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 of 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 *Gives water more stable. structure than other Hydrogen needs 1 liquids* more electron to be stable.

Polar Molecule  A water molecule is polar  opposite ends of the molecule with opposite charges.

Adhesion Cohesion  Ability of water to stick to  Ability of water to “stick” to other surfaces itself.  Because water is polar it is attracted to other water  Examples: molecules.  Water on your skin  Example  Water on the window  The water in this picture.  Why water continues to flow out 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 on 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 has a high heat capacity. Water Large bodies of water absorb heat and provide a stable and fair weather climate. Water is cooling! Do I look cool?

Gas Solid Liquid

Model of water molecules as a solid, liquid and a gas. Properties of each phase of matter Ice Crystals: Gas/Steam: Liquid water: -When water freezes, -Molecules are widely -Molecules are closer molecules move away separated . together than ice (solid from each other and -Molecule move around water) expand. freely -Molecules move slightly. -Molecules move rapidly -Molecule move slowly -When ice forms it floats it is less dense than water. DENSITY=0.0006 g/mL DENSITY = 1.0 g/mL DENSITY = .92 g/cm 3