Gibbs Free Energy and Spontaneity

The video tutorial explains Gibbs free energy, defined as the change in enthalpy minus the temperature times the change in entropy at constant pressure and temperature. It discusses the conditions under which a reaction is spontaneous, focusing on the sign of Delta G. The tutorial analyzes different cases based on the signs of Delta H and Delta S, explaining when reactions are spontaneous. An example involving calcium oxide and carbon monoxide is used to illustrate these concepts.

What is the relationship between Gibbs Free Energy, enthalpy, and entropy?

• Delta G = Delta H * T * Delta S

• Delta G = Delta H + T * Delta S

• Delta G = Delta H - T * Delta S

• Delta G = T * Delta S - Delta H

Under what condition is a process considered spontaneous?

• When Delta G is greater than zero

• When Delta G is equal to zero

• When Delta G is less than zero

• When Delta G is positive

What contributes to a negative Delta G in an exothermic reaction?

• Positive Delta H and negative Delta S

• Negative Delta H and positive Delta S

• Positive Delta H and positive Delta S

• Negative Delta H and negative Delta S

In which case is Delta G always negative regardless of temperature?

• Positive Delta H and negative Delta S

• Negative Delta H and negative Delta S

• Positive Delta H and positive Delta S

• Negative Delta H and positive Delta S

When is a reaction with negative Delta H and negative Delta S spontaneous?

• Never

• At all temperatures

• At low temperatures

• At high temperatures

What happens to Delta G in an endothermic reaction with a positive Delta S at high temperatures?

• Delta G becomes negative

• Delta G becomes zero

• Delta G remains unchanged

• Delta G becomes positive

In which scenario is Delta G always positive?

• Positive Delta H and negative Delta S

• Negative Delta H and positive Delta S

• Negative Delta H and negative Delta S

• Positive Delta H and positive Delta S

What is the entropy change when calcium oxide reacts with carbon monoxide to form calcium carbonate?

• Entropy change is unpredictable

• Entropy decreases

• Entropy remains constant

• Entropy increases

If a reaction is spontaneous and involves a decrease in entropy, what can be inferred about Delta H?

• Delta H is positive

• Delta H is zero

• Delta H is negative

• Delta H is unpredictable

For the reaction of calcium oxide with carbon monoxide, what condition must be met for spontaneity?

• Delta H must be negative

• Delta H must be zero

• Delta H is irrelevant

• Delta H must be positive