Lesson 2 - Matter

What occurs when a liquid turns to a gas?

• molecules hit their freezing point

• evaporation

• condensation

• molecules move slower

During which state of matter are molecules moving the fastest?

• gas

• liquid

• solid

• none of the above

When does a physical change occur?

• when molecules combine to form a compound

• when elements combine to form a molecule

• when the size, shape, or state of matter changes

• when a new element is created

Which type of change can be reversed?

• physical change

• chemical change

• electrical change

• molecular change

If a substance changes color or a gas forms, which change has take place?

• chemical change

• physical change

• electrical change

• pressurized change

Which unit is used to measure mass?

• grams

• Celsius

• centimeters

• Newtons

In which state are molecules moving the slowest?

• solid

• liquid

• gas

• all of the above

What causes a solid to change to a liquid?

• freezing point

• evaporation

• cold

• heat

Which point has water reached when it turns from a liquid to a solid?

• freezing point

• melting point

• boiling point

• heating point

What is matter?

• measure of how heavy or light an object is

• amount of space an object takes up

• force of gravity on an object's mass

• anything that has both mass and volume