1. Properties of Water PG 50 of ISN
Pg Date Title Type
EQ/ I Can Notes
lizard/water slider/word friendly Notes
skip skip skip
water properties Notes
EQ: Why is water important? How can I differentiate the properties of water?
I Can distinguish the differences in the properties of water.

2. Welcome!  Warm Up 10/14/14 PG 50 of ISN under I Can
Voices are at “0”
****Write the questions****
This is a water molecule.
What is the chemical formula for water?
2. Draw and label this molecule on your paper.
3. What do you already know about water?

3. Tree Map of Water Properties
Universal
Solvent
Density
And
Buoyancy
Specific
Heat
Polarity
Cohesion
and
Adhesion

4. Universal Solvent
Water is called the "universal solvent" because it dissolves more substances than any other liquid.
Solvent- in a solution, the liquid in which a solid dissolves
Solute- in a solution, the molecule dissolved in the solvent
Brainpop – water

5. Cohesion and Adhesion
Cohesion-the force that holds molecules of a single material together
Adhesion-the attractive force between two different substances that are in contact with each other

6. Cohesion + Adhesion = Surface Tension
Jesus Lizard
Water Strider
See water strider information on next slide.

7. Water Striders
Description: Have you ever been looking at a pond or vernal pool and thought you saw a bug walking on the water? Was it moving so quickly it seemed to glide across the surface? Seems far-fetched and a trick of the eye, right?
What you saw on the surface of the pond was a water strider. They are small insects that evolved for life on top of still water. Water striders use the surface tension of water to their advantage so they can “walk on water”.
Water acts different at the surface. Water molecules are attracted to each other, and like to stay together, especially on the surface where there is only air above. The attraction between water molecules creates tension and a very delicate membrane. Water striders walk on this membrane. The secret of the water strider is its legs! The legs have tiny hairs that repel water and capture air. By repelling water, the tiny water striders stand on the water’s surface and the captured airs allows them to float and move easily.
Water striders are about a half inch long with a thin body and three sets of legs. A water strider’s front legs are much shorter than the two sets of back legs.
The shorter legs are used for catching and holding onto food. Water striders eat insects and larvae on the surface of water, such as mosquitoes and fallen dragonflies.
Habitat and Range: Look for water striders on the surface of calm or slow-moving water throughout the continental U.S.  They prefer ponds, vernal pools, and marshes.

8. Polarity
Water is polar because the oxygen has a partial negative charge and the hydrogen atoms each have a partial positive charge; polar molecules interact with other polar and charged molecules and ions O- H+ H+

9. Density and Buoyancy
Density: the amount of the stuff/material in an object
Density = Mass/Volume
Buoyancy: Property that determines if it sinks or floats?
Used to determine if objects will float on the surface of water.
How a submarine works…

10. Density Triangle

11. Ice is about 10% less dense than water at 4oC.
When water reaches 0oC, water becomes locked into a crystalline lattice with each molecule bonded to to the maximum of four partners.
As ice starts to melt, some of the hydrogen bonds break and some water molecules can slip closer together than they can while in the ice state.
Ice is about 10% less dense than water at 4oC.
Fig. 3.5
Copyright © 2002 Pearson Education, Inc., publishing as Benjamin Cummings

12. Water is Less Dense as a Solid
Which is ice and which is water? 1

13. Water is Less Dense as a Solid
Ice 1

14. Specific Heat
The amount of heat required to raise the temperature of 1 kg of a substance 1 degree Celsius
Water has a high specific heat index. This means that Water can absorb or release a lot of heat before it begins to change temperature
Specific Heat Animation

15. Homework Complete the density worksheet. Due Wed 10-15-14.
Complete missing assignments. Due Mon
Complete Test Evaluations assignments. Due Mon

16. Properties of Water Vocab (13 words)
Adhesion – the tendency of water to stick to other substances.
Cohesion – the attractive force between water molecules.
Density – the measure of mass of a substance per unit volume
Polarity – uneven distribution of charges across a molecule.
Specific Heat – the amount of heat needed to raise the temperature of one gram of a substance by one degree Celsius.
Surface Tension – the force that acts on the particles at the surface of a material.
Universal Solvent – the quality of water that makes it able to dissolve more substances that any other solvent can.

17. Properties of Water Vocab Continued
Water cycle– the way that water moves between being water vapor to liquid water and then back to water vapor.
evaporation– the process of a liquid becoming vaporized (liquid to gas)
condensation – is the process by which water vapor in the air is changed into liquid water.
precipitation– Any form of water, such as rain, snow, sleet, or hail, that falls to the earth's surface.
transpiration – the process of water movement through a plant and its evaporation, such as from leaves but also from stems and flowers.
infiltration – having the ability to be dissolved in another substance.

18. Additional Properties of water vocabulary
Buoyancy – the ability of a fluid to exert an upward force on an object that is immersed in the fluid
Absorbency – the ability to take in a material
Capillary Action – the process that moves water through a narrow porous space
Insoluble – not soluble
Soluble – having the ability to be dissolved in another substance

19. Achievement Series # 7
7) Which will most likely result if there is increased upwelling in a coastal area? A. more aquatic life B. less nutrients in the water C. higher water temperatures D. fewer nitrates

20. Achievement Series # 8
8) Which best determines the health of a lake used as a source of freshwater? A. its depth and width B. its temperature and pH C. its location and depth D. its temperature and depth

21. Achievement Series # 26
26) Why is water from an aquifer more likely to be cleaner than water from other sources?
A. because it forms where fresh and salt water meet
B. because it receives water directly from precipitation
C. because it rises to the surface near the ocean
D. because pollutants are filtered by rock and soil deep within Earth

22. Achievement Series # 27
27) In which oceanic zone do clams and crabs survive by burrowing in the sand?
A. oceanic
B. intertidal
C. deep ocean
D. open ocean

23. Achievement Series # 28
28) If a body of water has high turbidity levels, what can most likely be concluded?
A. It has a low pH.
B. It is unsafe to drink.
C. It is too hot to drink.
D. It contains a lot of chemicals.

24. 46) Which best describes the characteristics of a river basin?
Achievement Series # 46
46) Which best describes the characteristics of a river basin?
A. the land drained by a river and its tributaries
B. the land formed when rivers create estuaries and marshes
C. the land at the mouth of a river where water flows into the ocean
D. the land formed as a result of a river flooding

25. Achievement Series # 47
47) Which factors can have the greatest effect on the health of a river system?
A. type of soil and salinity
B. nitrate levels and turbidity
C. human consumption and pH
D. natural disasters and tidal changes

26. Achievement Series # 48
48) In the United States, which is responsible for ensuring the safety of the country’s drinking water?
A. Environmental Protection Agency (EPA)
B. Food and Drug Administration (FDA)
C. National Oceanic and Atmospheric Administration (NOAA)
D. Center for Disease Control (CDC)