Water Systems

As we know, everything needs water.

Plants drink water

Humans drink water

We use water to put out fires

Water has….

No colour

No taste

No smell

Solvent vs Solute

Many substances can dissolve in water.

Like salt and sugar.

When things dissolve in water…..

Water is called the solvent

The other thing is called the solute

As we know everything is made up of elements from the periodic table.

Pure Substance

When water is just H2O, we call this a pure substance

But as well know, water is never just H2O

We use Brita filters to help

filter out other particles.

We know there is fluoride in water that helps make our teeth whiter.

Mixture

When there is other stuff mixed in with the water, we call this a mixture.

If water is a pure substance or a mixture is still has three different states.Solid

Liquid

Gas

(water vapour)

Page 268 of the textbook

Read and discuss

The Water Cycle

Copy down the following key terms from pages 270 and 271

Melting

Sublimation

Evaporation

Condensation

Deposition

Freezing

The Water CycleCopy down the diagram from page 270

https://www.youtube.com/watch?v=al-do-HGuIk

Liquid water flows (it's a fluid), so if it has a chance for gravity to pull it closer to the centre of the earth it will flow that way. This is called runoff. Often the runoff goes into lakes and streams.

Sometimes the water stays with the ground and seeps into the soil. This water is called ground water. Ground water fills in the gaps between rocks and dirt. This rock, soil and water mixture is called an aquifer. The top of an aquifer, the area that separates it from the rock and dirt is called the water table (where the ground is placed atop the aquifer, hence table)

At some point, the water from oceans, lakes, streams, aquifer's and ice from snow and ice will evaporate or sublimate into the atmosphere.

Water vapour in the air flies around with the wind. Sometimes the wind gets pushed up higher into the air where it cools down and turns into liquid or solid water. This liquid or solid water falls down due to gravity and we call this precipitation (snow or rain or sleet, anything falling from the sky)

The snow can turn into polar ice sheets, ice caps and glaciers.

Water undergoes a big cycle, converting between different states and occupying different areas of the earth. So eventually you may drink water that was once on top of the rocky mountains.

Questions

Page 269 - # 1, 2

Page 273 # 1 - 5