Thermodynamics Review

Cooking fajitas on a pan is an example of what type of heat transfer?

• Conduction

• Convection

• Radiation

• Entropy

Tags

NGSS.HS-PS3-4

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

• They must be of the same mass.

• They must have different temperatures.

• They must be of the same density.

• They must have different conductivities

Tags

NGSS.HS-PS3-4

What is the heat energy generated/emitted by the metal when a 10 kg lump of iron
cools from 660° C to 650° C? Specific heat of iron is 100 J/kgC 

 $Q=mc\Delta T$  

• 10,000 J

• -10,000J

• 1000J

• -1000J

Answer explanation

 $Q=mc\Delta T$  
 $\Delta T=\left(650-660\right)$  
Q=10*100*-10
Q=-10,000 J

Tags

NGSS.HS-PS3-1

The first law of thermodynamics, the internal energy of a system can either be increased by adding heat or doing work on the system, while energy is never lost, is a restatement of the

• Principle of entropy

• Law of heat addition

• Conservation of energy

• Law of potential energy

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

What type of heat transfer is used to heat your marshmallow over the hot air?

• Conduction

• Convection

• Radiation

A reflective blanket is used to insulate people who are cold. What type of heat transfer to the environment is it preventing?

• Conduction

• Convection

• Radiation

What is the heat gained or lost when 20 kg of water experiences a change in temperature from 10° C to 30° C ? (Specific heat of water is 4186 J/kgC)

• 1,674,400J

• -1,674,400J

• 3,348,800J

• -3,348,800J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-4

As the ice melts, it...

• decreases it's specific heat capacity to change its temperature

• decreases the temperature of water

• absorbs thermal energy, increasing molecular entropy

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

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

• The zeroth law of thermodynamics (Thermal Equilibrium)

• The first law of thermodynamics (Conservation of Energy)

• The second law of thermodynamics(Entropy)

• The third law of thermodynamics (No Entropy)

Which point on the graph has the LOWEST entropy level?

• A

• C

• D

• E

Tags

NGSS.HS-PS3-1