1. Pg. 12 RTW: Why do you think life depends on water?
Monday, August 28th
Pg. 12 RTW: Why do you think life depends on water?
Objective: I will be able to describe the unique properties of water that allow for life on Earth.
Agenda:
Properties of Water Lab
Answer questions and form an explanation (hypothesis/reason) for what’s happening at each station
Homework:
None 

3. NO RTW TODAY
DO NOT TOUCH MATERIALS ON THE DESK. BAGS UP FRONT DURING LABS! You will need your packet from yesterday and a pen/cil

5. Tuesday, August 29th
Objective: I will be able to describe the unique properties of water that allow for life on Earth.
Agenda:
Finish Properties of Water Lab
Answer questions and form an explanation (hypothesis/reason) for what’s happening at each station
Homework:
None 

6. Pg. 12 RTW: What does the word “polar” mean to you?
Wednesday, August 30th
Pg. 12 RTW: What does the word “polar” mean to you?
Objective: I will be able to describe the unique properties of water that allow for life on Earth.
Agenda:
Pretest: Properties of Water
Notes: Properties of Water pg. 15
Homework:
Finish Properties of Water Lab worksheet

7. Properties of Water
pg. 15 in ISN

8. INK PAIR SHARE
Why does it feel colder if you stick your hand in ice water compared to sticking your hand in the freezer?

9. Polar Bonds &
Hydrogen Bonds

10. Water’s unique properties allow life to exist on Earth.
Properties of Water
Water’s unique properties allow life to exist on Earth.
1.) Water is a POLAR molecule, which have slightly CHARGED regions.
Nonpolar molecules do not have charged regions.

11. 2.) Hydrogen Bonds form between slightly positive hydrogen atoms and slightly negative atoms.
Hydrogen bonds are responsible for several important properties of water:
High specific heat
Cohesion
Adhesion

12. Moderate Heat

13. 3.) Moderate Heat (High Specific Heat) – hydrogen bonds require a high degree of heat before they break, minimizing temperature changes.
75% of the earth is covered by water. The water serves as a large heat sink responsible for:
Prevention of temperature fluctuations that are outside the range suitable for life.
Coastal areas having a mild climate
A stable marine environment

14. Cohesion

15. 4.) Cohesion – the property of water molecules being attracted to
EACH OTHER.
Causes surface tension (how water stays in a drop if you put it on the table instead of spreading out)
Makes a skin-like surface over the water
Also helps the water go up the capillary tube by pulling the others along.

16. Thursday, August 31st
Pg. 12 RTW: Describe what you see and what you think happened with the colored water and beakers we set up yesterday.

17. Objective: I will be able to describe the unique properties of water that allow for life on Earth.
Agenda:
Finish Notes: Properties of Water pg. 15
Homework:
None 

18. Adhesion

19. 5.) Adhesion – the property of
water molecules being attracted to OTHER types of molecules.
Causes “capillary action” The ability of water to crawl up a very skinny tube.
This is because the water molecules are
being attracted to the molecules of the
glass tube.

20. Universal solvent

21. INK PAIR SHARE
Why did the paper float on the water and not on the water and detergent mix?

22. 6.) Universal Solvent = ability to dissolve compounds.
solution
6.) Universal Solvent = ability to dissolve compounds.
Solution is formed when one substance dissolves in another.
Solvents (such as WATER) dissolve other substances.
Solutes (such as salt or sugar) dissolve in a solvent.
“Like dissolves like.”
Polar solvents dissolve polar solutes.
Nonpolar solvents dissolve nonpolar solutes.
Polar substances and nonpolar substances generally remain separate. Example: water and oil

23. density

24. INK PAIR SHARE
Why is it important to life that ice creates a crystal lattice and floats? HINT: Think of the life in oceans or lakes

25. 7.) Density = Mass/Volume (how compact an object is)
Above 4ºC density
decreases w/ increasing
Temperature
4ºC & below- reverses
At 0ºC molecules form a
crystal structure-
Ice Floats!!!!

26. pH

27. 8.) pH = measure of the hydrogen ions (H+) in water.
An acid releases a hydrogen ion when it dissolves in water. Acids have a high H+ concentration and a pH less than 7.
A base removes hydrogen ions from a solution. Bases have a low H+ concentration and a pH greater than 7.
A neutral solution has a pH of 7.