Warm-up What do you already know about chromosomes? Tell me at least one thing!
Warm Up: Write 10 facts you already know about water.
Transcript of Warm Up: Write 10 facts you already know about water.
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Warm Up:
Write 10 facts you already know about water.
Water Unit
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What is WATER?
Water is a molecule
It is also a compound. Why? What makes is a compound?
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The word water usually refers to water in its liquid state.
What is WATER?
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What is WATER?Pure water has NO smell or taste,
and a pH of 7 so it is not acidic or basic
That makes it NEUTRAL
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Structure of Water
One water molecule is:
Two hydrogen atoms (H2) chemically bonded to one oxygen atom (O)
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Structure of Water
Hydrogen ends are slightly more positive.
Oxygen end is slightly more negative. This means that
water is a polar molecule
WHY?????
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Models of Water Molecules
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Let’s let TED explain it!
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Properties of Water
Water has four properties that make it unique.
1. Cohesion
2. Adhesion
3. Capillary Action
4. Universal Solvent
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Cohesion is when water molecules stick to other water molecules (attract each other like magnets)
Cohesion at the surface of water is called surface tension.
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SURFACE TENSION PICS
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More SURFACE TENSION PICS
Surface Tension – Cohesion at the surface creates a thin “skin” on the water.
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More SURFACE TENSION PICS
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Adhesionis when water molecules stick to other materials
Dew
–w
ater
dro
pson
a s
pide
r’s
web
.
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Capillary ActionWhen a liquid moves
up very narrow tubes because of cohesion and adhesion against gravity.
Ex: plants bring water
up through their roots to their stems and leaves
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Capillary ActionA meniscus is when
the liquid “climbs” the sides of a graduated cylinder.
glass su
rface
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Water in Space
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Universal SolventWater’s polarity gives it the ability to dissolve many different substances.
Almost every substance can dissolve in water over time.
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Universal Solvent
Almost…
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3 StatesWater is the only substance on Earth that commonly exists in all 3 states.
Liquid – WaterSolid – IceGas – Water Vapor
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Changing States
Water can easily move between its three different states through several natural processes
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WATER
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Another way of looking at changes in state!
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Websites from the Presentation
1. http://www.brainpop.com/science/earthsystem/water/2. http://ed.ted.com/lessons/how-polarity-makes-water-behave-strangely-christina-kleinberg3. http://www.youtube.com/watch?v=oAY3yISf-24
Other cool water related videos
4. http://www.surfline.com/video/premium-partner-video/rubber-souls-new-zealand_103895(Surfing)
5. https://www.youtube.com/watch?v=BickMFHAZR0(Capillary action in trees)
6. https://www.youtube.com/watch?v=ph8xusY3GTM(Super-cooled water)
7. https://www.youtube.com/watch?v=D-wxnID2q4A(Walking on water – sort of!)