Gibbs Free Energy: Predicting Spontaneity in Chemical Reactions

Mr. Andersen explains Gibbs free energy, a key concept in chemistry that determines whether a reaction is spontaneous. He discusses the roles of enthalpy and entropy, and how temperature influences these reactions. The video also covers phase changes, such as melting and freezing, and their relation to spontaneity. The Gibbs free energy equation is explored, highlighting its importance in predicting reaction behavior.

What does a negative Gibbs Free Energy indicate about a reaction?

• The reaction is non-spontaneous.

• The reaction is spontaneous.

• The reaction is at equilibrium.

• The reaction requires energy input.

Which two factors primarily contribute to Gibbs Free Energy?

• Volume and entropy

• Temperature and pressure

• Enthalpy and entropy

• Pressure and volume

In a thermite reaction, why is the reaction considered spontaneous?

• Because it requires a catalyst to proceed.

• Because the reactants have more energy than the products.

• Because the products have more energy than the reactants.

• Because it absorbs energy from the surroundings.

Why can't enthalpy alone determine the spontaneity of a reaction?

• Because pressure changes affect the reaction.

• Because entropy also plays a crucial role.

• Because temperature is the only factor that matters.

• Because volume changes are more significant.

What happens to entropy when ice melts into water?

• Entropy increases.

• Entropy becomes zero.

• Entropy remains constant.

• Entropy decreases.

Under what condition does water spontaneously freeze?

• When the temperature is above zero degrees Celsius.

• When the temperature is exactly zero degrees Celsius.

• When the temperature is below zero degrees Celsius.

• When the temperature is above 100 degrees Celsius.

What does the Gibbs Free Energy equation help predict?

• The speed of a reaction.

• The spontaneity of a reaction.

• The color change in a reaction.

• The pressure change in a reaction.

How does a high temperature affect the importance of entropy in the Gibbs Free Energy equation?

• It reverses the effect of entropy.

• It has no effect on entropy.

• It makes entropy more important.

• It makes entropy less important.

What is the effect of a positive Delta H and a high temperature on Gibbs Free Energy?

• It always results in a non-spontaneous reaction.

• It can result in a spontaneous reaction if entropy increases.

• It always results in a spontaneous reaction.

• It has no effect on the reaction's spontaneity.

Why does a cold pack feel cold when activated?

• Because it releases heat to the surroundings.

• Because it absorbs heat from the surroundings.

• Because it has a negative Delta H.

• Because it decreases entropy.