In all phases of matter. Properties of Water Polar molecule - - PowerPoint PPT Presentation

In all phases of matter….

Properties of Water

Polar molecule Cohesion Adhesion Universal solvent

• f life

Surface Tension Capillary Action Heat Sink

Why does water form?

In a water molecule two hydrogen atoms form single covalent bonds with an oxygen atom. The bonds are formed to create a “stable” molecule. Oxygen needs 2 more electrons to be stable. Hydrogen needs 1 more electron to be stable. *Gives water more structure than other liquids*

Polar Molecule

 A water molecule is

polar

 opposite ends of the

molecule with

• pposite charges.

Adhesion

• Ability of water to stick to
• ther surfaces
• Examples:
• Water on your skin
• Water on the window

Cohesion

• Ability of water to “stick” to

itself.

• Because water is polar it is

attracted to other water molecules.

• Example
• The water in this picture.
• Why water continues to flow
• ut of the facet in a single

stream.

Water ……a.k.a the Universal Solvent

Water is the solvent of Life!

• Because of the polarity water is

able to dissolve the many substances. Solute – substance dissolved in a solvent to form a solution Solvent – fluid that dissolves solutes

Surface Tension

• Hydrogen bonds

make water cohesive and gives water surface tension.

• You can see

surface tension in the dome of water

• n the penny…it

jiggles like jello.

Capillary Action

Because water has both adhesive and cohesive properties, capillary action is present. Capillary action is one of the major reasons that trees and other plants can grow very tall. It is the ability of water to creep up thin tubes. Capillary Action = Ex: Think water in a straw Ex: Water moves through trees this way

HEAT Sink!!!

Water

Water has a high heat capacity. Large bodies of water absorb heat and provide a stable and fair weather climate. Water is cooling! Do I look cool?

Solid Liquid Gas

Model of water molecules as a solid, liquid and a gas.

Properties of each phase of matter

Gas/Steam:

• Molecules are widely

separated .

• Molecule move around

freely

• Molecules move rapidly

DENSITY=0.0006 g/mL Liquid water:

• Molecules are closer

together than ice (solid water)

• Molecule move slowly

DENSITY = 1.0 g/mL

Ice Crystals:

• When water freezes,

molecules move away from each other and expand.

• Molecules move slightly.
• When ice forms it floats it

is less dense than water. DENSITY = .92 g/cm3