Thermodynamics

When applying the first law of thermodynamics to a system, when is heat a positive quantity?

• when the system does work

• when the system has work done on it

• when the system absorbs heat

• when the system loses heat

For an isovolumetric process, which of the following statements is correct?

• a. Work, heat, and internal energy all undergo changes.

• b. Work and heat balance each other, so that there is no change in internal energy.

• c. No energy is transferred as heat; internal energy change is due to work.

• d. No work is done; internal energy change is due to heat.

For an isothermal process, which of the following statements is correct?

• a. Work, heat, and internal energy all undergo changes.

• d. No work is done; internal energy change is due to heat.

• c. Work and heat balance each other, so that there is no change in internal energy.

• d. No energy is transferred as heat; internal energy change is due to work.

For an adiabatic process, which of the following statements is correct?

• a. Work, heat, and internal energy all undergo changes.

• b. Work and heat balance each other, so that there is no change in internal energy.

• c. No energy is transferred as heat; internal energy change is due to work.

• d. No work is done; internal energy change is due to heat.

Do molecules generally move faster at 45 C or 106 C?

• 45 C because molecules have more energy than in 106C

• 106 C because molecules have more energy than in 45C

• 106 C because molecules have less energy than in 45C

• 45C because molecules have less energy than in 106 C

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

Which state of H₂O  has the greatest entropy?

• Ice

• Water

• Vapor

Tags

NGSS.MS-PS1-4

As a system becomes more disordered, entropy

• remains the same

• increases

• decreases

• cannot be determined

Which is an example of decreasing entropy in a closed system?

• Boiling water

• Freezing water

• Cells in a body coming together

• Ice melting

Heating a closed, steel container is an example of an

• Adiabatic process

• Isovolumetric process

• Isothermal process

• Isobaric process

Tags

NGSS.HS-PS3-4

In which of the following systems is entropy increasing?

• Putting together a puzzle

• Putting books on a shelf

• Breaking a plate

• Filling a jar of salt