Phases of Matter and Phase Changes

In a liquid...

• Particles are packed tightly together.

• Particles have a definite shape and volume.

• Particles have a no definite shape, but have a definite volume.

• Particles fly in all different directions.

The Law of Conservation of Mass states that...

• For every action, there is an opposite and equal reaction.

• An object in motion will remain in motion unless acted on by an outside force.

• The volume of an object is always equal to the mass of an object.

• Matter cannot be created nor destroyed, it can only change forms.

Phase changes are physical changes because...

• They are irreversible.

• They involved the rearrangement of elements to make something new.

• They create a new gas.

• They are reversible.

In the process of melting, a substance goes from...

• A solid to a liquid.

• A liquid to a solid.

• A gas to a liquid.

• A liquid to a gas.

A phase change from a liquid to a solid is called...

• Melting

• Boiling

• Condensing

• Freezing

In the table above, which compound would melt FIRST?

• Iodine

• Methane

• Sodium carbonate

• Water

We measure the boiling point of a substance by using...

• Mass

• Volume

• Density

• Temperature

What is the dew point of water?

• 0 ℃

• 100 ℃

• 0 ℉

• 100 K

Frozen carbon dioxide (also known as dry ice) changes phase directly from a solid to a gas. This is known as...

• Evaporation

• Condensation

• Vaporization

• Sublimation

During the baking soda and vinegar reaction, we measured the temperature of the vinegar. It was 20℃. After the two chemicals were mixed, the temperature was 15℃. What kind of reaction was this?

• An endothermic reaction.

• An exothermic reaction.

• A sublimation reaction.

• A condensation reaction.