Water 8th Grade Science

Warm-Up Q). List as many words or phrases that come to your head when you think of the word hydrosphere

The hydrosphere is all of Earth’s water The hydrosphere is all of Earth’s water. (This includes water vapor in the air and in living things.) Hydrosphere – Water on Earth Lithosphere – Land on Earth Atmosphere – Air on Earth Biosphere – Plants/Animals (Life) on Earth

The _____________is all of Earth’s _________ The _____________is all of Earth’s _________. (This includes water _____________ in the air and in __________________ things.) Hydrosphere – Water on Earth Lithosphere – Land on Earth Atmosphere – Air on Earth Biosphere – Plants/Animals (Life) on Earth

6 Billion Kilometers Away Image of Earth 6 Billion Kilometers Away Voyager Space Probe 1990

Earth is known as the blue planet as it has a blue glow from space. This blue is from all of the water on our planet.

Water is critical for our planet. List some uses:

Water Usage. Copyright © 2010 Ryan P. Murphy

Survival / Health Copyright © 2010 Ryan P. Murphy

Household Copyright © 2010 Ryan P. Murphy

Recreational Copyright © 2010 Ryan P. Murphy

Industrial Copyright © 2010 Ryan P. Murphy

Transportation Copyright © 2010 Ryan P. Murphy

Agricultural Copyright © 2010 Ryan P. Murphy

Water use varies country to country.

Some places don’t have easy access to an ample supply of fresh water… Do you ever waste water? How might you value and use water differently if this was your daily reality?

What % of the earth is covered with water? Copyright © 2010 Ryan P. Murphy

Soil Moisture Rivers and Lakes In living things Remember, water is located in…. In the air (water vapor) Soil Moisture Rivers and Lakes Oceans Clouds are Water In living things Underground Ice Caps are Glaciers Copyright © 2010 Ryan P. Murphy

Ice Caps and __________ Remember, water is located in…. In the air (water vapor) _______ Moisture Rivers and Lakes Oceans _______ are Water In living things ______________ Ice Caps and __________ Copyright © 2010 Ryan P. Murphy

Close to 71% of the earth is covered with water! That’s over 2/3rds of our planet!!

Close to _______ of the earth is covered with water! That’s over ________ of our planet!!

Water’s importance Water is vital for every organism on the planet. Water mainly exists as a liquid on Earth. Water is the only substance found in all three states on Earth.

Water’s importance Water is vital for every _____________ on the planet. Water mainly exists as a __________on Earth. Water is the ______ substance found in all ________ _________ on Earth.

O 1 molecule of water is made up of 2 hydrogen atoms STRUCTURE OF WATER H H O 1 molecule of water is made up of 2 hydrogen atoms bonded with 1 oxygen atom

O 1 molecule of water is made up of __ __________ atoms STRUCTURE OF WATER H H O Chemical Formula:_______ 1 molecule of water is made up of __ __________ atoms bonded with __ ____________ atom.

CHEMICAL FORMULA H2O = RIGHT H2O = WRONG 2HO = WRONG

What is a molecule? A molecule is a group of atoms bonded together.

H H O STRUCTURE OF WATER The bond that forms water is a covalent bond because electrons are shared between both atoms.

The bond that forms water STRUCTURE OF WATER H H O The bond that forms water is a ___________ bond because electrons are ___________between both atoms.

O H 1 molecule of water

A LOT OF MOLECULES OF WATER H O H O H O H O H O H O H O H O H A LOT OF MOLECULES OF WATER O H O H O H O H O H O H O H O H O H

Millions of molecules of water make up 1 raindrop!

A water molecule is POLAR This means that it has electrically charged areas. There are opposite charges on opposite sides of the molecule One side is positive and one side is negative. Also called a polar substance or polar compound. _ + DURACELL

A water molecule is POLAR This means that it has electrically ____________ areas. There are ______________ charges on opposite sides of the molecule One side is positive and one side is _____________. Also called a ___________ substance or polar compound. (Just think of the north and south poles being at opposite ends of the planet.) _ + DURACELL

NON-POLAR SUBSTANCES Non-polar substances do not have charged ends because charges are equally distributed.

NON-POLAR SUBSTANCES Non-polar substances ___ _____have charged ends because charges are _______ distributed.

POLAR MOLECULE The positive hydrogen ends of 1 molecule are attracted to the negative oxygen end of another molecule. O H O H

POLAR MOLECULE The ____________ ____________ ends of 1 molecule are ______________ to the _____________ _____________ end of another molecule. O H O H +

+ + O H - -

+ + O H - O H

+ + O H O H O H

O H + + O H O H O H

O H O H + O H O H O H

Polarity drives other properties! Universal Solvent (http://www.bing.com/videos/search?q=salt+dissolving&&view=detail&mid=1C4F3B3485AE5864891F1C4F3B3485AE5864891F&FORM=VRDGAR) Cohesion Adhesion Surface tension Capillary Action And others.

Mini Labs You will be conducting a series of labs today in order to determine what properties are taking place and how these properties are at work.

States of Matter Water can take the form of a solid, liquid or gas on our planet. Water exists mainly as a liquid on Earth.

Group Activity Work with your group to develop an explanation for the following question. Write it down and draw a picture to help you explain. Be ready to share your ideas with the class.

If this is true, why does ice (a solid) float in water (a liquid). Almost all solid substances are more dense than when they are in liquid form. If this is true, why does ice (a solid) float in water (a liquid).

Watch the movie to find out! “The Chemistry of Ice” http://www.clearbiology.com/water-molecule-worksheet/ Watch the movie to find out! “The Chemistry of Ice”

Testing water’s polarity… See if you can use water’s polarity to “bend water” with a balloon.

HW “Amazing Properties of Matter” worksheet

Warm-Up: 4/7/16 Q). Water’s nickname is “Universal Solvent.” Why?

Polarity drives other properties! Universal Solvent (http://www.bing.com/videos/search?q=salt+dissolving&&view=detail&mid=1C4F3B3485AE5864891F1C4F3B3485AE5864891F&FORM=VRDGAR) Cohesion Adhesion Surface tension Capillary Action