Thermal Energy Unit 2 Test

Front

What is thermal energy?

Back

Thermal energy is the total kinetic energy of the particles in a substance, which is related to its temperature.

Front

How does temperature relate to thermal energy?

Back

Temperature is a measure of the average kinetic energy of the particles in a substance; higher temperature means higher thermal energy.

Front

What happens to the motion of particles when heat is added to a substance?

Back

The particles move faster and spread apart, increasing the thermal energy of the substance.

Front

What is the process of heat transfer called when it occurs through direct contact?

Back

Conduction.

Front

What is convection?

Back

Convection is the transfer of thermal energy through the movement of fluids (liquids or gases) caused by differences in temperature.

Front

What is radiation in terms of thermal energy?

Back

Radiation is the transfer of thermal energy through electromagnetic waves, such as sunlight.

Front

What happens to water molecules when ice melts?

Back

The water molecules gain thermal energy, move faster, and occupy more space.

Front

What is the effect of adding heat to water?

Back

Adding heat to water increases the energy of motion of the water molecules, causing the temperature to rise.

Front

What is the main reason ice melts on a hot sidewalk?

Back

The energy from the sidewalk flows to the ice, causing it to melt.

Front

What is the difference between heat and temperature?

Back

Heat is the transfer of thermal energy, while temperature is a measure of the average kinetic energy of particles.