Gibbs Free Energy and Reactions

The video tutorial explores the concept of spontaneity in chemical reactions, focusing on the conversion of limestone to lime. It explains the role of Gibbs free energy, enthalpy, and entropy in determining reaction spontaneity. The tutorial derives the temperature above which the reaction becomes spontaneous, emphasizing the balance between enthalpy and entropy. Despite being endothermic, the reaction is entropically favorable, and raising the temperature above 1118 Kelvin makes it spontaneous.

What is the chemical formula for lime produced from limestone?

• CaCO3

• Ca(OH)2

• CaO

• CO2

Which of the following values is given for the enthalpy change in the reaction?

• 160.2 J/K

• 160.2 kJ/mol

• 179.1 J/K

• 179.1 kJ/mol

What is the condition for a reaction to be spontaneous in terms of Gibbs free energy?

• Delta G < 0

• Delta G = 0

• Delta G = Delta H

• Delta G > 0

Which equation represents the relationship between Gibbs free energy, enthalpy, and entropy?

• Delta G = T Delta S - Delta H

• Delta G = Delta H - T Delta S

• Delta G = Delta S - T Delta H

• Delta G = Delta H + T Delta S

What must be true for the reaction to be spontaneous in terms of Delta H and T Delta S?

• Delta H > T Delta S

• Delta H is independent of T Delta S

• Delta H < T Delta S

• Delta H = T Delta S

How do you convert the enthalpy value from kilojoules to joules?

• Subtract 1000

• Divide by 1000

• Multiply by 1000

• Add 1000

What is the calculated temperature above which the reaction becomes spontaneous?

• 298 K

• 1118 K

• 1602 K

• 1791 K

Why is the reaction considered entropically favorable?

• It absorbs heat

• It produces more substances, including a gas

• It consumes a gas

• It releases heat

What is the significance of the temperature 1118 Kelvin in this reaction?

• It is the temperature below which the reaction is spontaneous

• It is the temperature at which the reaction stops

• It is the temperature at which the reaction is at equilibrium

• It is the temperature above which the reaction is spontaneous

What type of reaction is the conversion of limestone to lime in terms of enthalpy?

• Exothermic

• Adiabatic

• Endothermic

• Isothermal