States of Water

States of Water

Water is one of the few things that is found in nature as a solid, liquid and a gas

There are three states of matter

Solid, liquid, gas

Solid Water - Ice

• When water freezes, it expands or gets bigger.

• Molecules vibrate back and forth but do not move to different positions.

• Ice floats in water because 

       it is less dense.

Liquid - Water

• molecules move freely so sometimes they

  bump into each other.

• most things dissolve in water which makes water the universal solvent.

• greatest range of temperatures

  very cold water to very hot water.

Gas - Water Vapor

• molecules move quickly and far apart.

• water in a gas state is called water vapor.

Multiple Choice

When water freezes, does it expands (gets bigger) or contract (get smaller)?

• expands

• contracts

Multiple Choice

Ice is ____ than liquid water.

• more dense

• less dense

Multiple Choice

This state has the greatest range in temperatures.

• solid

• liquid

• gas

Multiple Choice

True or False: molecules in the liquid state vibrate back and forth but don't move positions.

• True

• False

Multiple Choice

Water vapor (gas) - molecules move quickly and are far apart.

• True

• False

The Water Cycle

The Sun provides the heat which can make water change from one state to another.

Evaporation

• Evaporation - heat from the Sun makes the liquid water molecules move faster and evaporate or change into a gas.

• Liquid to a gas.

• Temperature increases.

Condensation

• Condensation - water vapor molecules floating in the air cool down and change back into a liquid (clouds).

• Gas to a liquid.

• Temperature decreases.

Precipitation

• Precipitation - the water drops in the cloud get bigger and bigger (cohesion) until eventually they fall as rain or snow.

Multiple Choice

Condensation is ____

• gas to a liquid

• liquid to a gas

• gas to a solid

Multiple Choice

Evaporation is

• gas to a liquid

• liquid to a gas

• solid to a gas