Thermo Review

Which best describes thermal equilibrium?

• When the particles of two objects have the same average kinetic energy. 
• The process of transferring energy from high to low.
• The storage of energy inside an object.
• Balancing the weight of two objects.

A student mixed a cup of water at 20 °C with a cup of water at 80 °C. He briefly stirred the mixture for 10 seconds and measured the temperature. Thermal equilibrium will be reached at

• 25
• 40
• 50
• 60

Tags

NGSS.HS-PS3-4

Ice cubes are added to a drink to cool it down. Describe the transfer of energy.

• The coolness from the ice cube is transferred to the drink.
• The ice transfers heat into the drink as the ice melts thereby cooling the drink.
• The drink transfers energy to the ice causing the particles in the ice to move more rapidly – melting the ice
• The average kinetic energy of the ice decreases because of the drink.

Tags

NGSS.HS-PS3-4

Describe the transformation of energy required to move a car.

• Chemical  → Kinetic → Heat
• Heat → Kinetic → Chemical
• Kinetic → Heat → Chemical
• Chemical → Heat → Kinetic

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-3

The first law of thermodynamics states that the change in the internal energy of a system is equal to the difference in energy transferred to or from the system as heat and

• mass
• work done
• force
• pressure

Which best describes ENTROPY?

• Useful heat energy needed to drive an engine
• Heat that can be stored to be used at a later date
•   Random energy that escapes from the system
• A state of order in a physical system

Which state of H₂O  has the greatest entropy?

• Ice
• Water
• Vapor

Which method of heat transfer is happening here?

• Conduction
• Convection
• Radiation

Tags

NGSS.HS-PS3-4

Which method of heat transfer is happening here?

• Conduction
• Convection
• Radiation

Tags

NGSS.MS-PS3-3

NGSS.MS-PS3-4

Which method of heat transfer is happening when I hold a sheet of metal in a flame?

• Conduction

• Convection

• Radiation