1. Properties of Water

2. WARM UP 10/23/18 GET YOUR IAN Folders OUT TODAY!
Pick up the notes packet on the table and put it in your IAN FOLDER.
ESSENTIAL QUESTION:
Why does water pool in one place and cause major flooding events like what happened in Hurricane Harvey?
Write the best possible answer that you have to this question in your IAN.

3. Balloon Activity
There is a Balloon at every sink. Have someone inflate it and tie it off.
Turn the water on as a very thin stream. Rub the balloon on someone’s head and hold it near (but not touching) the thin stream of water.
Look closely. What happens?

4. Quick Write for 2 minutes:
What did you observe? 1

5. Covalent Bond vs. Hydrogen Bond
VIDEO
Covalent Bond

6. Water is Polar Oxygen has a partial (-) charge H
Hydrogen has a partial (+) charge
Oxygen has a high attraction to Hydrogen’s valence electrons
Causes water to be POLAR, like a magnet

7. How do water molecules bond to each other?
Try bonding with your classmates.

8. DEMO What will happen to a Styrofoam cup when you put it in water?
What will happen when you put it in Acetone?
WRITE down your observations in your notes!

9. Polarity of Solvents LIKE Dissolves LIKE
Solvents dissolve LIKE substances
For instance, POLAR solvents (like water) dissolve only POLAR or IONIC substances
In addition, NON-POLAR substances (like acetone) dissolve only NON-POLAR substances.
LIKE Dissolves LIKE
Why do you think this Oil won’t dissolve in water?

10. Research Topic:
Why does ice FLOAT? 1

11. WARM UP 10/25/18 DRAW this picture in your IAN Folder.
LABEL ALL of the Covalent and Hydrogen Bonds
EXPLAIN or DESCRIBE the significance of each bond.
Based on your explanations, how are the molecules in the picture above holding together?
Why is this an important property of the water molecule?
AFTER YOU FINISH THE WARM UP
Turn to page 2 of your Properties of Water Notes.
Describe what you saw with the food coloring and water demo at the end of class on Tuesday.
2/17/2019

12. Cohesion
Water molecules attracted to each other creating surface tension 1

13. Adhesion
Water molecules are attracted to other substances such as glass, soil, and plant tissues 1

14. Mini - Lab Go to your lab tables
GET a piece of waxed paper, a dropper bottle, and a capillary tube
Put one drop of water on the wax paper and put the end of the capillary tube in the water
WATCH what happens and record your observations
Return to your table

15. Capillary Action Ability of water to “climb” up against gravity
Results from Cohesion + Adhesion
EX: Water moving up the roots to the top of the tree 1

16. Research Topic:
Why does ice FLOAT? 1

17. Water is Less Dense as a Solid
Water in a liquid state keeps rebonding and changing its shape
Water in a solid states has a fixed shape with space in between making it less dense 1

18. Quick Write – 2 minutes Why is this important in nature?
If ice were more dense than liquid water, how would this impact the survival of marine life?

19. Space Video

20. WARM UP 10/29/18
Which of the following diagrams indicates how water molecules form hydrogen bonds? A. C. B. D.
Explain the reasoning for your answer.
Describe and explain HOW the water molecules form Hydrogen Bonds between molecules.
DRAW 3 water molecules aligned with each other based on your answer to the question above AND explain how these molecules line up the way they do.

21. Let’s Check our Answers from our QUICK WRITE on Friday!
If ice were more dense than liquid water, how would this impact the survival of marine life?
VIDEO 1

22. DEMO
What do you think will happen to a paper clip when it is put on top of water?
Why do you think this will happen?

23. Mini – Lab 1
Go to your lab tables and complete the Station 2 & 3 Activities using the instructions.
You will only be given 7 minutes to complete both activities AND answer the questions in your IAN.
When finished, write about what you observed in your notes UNDER Surface Tension.

24. What is this property? What do you see happening here?
How can you explain this?
This Photo by Unknown Author is licensed under CC BY-SA

25. Surface Tension
The tightness across the surface of water caused by adhesion
Makes the surface act like a solid 1

26. Mini – Lab 2 DEMO Predict what will happen:
Which balloon will pop first, the one with water in it or the one without water in it?
When the DEMO is finished, write about what you observed in your notes UNDER Specific Heat.

27. High Specific Heat
Amount of heat (energy) required to raise the temperature of water by 1⁰ C
Example:
WATER = 75°F
BEACH = 110°F 1

28. Balloon Video

29. High Specific Heat
When hydrogen bonds break they absorb a lot of (heat) energy, leaving the water molecules behind cooler.

30. D. Which is stronger in this property, Adhesion or Cohesion? Why?
WARM UP /30/18
Name the Properties! A.
No text C.
D. Which is stronger in this property, Adhesion or Cohesion? Why? D. E. B. 1. 2.

31. Mini – Lab 3 DEMO Predict what will happen:
Which of the following actions will increase the rate of dissolving rock salt?
Agitation Large Sample size
Small Sample size Small surface area
Cool Water Crushing sample
Hot Water Large surface area
When the DEMO is finished, write about what you observed in your notes UNDER Universal Solvent

32. How does Water dissolve an ionic compound like salt?
Watch the following video and write down your observations

33. How does the water molecules separate the ions in salt?
Table Talk – 1 minute
Question:
How does the water molecules separate the ions in salt?
Answer: electrical attraction Because Water is polar!
The Water Molecules are BREAKING THE IONIC BONDS between the anion and cation in the salt crystals.
This occurs because water has charged ends so the positive end of a water molecule is attracted to the negative chlorine ion, and the negative end of a water molecule is attracted to the Positive sodium ion.

34. Universal Solvent
Water is called the universal solvent because it dissolves more substances than any other liquid
Water dissolves polar substances and ionic compounds due to its polarity. 1

35. Rate of Dissolving
The rate of dissolving is how quickly a solute can be dissolved by water.
The rate of dissolving can be increased by:
Increasing the surface area of the solute (crushing)
Agitating (or stirring) the mixture
Increasing the temperature of the solvent

36. Blast from the Past! Why doesn’t oil dissolve in water?
Write your explanation in the space provided on the last page of your notes.

37. NEXT TASK Get out your iPad Go to Module 4 in CANVAS
Open the NEARPOD for Phase changes, Heating Curve & Solubility
Complete your Cornell Notes
Open the assignment Phase Changes, Heating Curve & Solubility Notes Questions in CANVAS
Complete the questions using your notes and submit the assignment to CANVAS.
Tomorrow’s Question: How do you know if something is an Acid or a Base?