Applications of the first law

The video tutorial explores various thermodynamic processes involving gases, such as pressure-volume work, free expansion, and the first law of thermodynamics. It delves into concepts like enthalpy, extensive and intensive properties, and heat capacity, providing a comprehensive understanding of these topics. The tutorial also explains the relationship between Cp and Cv for ideal gases, highlighting key principles and equations.

What happens to the piston in a cylinder when external pressure is greater than internal pressure?

• The piston moves inward.

• The piston remains stationary.

• The piston moves outward.

• The piston oscillates.

In a reversible process, how is the system brought back to its initial state?

• By applying a large external force.

• By rapidly changing the temperature.

• By making infinitesimal changes.

• By increasing the volume suddenly.

What is the work done during free expansion of a gas?

• Work depends on the temperature.

• No work is done.

• Negative work is done.

• Positive work is done.

How is enthalpy change related to heat absorbed at constant pressure?

• It is equal to the change in volume.

• It is equal to the change in temperature.

• It is equal to the heat absorbed.

• It is equal to the work done.

What is the enthalpy change for an exothermic reaction?

• Positive

• Depends on the pressure

• Negative

• Zero

Which of the following is an intensive property?

• Volume

• Enthalpy

• Mass

• Temperature

What happens to the boiling point of water when its quantity is halved?

• It increases.

• It decreases.

• It becomes zero.

• It remains the same.

What is the specific heat capacity of a substance?

• Heat capacity of 1 mole of substance.

• Heat capacity of a unit mass of the substance.

• Heat capacity of the entire system.

• Heat capacity of a unit volume of the substance.

How is the heat capacity at constant pressure denoted?

• Cr

• Cq

• Cp

• Cv

What is the relationship between Cp and Cv for an ideal gas?

• Cp = Cv - R

• Cp = Cv + R

• Cp = Cv / R

• Cp = Cv * R