Presentation on theme: "1. 2 Water is Polar The oxygen end (pole) of water has a negative charge The hydrogen end (pole) has a positive charge."— Presentation transcript:
2 Water is Polar The oxygen end (pole) of water has a negative charge The hydrogen end (pole) has a positive charge
3 Hydrogen bonding The hydrogens of one water molecule are attracted to the oxygen from other water molecules. This attractive force is called hydrogen bonding
4 Hydrogen bonding IceLiquid
5 Cohesion and Adhesion Hydrogen bonds give water its cohesive and adhesive properties. Cohesion-water is attracted to other water Adhesion-water attracted to other materials
6 Surface tension Cohesion of water molecules at the surface of a body of water All the water molecules on the surface of the water are 'holding' each other together or creating surface tension. Surface tension allows water striders to 'skate' across the top of a pond.
7 Candy Question What is the difference between adhesion and cohesion?
8 Capillary Action Water climbs up capillaries (like straws or plant stems) The water molecules are attracted to the capillary molecules. When one water molecule moves closer to the capillary molecules the other water molecules (which are cohesively attracted to that water molecule) also move up into the capillary. Capillary action is limited by gravity and the size of the capillary. The thinner the capillary the higher up capillary action will pull the water
9 Candy Question Why do coastal areas have a more constant temperature? Why are they about the same temperature in summer and winter?
10 High Specific Heat Water does not change temperature easily This is why coastal areas have a more constant temperature. This is also why life forms have a more constant temperature.
11 Solutions Solutions are mixtures where the solute is evenly distributed in the solvent (completely dissolved) Water is a very good solvent
12 Candy Question When you make salt water, is salt the solute or the solvent? Is water the solute or the solvent?
13 Candy Question How much of the human body is made of water?
14 Water and Life Water is essential for life. Water is the major constituent of almost all life forms. Most animals and plants contain more than 60% water by volume. Without water life would probably never have developed on our planet.