Matter

In order for condensation to occur, the water vapor in the air must be ______________.

• cooled

• decreased

• heated

• blown by wind

Which of these objects has the properties of a solid?

• desk

• water

• rain

• milk

When a pan of water is boiling, the water level in the pan slowly disappears. What is happening?

• The heat from the pan causes the water to melt.

• The heat from the pan causes the water molecules to pack tightly together, taking up less space.

• Because the water is rapidly boiling, it spills out of the pan onto the stove.

• Heat causes liquid water to become water vapor, which is a gas.

An example of water in its solid state: _________.

• hail

• rain

• sweat

• dew

How are the molecules when matter is in a liquid state?

• They move around very fast.

• They move around a little bit.

• They are tight and compact together.

At which temperature will ice being to melt?

• 23 degrees F

• 28 degrees F

• 33 degrees F

• 38 degrees F

What is melting point?

• The temperature at which solids become liquid

• The temperature at which a liquid becomes a gas.

What does boiling point mean?

• The temperature at which gas turns to solid.

• The temperature at which liquid turns to a gas.