1.) Which of the following represents the first law of thermodynamics? Explain.
- After falling down the hill, a ball's kinetic energy
plus heat energy equals the initial potential energy
- If a refrigerator is unplugged, eventually everything
inside of it will return to room temperature
- Two systems in equilibrium with a third system
are in equilibrium with each other
- The specific heat of an object explains how
easily it changes temperatures
- While melting, an ice cube remains at the same temperature
ANS: After falling down
the hill, a ball's kinetic energy plus heat energy equals the initial potential
energy
2.) A gas in a closed container is heated, causing the lid of the container to rise. The gas performs 3J of work to raise the lid, such that is has a final total energy of 15J. How much heat energy was added to the system?
ANS. 18J
3.) A gas in a closed container is heated with 50J of energy, causing the lid of the container to rise. If the change in energy of the system is 30J, how much work was done by the system?
3.) A gas in a closed container is heated with 50J of energy, causing the lid of the container to rise. If the change in energy of the system is 30J, how much work was done by the system?
ANS. 20J
4.) An object can never reach absolute zero in a finite number of steps. Which of these laws supports this statement? Explain.
- Third law of thermodynamics
- First law of thermodynamics
- Newton's first law
- Second law of thermodynamics
ANS. Third law of thermodynamics
5.) Which has a higher positional entropy value? O2 at 10 atm or O2 at 1 atm?
ANS. #2: O2 at 1 atm
6.) Which of the following processes is associated with an increase in the entropy of the system?
- Condensation
- Deposition
- Freezing
- Sublimation
7.) Which of the following statements are true?
- The change in the entropy of the universe is equal to zero for a spontaneous process
- The change in the entropy of the system is always positive
- The change in the entropy of the surroundings is negative
- The change in the entropy of the universe is negative for a non-spontaneous
process
ANS. The change in the entropy of the universe is negative for a non-spontaneous process
8.) Who came up with the name Zeroth Law?
ANS: Robert Fowler
9.) Third law allows us to understand that as the entropy of a system approaches a temperature of absolute zero, the entropy present within a system ________.
ANS: decreases
10.) It says that if two systems are in thermal equilibrium with a third system, then the first two systems are also in thermal equilibrium with one another. What law is this?
ANS: Zeroth Law
REFERENCES:
- https://www.varsitytutors.com/high_school_physics-help/understanding-the-first-law-of-thermodynamics
- https://www.varsitytutors.com/high_school_physics-help/understanding-the-first-law-of-thermodynamics
- https://www.khanacademy.org/science/biology/energy-and-enzymes/the-laws-of- thermodynamics/v/first-law-of-thermodynamics-introduction?utm_account=Grant&utm_campaignname=Grant_Science_Dynamic&gclid=Cj0KCQiA5dPuBRCrARIsAJL7oeiRAEzb02v7D9xvxaavGougu2a7XcNeAdN_nCos9H-o6V91NF5mBNEaAuEAEALw_wcB
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