Condensation and Evaporation

How can we describe the molecules of a liquid?

• The molecules are very far apart, not tightly packed, constantly moving in random directions, and able to slide past each other.

• The molecules are close together but not tightly packed, constantly moving in random directions, and able to slide past each other.

• The molecules are close together and tightly packed, so they are not able to move or slide past each other.

• The molecules are very far apart, but they have very little movement at all.

What happens when molecules near the surface of water "pop" out?

• They disappear

• They become solids

• They form a gas, called vapor

• They fall right back into the water.

What is the process of water changing from a liquid to a gas? (This is also the reason you need to add water to your goldfish bowl often.)

• evaporation

• condensation

• vaporizing

• precipitation

Why would your goldfish water evaporate more quickly in the sun?

• The sun dries up the water.

• Being in the sun makes no difference.

• Fish enjoy the warmer temperatures.

• Heat causes the water molecules to move more quickly, which causes them to "pop" out more often.

The change from water vapor or gas back to a liquid is called ______________.

• evaporation

• precipitation

• condensation

• water cycle

What causes the moisture to form on the outside of a glass of ice water?

• evaporation

• condensation

• rain

• humidity

Which of the following are examples of evaporation? (There are 2 correct answers)

• Steam from a pot of boiling water

• Wetness on the outside of a cold drink

• A puddle of water that forms during a storm

• A puddle of water that dries up in the sun after a storm.