2. Properties of Water Covalent bonding - sharing of electrons between non-metals Polar covalent bond – unequal sharing of electrons

3. Properties of Water Covalent bonding vs. Hydrogen bonding Covalent Bond Hydrogen Bond

4. Roles of Water Weathering & erosion

5. Roles of Water Habitat

6. Properties of Water In order to raise the temperature of water, the average molecular speed has to increase. It takes much more energy to raise the temperature of water compared to other solvents because hydrogen bonds hold the water molecules together! Water has a high heat capacity. “ The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius. ” High Heat Capacity

7. Roles of Water Coolant

8. Roles of Water Stabilizes coastal temperatures

9. Roles of Water Solute – substance dissolved in a solvent to form a solution Solvent – fluid that dissolves solutes Eg. Dissolve nutrients, carries waste, drinks, cleaning products Water is the universal solvent

10. Metabolism : Making Biological Molecules

11. Add water to metabolize large organic polymers

12. Roles of Water Dissociation of an ionic lattice

13. Roles of Water Hydration of a soluble molecular compound Eg. sugar

14. Properties of Water cohesion = water attracted to other water molecules because of polar properties Water is Cohesive

15. Properties of Water adhesion = water attracted to other materials Water is Adhesive

16. Properties of Water surface tension = water is pulled together creating the smallest surface area possible; liquids with low surface tension tend to spread out Water Has a High Surface Tension

17. Properties of Water Capillary Action Because water has both adhesive and cohesive properties, capillary action is possible.

18. Properties of Water Density Water is less dense as a solid! This is because the hydrogen bonds are stable in ice – each molecule of water is bound to four of its neighbors. Solid – water molecules are bonded together – space between fixed Liquid – water molecules are constantly bonding and rebonding – space is always changing

19. Properties of Water Frozen water expands and is less dense

20. Properties of Water So, can you name all of the properties of water? Adhesion Cohesion Capillary action High surface tension High heat capacity Less dense as a solid than a liquid Boiling Point Melting Point Density Viscosity