A mixture of gases is heated and rises to the top of its container. Which statement best explains this result?
a
Heated gases will have decreased kinetic energy and increased density.
b
Heated gases will have decreased kinetic energy and decreased density.
c
Heated gases will have increased kinetic energy and decreased density.
d
Heated gases will have increased kinetic energy and increased density.
c
Heated gases will have increased kinetic energy and decreased density.
During an experiment, a canister filled with hot water was added to a beaker filled with cold water. In which direction did the heat energy move?
a
Equal amounts of heat energy from each container moved in both directions.
b
No heat energy moved, as it all remained in the canister of hot water.
c
The heat energy moved from the hot water of the canister into the cold water of the beaker.
d
The heat energy moved from the cold water of the beaker into the hot water of the canister.
c
The heat energy moved from the hot water of the canister into the cold water of the beaker.
An aluminum block with a temperature of 300oC is placed into 200 milliliters of water with a temperature of 20oC. Which statement best describes what will be observed in this experiment?
a
Heat will flow from the metal to the water until both are 300oC.
b
Heat will flow from the metal to the water until both are 20oC.
c
Heat will flow from the metal to the water until both are at the temperature of the container.
d
Heat will flow from the metal to the water until both are at a temperature somewhere between 20oC and 300oC.
d
Heat will flow from the metal to the water until both are at a temperature somewhere between 20oC and 300oC.
A student wants to show the transfer of heat energy without matter. Which investigation design would best help the student?
a
an investigation of conduction through collisions between particles in space
b
an investigation of radiation through a current in a fluid
c
an investigation of conduction through the movement of particles through a solid
d
an investigation of radiation through electromagnetic waves
d
an investigation of radiation through electromagnetic waves