Water
10
Objective Objective The students will The students will explain how water explain how water adheres to the surface adheres to the surface of a penny in terms of of a penny in terms of the molecular the molecular structure of water. structure of water.
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Transcript of Water
ObjectiveObjective
The students will explain The students will explain how water adheres to how water adheres to the surface of a penny the surface of a penny
in terms of the in terms of the molecular structure of molecular structure of
water.water.
How does this water strider skate on water?
The attraction is called a Hydrogen bond and the result is that water molecules demonstrate “cohesion” causing water to have a “strong
surface” called “surface tension”.
Water is a POLAR molecule: It has a partial negative and partial positive charge.
The hydrogen of one water molecule is attracted to the oxygen of another water
molecule like opposite poles of a magnet are!
polar = molecule with a partial positive and negative charge
cohesion = water attracted to other water molecules because of polar properties
adhesion = water attracted to other materials
surface tension = water is pulled together creating the smallest surface area possible
VOCABULARY
Because water is polar……
It is called a universal solvent. A solvent is a fluid that dissolves “other substances”.
The “other substance” added to the solvent is called the solute.
Solvent + Solute = Solution Solute
Solvent
Because water has both adhesive and cohesive properties, capillary action is present.
Capillary Action gives water its adhesive property. Water is attracted to some other material and through cohesion, other water molecules move too as a result of the original adhesion.
Ex: Think water in a straw Ex: Water moves through trees this way
Green Carnations?
