Thermodynamics Review

A student is cooking bacon in a pan on a stove top. What is the main method of heat transfer between the pan and the bacon?

• Entropy

• Radiation

• Convection

• Conduction

What condition is necessary for heat to flow between two objects?

• They must be of the same mass

• They must be of the same density

• They must have different temperatures.

• They must have different conductivity

Tags

NGSS.HS-PS3-4

What is the heat energy generated/emitted by the metal when a 250 kg lump of iron cools from 650° C to 20° C? Specific heat of iron is 449 J/kgC.

• 1,459,250,000 J

• 70,717,500 J

• 112,250 J

• -70,717,500 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

The first law of thermodynamics, the internal energy of a system can either be increased by adding heat or doing work on the system, is a restatement of the ____.

• Principle of entropy

• Law of Conservation of energy

• Law of heat addition

• Law of potential energy

A student is investigating the best method for heating marshmallow using an open flame. The student quickly discovers placing the marshmallow over the flame is more effective than heating the marshmallow on the side of the flame.

According to this information, what type of heat transfer is present when the marshmallow is above the fire that is not present when the marshmallow is on the side of the fire?

• Conduction

• Convection​

• Entropy

• Radiation

Tags

NGSS.HS-PS3-4

NASA developed a reflective foil barrier to help shield spacecraft from heat transfer in space. These reflective barriers are not used in homes to prevent heat transfer by the same method. What method of heat transfer is being prevented by the reflective barrier?

• Entropy

• Conduction

• Convection

• Radiation

Tags

NGSS.HS-PS3-4

What is the heat gained or lost when 20 kg of water experiences a change in temperature from 10° C to 40° C ? (Specific heat of water is 4186 J/kgC)

• 8000 J

• - 8000 J

• 2,511,600 J

• - 2,511,600J

Tags

NGSS.HS-PS3-1

A​ tray filled with ice is removed from the freezer. After a short period of time, the ice begins to melt. As the ice melts, it ―

• decreases in specific heat capacity

• increases​ in entropy

• decreases​ in temperature

• increases in temperature

Tags

NGSS.HS-PS3-4

A student that just received their driver’s license decides to buy a new car. He remembers from physics class that heat engines have a thermal efficiency that can be calculated. He asks the car deal for a car that has a high thermal efficiency rating. The car dealer says he has a car that is 100% efficient.

Which law of thermodynamics best describes why the car cannot be 100% efficient?

• The​ zeroth law of thermodynamics

• The​ second law of thermodynamics

• The​ first law of thermodynamics

• The​ third law of thermodynamics

A student is preparing to take a bath when she realizes that the hot water tap in the bathroom is not working. The student goes to the kitchen and prepares 20L of 100o​​C water to mix with 80L of 20o​​C . What will be the final temperature of the bath water?

• 36 o​​C

• ​120 o​​C

• 15 o​​C

• 80 o​​C

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5