How do you use water?

Agenda for Wednesday Sept. 7th 1.Collect syllabus/safety sheets2.Set-up notebooks3.Water intro4.Water cycle5.Video

Lab Tomorrow – need signed safety sheets

How do we use water?

HOW MUCH WATER IS THERE TO DRINK?97% = OCEAN'S (SALTY) 3% Freshwater 2% = GLACIERS (ICE) 1% = DRINKABLE WATER

Freshwater31% available to drink 69% is in glaciers

Water• Where there is water there is life– where water is scarce, life has to struggle or just

"throw in the towel"

• "universal solvent“– It dissolves more substances than any other liquid– Wherever water goes, ground or bodies, it takes along

valuable chemicals, minerals, and nutrients

• See it in 3 states in nature: solid, liquid, gas

Water

• Covers approximately 71% of Earth's surface• Life evolved in water• Living things are 70-90% water• In nature, water is a solvent for many kinds of

chemical reactions• Forms hydrogen bonds with other polar or

charged particles• freezes at 32o Fahrenheit (F) and boils at 212o F

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• Hydrogen bonding gives water cohesive property• Water molecules are attracted to other polar

substances – adhere to many kinds of materials

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The Water Cycle• Describes the existence and movement of water

on, in, and above the Earth• Earth's water is always in movement – always changing states, from liquid to vapor to ice

and back again• The water cycle has been working for billions of

years• All life on Earth depends on it continuing to work

Water Cycle1. Infiltration – water seeping into the ground2. Evaporation – water becoming a gas and

floating up into the atmosphere3. Condensation – water changing from a gas to a

liquid)4. Precipitation – water falling down to Earth from

the atmosphere

List the four steps to the water cycleAgenda for Thursday Sept 8th 1.Review water cycle2.Finish video3.Water cycle reading4.Lab

Learning Objectives1. Describe the steps of the water cycle2. Describe how a drop of water travels through the water cycle

What water is best to drink?

Describe the journey of a drop of water through the water cycle.

Agenda for Friday Sept 9th 1.Lab2.Discuss lab

Learning Objectives1.Describe the steps of the water cycle2.Describe how a drop of water travels through

the water cycle

What happens when pollution gets into rivers and lakes?

Agenda for Monday Sept 12th 1.Water cycle review2.Water readings (pollution)3.Bottled water lab continued

Objectives1.Identify local sources of pollution2.Describe how local sources of pollution can be

harmful to us.

Where does your bottled water come from?

• municipal water supplies– reverse osmosis – removes large molecules/ions

– Deionization – mineral ions removed

– carbon filtration – removes pesticides, volatile organic chemicals

– Ozonation – eliminates inorganic, organic and microbiological problems, taste and odor problems