Gibb's Free Energy

What are the best conditions for a spontaneous reaction?

• High positive enthalpy, low temperature, low positive entropy.

• High negative enthalpy, high temperature, high positive entropy.

• Low negative enthalpy, low temperature, high positive entropy.

• High positive enthalpy, high temperature, low positive entropy.

What are the conditions for a spontaneous reaction with positive ΔH and positive ΔS?

• The temperature must be very low.

• The temperature must be very high.

• The reaction must occur at standard conditions.

• The reaction must be catalyzed.

What does a negative ΔG indicate about a reaction?

• The reaction is non-spontaneous under the given conditions.

• The reaction is at equilibrium.

• A negative ΔG indicates that the reaction is spontaneous under the given conditions.

• The reaction requires an input of energy to proceed.

What is the formula for calculating Gibbs Free Energy?

• ΔG = ΔH + TΔS

• ΔG = ΔH - TΔS

• ΔG = TΔH - ΔS

• ΔG = ΔH + ΔS

What is enthalpy (ΔH)?

• A measure of the total heat content of a system, reflecting the energy required to create a system and the energy required to displace its environment.

• A measure of the temperature of a system at constant pressure.

• The energy associated with the motion of particles in a substance.

• The total energy of a system excluding the energy required to create it.

What does a positive ΔG indicate about a reaction?

• A positive ΔG indicates that the reaction is spontaneous under the given conditions.

• A positive ΔG indicates that the reaction is non-spontaneous under the given conditions.

• A positive ΔG indicates that the reaction will occur rapidly.

• A positive ΔG indicates that the reaction is at equilibrium.

Why is Gibbs Free Energy important in chemistry?

• It helps predict whether a chemical reaction will occur spontaneously, guiding chemists in reaction design and understanding thermodynamic processes.

• It measures the temperature of a chemical reaction.

• It indicates the color change during a reaction.

• It determines the pressure of gases involved in a reaction.

What is the relationship between ΔG, ΔH, and ΔS?

• ΔG = ΔH + TΔS

• ΔG = ΔH - TΔS

• ΔG = TΔH - ΔS

• ΔG = ΔS - ΔH

What is the unit of Gibbs Free Energy?

• calories per mole (cal/mol)

• joules per mole (J/mol)

• kilojoules per mole (kJ/mol)

• watts per mole (W/mol)

What role does entropy play in determining spontaneity?

• Higher entropy (ΔS) increases the likelihood of spontaneity, especially at higher temperatures.

• Entropy has no effect on spontaneity.

• Lower entropy (ΔS) increases the likelihood of spontaneity.

• Entropy only affects the rate of reaction, not spontaneity.