Warm Up: Write 10 facts you already know about water

Warm Up:

Write 10 facts you already know about water.

Water Unit

What is WATER?

Water is a molecule

It is also a compound. Why? What makes is a compound?

The word water usually refers to water in its liquid state.

What is WATER?

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

Structure of Water

One water molecule is:

Two hydrogen atoms (H2) chemically bonded to one oxygen atom (O)

Structure of Water

Hydrogen ends are slightly more positive.

Oxygen end is slightly more negative. This means that

water is a polar molecule

WHY?????

Models of Water Molecules

Let’s let TED explain it!

Properties of Water

Water has four properties that make it unique.

1. Cohesion

2. Adhesion

3. Capillary Action

4. Universal Solvent

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.

SURFACE TENSION PICS

More SURFACE TENSION PICS

Surface Tension – Cohesion at the surface creates a thin “skin” on the water.

More SURFACE TENSION PICS

Adhesionis when water molecules stick to other materials

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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

Capillary ActionA meniscus is when

the liquid “climbs” the sides of a graduated cylinder.

glass su

rface

Water in Space

Universal SolventWater’s polarity gives it the ability to dissolve many different substances.

Almost every substance can dissolve in water over time.

Universal Solvent

Almost…

3 StatesWater is the only substance on Earth that commonly exists in all 3 states.

Liquid – WaterSolid – IceGas – Water Vapor

Changing States

Water can easily move between its three different states through several natural processes

WATER

Another way of looking at changes in state!

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!)