The Water Molecule

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Interesting Facts About Water

The most abundant compound in most living things is water.

70% of an adult's body is water Water dissolves more substances than any

other liquid

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Facts Continued

• Drinking too much water can cause water intoxication. It occurs when water dilutes the sodium level in the bloodstream & causes an imbalance of water in the brain. This condition is termed at hyponatremia.

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Facts Continued

• The earth is a closed system, similar to a terrarium, meaning that it rarely loses or gains extra matter. The same water that existed on the earth millions of years ago is still present today.

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Facts Continued

• Much more fresh water is stored under the ground in aquifers than on the surface.

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Facts Continued

The U.S. uses about 346,000 million gallons of fresh water every day.

By the time a person feels thirsty, his/her body has lost over 1% of its total water amount.

The weight a person loses directly after intense physical activity is weight from water... not fat!

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Molecular Structure

When hydrogen and oxygen combine to form water, water is the PRODUCT.

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Molecular StructureThe oxygen atom is on one end of the molecule & the

hydrogen atoms are on the other end.

The oxygen end of the molecule has a slight negative charge and the hydrogen end of the molecule has a

slight positive charge.

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Why is the H2O Molecule Polar?

A water molecule is polar because there is an

uneven distribution of electrons between the

oxygen & hydrogen atoms.

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Hydrogen Bonds

Because of their partial (+) & (-) charges, polar molecules such as water can attract to each other.

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Hydrogen bonds are not as strong as covalent or ionic bonds, but water's ability to form multiple hydrogen bonds is responsible for many of its

special properties.

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A single water molecule may be involved in as many as 4 hydrogen bonds at the same time.

Demonstrating Hydrogen Bonding

Activity

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Vocabulary Review

What is makes a water molecule POLAR?

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A polar molecule has an unequal distribution of electrons; the two ends of the molecule have opposite charges.

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