Water's Life Supporting Properties
Presentation
•
Biology
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9th - 10th Grade
•
Medium
+5
Standards-aligned
Audrey Nebzydoski
Used 17+ times
FREE Resource
18 Slides • 14 Questions
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Water's Life Supporting Properties
Mrs. Nebzydoski's Biology Class
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Ionic Bond
Electrons are transferred between atoms
Positive and Negative Ions attact one another
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Covalent Bond
Electrons are shared between atoms
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Multiple Choice
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Multiple Choice
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Not all electrons are shared evenly....
This leads to Polar Bonds
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In a polar molecule
Electrons are not shared evenly
One side of the molecule appears to have a positive charge
One side of a molecule appears to have a negative charge
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Fill in the Blanks
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Polar Water Molecules "stick" together
We call this property of water COHESION
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Cohesion and Adhesion
water molecules stick to each other (cohesion)
water molecules stick to other things (adhesion)
surface tension allows water striders to "walk" on water due to cohesion
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Multiple Choice
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Cohesion and Adhesion are important for life
Adhesion allows water to get from the roots of the tree up to the top branches of the tree
Cohesion allows water molecules to leave from the leaves of a tree through transpiration
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Cohesion and Adhesion
Because water is a polar molecule...
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Water can regulate temperature changes
It has a high specific heat (resists change in temperature)
Bodies of water hold their heat (or lack there of) to regulate temperature of organisms living in them
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Evaporative cooling
When you are sitting on the beach or by a pool on a 90 degree day, you are hot. If you get into the water and then back out, you will no longer feel hot. This is because of evaporative cooling.
It is still 90 where you are sitting, but as the water goes from liquid to gas form on your skin, it takes energy. That energy leaves your body and "cools" you down.
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Multiple Choice
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Solid water (ICE) is less dense than liquid water
Ice floats!
As water molecules come together in a solid form, there is a lot of empty space (this causes a lower density)
If ice sank: ponds, lakes, and even the oceans would freeze solid
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Water molecules surround ions
When water molecules surround positive and negative ions the crystal "breaks" apart
Minerals, sugars, and salts are just a few of the solutes that dissolve in water to sustain life
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Poll
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Poll
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Multiple Choice
Water's Life Supporting Properties
Mrs. Nebzydoski's Biology Class
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