Water The Universal Solvent Adhesion VS Cohesion Cohesion

Water The Universal Solvent

Adhesion VS Cohesion • Cohesion – is the • ability of water to stick to itself. Adhesion – is the ability of water to stick to things other then itself.

WHY does this occur? • This occurs because molecules of water are POLAR!!! – Partial negative and partial positive • Opposites attract and create Hydrogen Bonds

Water the Source of Life on Earth • The unique physical properties are due to hydrogen bonding. These Include – a high heat of vaporization – strong surface tension – Adhesion and Cohesion – high specific heat (the ability to absorb/transfer heat) – nearly universal solvent properties of water (most important) • Water is polar which allows it to dissolve most substances. – All of the chemical reactions that happen in the cells are all happening in the cytoplasm which is made up of mostly water. • Liquid water makes up 65% of the human body and carries – – Oxygen and carbon dioxide nutrients Wastes Hormones

Surface Tension • Surface Tension - is • an effect within the surface layer of water that causes that layer to behave as an elastic sheet. Hydrogen Bonds between surface water molecules creates surface tension

Capillary Action • Capillary Action - is the ability of water to be drawn upwards against the force of gravity. – Capillary action is how plants are able to move water against the force of gravity – Capillary action uses both adhesive and cohesive properties of water