2nd 9 WKS

Front

What happens to the particles in a medium when a longitudinal wave passes through it?

Back

They move parallel to the wave direction.

Front

What indicates that a chemical reaction has occurred?

Back

The temperature of the vinegar increased during the reaction.

Front

What is a common sign of a chemical reaction when mixing liquids?

Back

A precipitate forms.

Front

Why does a ball thrown in the air come back down?

Back

The mass of Earth creates a pull of gravity on the ball.

Front

What is a characteristic of longitudinal waves?

Back

They involve particle motion parallel to wave direction.

Front

Define a longitudinal wave.

Back

A wave in which the particles of the medium move parallel to the direction of the wave.

Front

What is a precipitate in a chemical reaction?

Back

A solid that forms and settles out of a liquid mixture.

Front

What is gravity?

Back

A force that attracts two bodies toward each other, such as the Earth and an object.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change does not alter the substance's chemical composition, while a chemical change does.

Front

What is an example of a physical change?

Back

Melting ice.