PS Ch. 3.2 Changes of State

Poll

Do you think your body takes in energy, or gives off energy when you sweat?

• Takes in energy

• Gives off energy

Multiple Choice

What happens to the particles of a substance when it condenses?

• Particles speed up and spread out.

• Particles slow down and clump together.

• Particles stick together and stop moving.

• Particles vibrate as they lose energy

Multiple Choice

The temperature at which a substance changes from a liquid to a solid

is the

• freezing point

• saturation point

• boiling point

• condensation point

Fill in the Blank

Dry ice changes directly from a solid to a gas. What is that process called?

Multiple Choice

When ice melts to form liquid, energy is

• created

• destroyed

• released

• absorbed

Multiple Choice

A substance changes from a liquid to a gas during evaporation because

• energy is lost

• energy is released

• energy is created

• energy is absorbed

Multiple Choice

According to the law of conservation of mass,

• mass is lost only in chemical changes.

• mass is lost only in physical changes.

• total mass stays the same in changes of state.

• only energy is lost in changes of state

Multiple Choice

According to the law of conservation of energy,

• energy is not absorbed or released in changes of state.

• energy is not transferred during changes of state.

• energy is not created or destroyed in changes of state.

• a substance has the same energy before and after a change of state.

Multiple Choice

The engine of a car left running for a long period of time becomes hot

because

• energy is created by burning gasoline.

• energy is absorbed by burning gasoline.

• energy is transferred from burning gasoline.

• energy is released as gasoline evaporates.