Motion Lessons 7-9

What is sound energy?

• energy of molecules that move randomly through the air.

• energy of molecules that move back and forth through the air

• energy that is conducted through a closed circuit.

• energy that is created during a chemical reaction.

What is electrical energy?

• energy of molecules that move randomly through the air

• energy of molecules that move back and forth through the air

• energy that is conducted through a closed circuit

• energy that is created during a chemical reaction.

What is thermal energy?

• energy of molecules moving randomly through the air.

• energy of molecules moving back and forth through the air.

• energy that is created during a chemical reaction.

• energy that is conducted through a closed system.

What is chemical energy?

• energy of molecules moving randomly through the air.

• energy of molecules moving back and forth through the air.

• energy that is created during a chemical reaction.

• energy that is conducted through a closed circuit.

What are some signs of a chemical reaction?

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Answer explanation

heat, smoke, bubbles, color change, fire, explosion, sound

Based on class activities, what types of energy are created during a chemical reaction?

• gravitational energy and kinetic energy

• thermal energy and chemical energy

• sound energy and elastic energy

Why did the temperature increase when we mixed the aluminum foil and the copper chloride solution (blue liquid)?

• Because the aluminum foil and the copper chloride solution had a chemical reaction.

• Because we put the solution on a hot plate to heat it.

• Because the aluminum foil melted and made the copper chloride red.

When we pushed the rolling can, why does it eventually stop moving?

• The can loses all of its energy.

• The can transfers its energy to the air as sound energy and thermal energy.

• The rubber band inside the can can only have a small amount of elastic energy and when that runs out, the can stops.

What energy conversions occur when you pluck a guitar?

• The kinetic energy converts to electrical energy as it is conducted along the wire of the guitar strings.

• The elastic energy converts to thermal energy and gravitational energy.

• The elastic energy coverts to sound energy and kinetic energy in the air.

Where does the energy that makes you move come from?

• Your energy comes from the chemical reactions in your body when you eat food.

• Your energy comes from moving your arms and legs.

• Your energy comes from water and the sun.