Entropy
Physics ⇒ Heat and Thermodynamics
Entropy starts at 11 and continues till grade 12.
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See sample questions for grade 11
A 1 mol ideal gas is compressed isothermally and reversibly at 300 K from 20 L to 10 L. Calculate the change in entropy.
A 2 mol ideal gas expands isothermally and reversibly at 300 K from 10 L to 20 L. Calculate the change in entropy.
A block of ice melts at 0°C by absorbing 334 J of heat. What is the change in entropy? (Assume melting is reversible and T = 273 K)
A gas expands isothermally and reversibly from volume V₁ to V₂ at temperature T. Write the expression for the change in entropy of the gas.
A system absorbs 600 J of heat at 300 K. Calculate the change in entropy.
A system undergoes a reversible process in which it absorbs 200 J of heat at 400 K and then releases 200 J of heat at 200 K. What is the total change in entropy of the universe?
Calculate the entropy change when 1000 J of heat is transferred reversibly to a reservoir at 400 K.
Describe how entropy is related to the number of microstates in a system.
Describe the relationship between entropy and the direction of spontaneous processes.
Describe what happens to the entropy of the surroundings when a system absorbs heat reversibly.
Explain the significance of Boltzmann's entropy formula S = k ln W.
Explain the significance of entropy in the context of the arrow of time.
Explain why entropy increases in an irreversible process.
Explain why entropy is considered an extensive property.
Explain why mixing two different gases at constant temperature and pressure increases the entropy of the system.
If 500 J of heat is reversibly transferred to a system at 250 K, what is the change in entropy?
If a process is reversible, what is the total entropy change of the universe?
State the SI unit of entropy.
A 3 mol sample of an ideal gas is heated reversibly at constant pressure from 400 K to 600 K. Calculate the change in entropy of the gas. (R = 8.314 J·mol−1·K−1)
A gas undergoes a free expansion (expansion into vacuum) from volume V1 to V2 at constant temperature. What is the change in entropy of the gas?
