Science

_______ in the air comes from liquid water that has evaporated.

• Carbon Dioxide

• Nitrogen

• Oxygen

• Water Vapor

When a liquid turns into a gas, such as when liquid water turns into water vapor, we call that ______.

• evaporation

• condensation

• boiling

• freezing

How can water become a gas? Which demonstration should he do?

• Place water in a test tube, heat it until it is gone, and weigh it at the end.

• Crush several ice cubes into small pieces and measure their weight.

• Place ice in a beaker of water. Then point out how water soon collects on the outside.

• Pour water in an ice cube tray, put it in the freezer and observe its volume

A ____ is a group of atoms joined together in a particular way.

• substance

• molecule

• atom

• bond

The ____ is all of the liquid water and ice on Earth.

• hemisphere

• hydrosphere

• atmosphere

• biosphere

. ____ happens when a gas turns into a liquid.

• Freezing

• Melting

• Condensation

• Evaporation

Water molecules are spread apart in _______.

• liquid water

• water vapor

• frozen water

• ice

Drops of water can form when enough water vapor gets cold and ____ into liquid water.

• freezes

• boils

• evaporates

• condenses

A student wants to show how the hydrosphere and the atmosphere interact. Which model could the student make to show this interaction?

• a life-cycle diagram of a frog in a pond

• separate drawings of the ocean and of the sky

• a model of a volcano releasing gas into the air

• a model of a cloud forming in the sky

______ is water in the form of invisible gas.

• Water Vapor

• Nitrogen

• Carbon Dioxide

• Oxygen