΔH is positive, a reaction is _____________.

• Always spontaneous
• Always nonspontaneous
• We need more information to decide.

If ΔS is negative, a reaction is _____________.

• Always spontaneous
• Always nonspontaneous
• We need more information to decide.

If ΔG is negative, a reaction is _____________.

• Always spontaneous
• Always nonspontaneous
• We need more information to decide.

A reaction with a positive ΔH and a negative ΔS is

• Always spontaneous
• Never spontaneous
• Spontaneous at high temperatures
• Spontaneous at low temperatures

A reaction with a positive ΔH and a positive ΔS is

• Always spontaneous
• Never spontaneous
• Spontaneous at high temperatures
• Spontaneous at low temperatures

A reaction with a negative ΔH and a positive ΔS is

• Always spontaneous
• Never spontaneous
• Spontaneous at high temperatures
• Spontaneous at low temperatures

A reaction with a negative ΔH and a negative ΔS is

• Always spontaneous
• Never spontaneous
• Spontaneous at high temperatures
• Spontaneous at low temperatures