Water and Properties

Water and its

Properties

Content: Describe the properties of water and how they play a role in its functionality on our earth. Language: -Share in cooperative groups about water properties -Read and write about the different water properties and their role in life.

Objectives:

Lets see what you may know

1 Oxygen & 2 Hydrogens

So you know what H20 looks like but what about it?

• In each water molecule, the oxygen atom attracts more than its “fair share” of electrons

Polar molecules: have slightly charged ions.

Slightly positively charged regionsHydrogen 'acts' positive

This is what causes water to be po!ar!

Slighty negativly charged regionOxygen 'acts' negative

• However, water is neutral (equal number of electrons and protons) so it has a Zero Net Charge

One hydrogen bond is weak, but many hydrogen bonds are strong! The negative Oxygen end of one water molecule is attracted to the Positive Hydrogen end of another water molecule to form a Hydrogen Bond.

When water molecules attach to other molecules

When water molecules attach to each other

Hydrogen bonds lead to 3 important properties

High Specific Heat: Difficulty for water to change temperature

Cohesion

• The attraction between particles of the same substance (why water is attracted to itself)

• Results in Surface Tension (a measure of the strength of water’s surface)

• Produces a surface film on water that allows insects to walk on the surface of the water

Adhesion

• Attraction between two different substances.• Water will make hydrogen bonds with other surfaces such as glass, soil, plant tissues, and cotton. • Capillary action- water molecules will “tow” each other along, when in a thin glass tube • Example: transpiration process which plants and trees remove water from the soil, and paper towels soak up water. *Gives water the ability to “climb” structures

Together they make a solution!

SOLVENT

Substance in which the solute dissolves -In the majority of cases water is a solvent

SOlute

Substance that is being dissolved -Like sugar

versus

Can you think of an example?

something to keep in mind

Non-polar solvents will dissolve non-polar solutes

Polar substances and nonpolar substances generally remain separate.

Polar solvents will dissolve polar solutes

"Like dissolves like"

Ionic

involves the electrostatic attraction between oppositely charged ions, or between two atoms with sharply different electronegativities

Other types of bonds

CovaleNT

This bond is done through sharing. Some atoms can bond by sharing electrons.