Chem 1 - Heat & Temperature

When fast moving particles in a substance at a higher temperature collide with slower moving particles in a substance at a lower temperature, some energy gets transferred. This transfer of thermal energy is known as

• heat

• temperature

• science

• entropy

Tags

NGSS.HS-PS3-4

If a cup of hot coffee is placed in a room with cooler air, which best describes what occurs?

• energy is transferred randomly in all directions until everything becomes equal

• the kinetic energy will transfer from the particles of the hot coffee to the particles in the cooler air, so the hot coffee will cool down

• the cold transfers from the particles in the cooler air to the particles of the hot coffee, so the hot coffee will cool down

• the particles of the hot coffee will escape into the room, so the coffee will lose mass and cool down

Tags

NGSS.HS-PS3-4

When we measure the average speed of molecules by how often they collide with and transfer energy to a thermometer, we are measuring...

• potential energy

• heat

• entropy

• temperature

If two objects with different temperatures are touching, thermal energy will flow from the warmer object to the cooler one UNTIL

• molecular motion stops

• they both have an equal temperature

• one runs out of energy

• they reach absolute zero

Tags

NGSS.HS-PS3-4

When a popsicle melts, the particles in the popsicle _____.

(Choose TWO correct answers)

• absorb energy from the surroundings

• release energy to their surroudindings

• collide more which makes them change positions and start to move around more

• collide less and become more compact and structured

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

The liquids in each beaker are at the same temperature.

How does the heat (total thermal energy) of the liquid in the larger beaker compare to the thermal energy of the liquid in the smaller beaker?

• The liquid in the larger beaker has LESS thermal energy than the liquid in the smaller beaker.

• The liquid in the larger beaker has MORE thermal energy than the liquid in the smaller beaker.

• The liquid in the larger beaker has the SAME amount of thermal energy as the liquid in the smaller beaker.

Tags

NGSS.HS-PS3-4

Which description best defines heat?

• total thermal energy of an object or substance, due to the number of particles (mass) and the speed of the particles

• the change in the temperature of a substance in degrees Celsius

• average kinetic energy of the particles that make up a substance

• the temperature of a substance (how hot or cold it is)

The lowest possible temperature a substance could have is also known as

• Absolute zero

• Critical zero

• Kelvin zero

• Celsius zero

Tags

NGSS.HS-PS3-4

A student measures the temperature of a cup of vinegar to be 21.0 ^oC. She then adds a scoop of vinegar and the new temperature is 17.4 ^oC. Which is the correct mathematical model to show the change in temperature?

(Choose TWO correct answers)

• 21.0 - 17.4 = 3.6

• 17.4 - 21.0 = -3.6

• final - initial = change

• initial - final = change