Water is essential to all life on earth.
Where is water found on earth?
earth.com
What is the chemical structure of water?
What is the chemical structure of water?
Molecular Formula
Why is water shaped as shown above?
Water is polar...what does this mean?
Water has an uneven distribution of electrons, giving it a slightly positive charge on one end and slightly negative charge on the opposite end. Which end is slightly negative below?
Protons = red
Electrons = blue
The atoms of water are held together by covalent bonds...what does that mean?
Why polar? Which has a higher electronegativity...oxygen or hydrogen?
Water’s polarity gives it characteristics that support life.
Let’s explore some of those characteristics.
Water Activities….
NGSS image
Water Activities:
-heated balloon
-water straws
-pepper water
-floating needle
-which is water?
-ice floats on liquid water
Water is cohesive (attracted to itself):
Water’s Cohesion and Life
Water is adhesive (attracted to other substances):
edinfromatics.com
bioninja
Universal solvent...
water dissolves stuff!
Khan A.Images
Water is less dense as a solid.
Crystalline structure of water makes it less dense as a solid.
BioLT Images
High Heat Capacity
Water can absorb more thermal energy than many other naturally occurring molecules allowing for more moderate or constant environments for organisms to exist.
1 calorie needed to raise water 1 degree Celsius
Water has to absorb 4,184 Joules of heat (1 calorie) for the temperature of one kilogram of water to increase 1°C. For comparison sake, it only takes 385 Joules of heat to raise 1 kilogram of copper 1°C.
USGS
Summary List
Some of the properties of water that support life are:
-Cohesive...water sticks to itself thereby creating a high surface tension
-Adhesive...water sticks to other things
-Universal solvent...dissolves many substances
-Water is less dense as a solid...allows it to float
-High heat capacity...remains in liquid form and moderates environment
Daily Video 1.1
Problem in the video asks you to describe which means give a picture of something in words.