Changes in Matter

Front

What is the measure of the average energy of random motion of particles?

Back

Temperature

Front

What is the total energy of all of the particles in an object?

Back

Thermal energy

Front

What type of change occurs when fireworks explode giving off light and heat?

Back

Chemical change

Front

What is Pablo observing when ice cream melts at room temperature?

Back

Physical change

Front

What is a physical change?

Back

Alters form but does not change its original properties.

Front

What is a chemical change?

Back

Alters the substance into a different substance.

Front

What happens to the particles in a substance during a physical change?

Back

They rearrange but do not change their chemical composition.

Front

What is an example of a physical change?

Back

Melting ice.

Front

What is an example of a chemical change?

Back

Rusting of iron.

Front

What is the difference between temperature and thermal energy?

Back

Temperature measures the average energy of particles; thermal energy is the total energy of all particles.