Thermodynamics Pretest

In an isothermal process , the internal energy of gas molecules

• Increases

• Decreases

• Remains constant

Entropy change depends on:

• Heat transfer

• The number of the particles

• Change in temperature

Tags

NGSS.HS-PS3-4

According to first law of thermodynamics:

• Work done by a system is equal to heat transferred by the system.

• Entropy of a system remains constant.

• The internal energy and the entropy of the process remain constant.

• The total energy of a system remains constant.

According to the first law of thermodynamics

• Heat flows from hot object to cold object.

• Heat pump is the most efficient.

• Heat and work are mutually convertible.

Consider a refrigerator in a kitchen. And consider the refrigerator and everything in it is a system. Which best describes the system's surrounding?

• All of the air in the kitchen

• The air inside the refrigerator

• Everything in the universe external to the system.

A gas in a closed container is heated with 10J of energy, causing the lid of the container to rise 2m with 3N of force. What is the total change in energy of the system?

• 8J

• 6J

• 4J

• −4J

• 10J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

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?

• 45J

• 18J

• 12J

• 5J

Tags

NGSS.HS-PS3-1

A 78g vial of an unknown liquid is 98°C. Julie adds 3g of the same liquid at 40°C to the vial. What is the final temperature?

• 94.74∘C

• 77.64∘C

• 95.85∘C

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

A bathtub and a coffee cup both contain water at 90°C. Which of the following is true?

• The cup contains more heat, and the two have the same temperature

• The two contain the same amount of heat, and the bathtub has a higher temperature

• The bathtub contains more heat, and the two have the same temperature

• The two contain the same amount of heat and have the same temperature

Tags

NGSS.MS-PS1-4

In order for heat transfer to occur, which of the following must be present?

• Temperature gradient

• contact between two mediums

• a medium

• All of these must be present for heat transfer to occur

Tags

NGSS.HS-PS3-4