Water: Life’s Supporting Compound Chapter 2 presents basic information on the science of elements, compounds and chemical reactions. Our study focuses on how water’s unique chemical structure can explain the many aspects of life like 1.How water moves from roots to leaves in plants 2.Why lakes do not freeze solid in the winter 3.How water can dissolve many compounds 4.Why pollen grains can float on the surface of a pond 5.Why athletes do not over heat during a game The journey to understand water begins with a penny.

How many drops of water can you place on the surface of a penny?

Check out the drop of water

Draw (4) water molecules? A)Label all the hydrogen and oxygen atoms on each molecule. B)How many covalent bonds are found on one water molecule?

Watch the video on the Properties of Water. List the properties that may be used to explain the penny activity. Properties of Water

We can use the properties of water to explain why the large number of drops can be placed on the surface. Use the properties that you listed and discussed to explain the Outcome of the penny and water activity.

What happens to this setup? Watch the video clip. Use hydrogen bonds being disrupted to craft an answer.

Can you explain how Hydrogen bonds form?

The drops of water on the leaves are like the drops on the penny -Cohesion causes water to form drops Cohesion: attraction of water to water -Surface tension causes the drops to be spherical -Adhesion keeps the drops in place Adhesion: attraction of water to unlike substance 10

Water Drop Shapes -Water has cohesion to itself and forms a nice, round drop -Round drop on wax paper (not strong adhesion to water) -As adhesion to glass is stronger and pulls the water, it makes a flatter drop 11

What Happens to Water on Two Different Surfaces?

Video links about Water’s Life Supporting Properties. Salt Dissolving in Water All About Water Why does ice float? Transpiration Everyday Examples of the Properties of Water water strider walking on water