Do Now: Pick up notes, article, worksheet, foil + toothpick & copy down table of contents

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Felix Cross
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1 Do Now: Pick up notes, article, worksheet, foil + toothpick & copy down table of contents Wait for Ms. Greco to come around and spray your foil See if you can connect all of the water droplets using a toothpick Do you know what property (characteristic) of water this is?

2 Properties of Water Objective: SWBAT Explain how the polarity of a water molecule contributes to its unique properties. List and describe how each of the four properties of water make it essential for life on Earth Essential Question: How do the unique properties of water allow life to exist on Earth?

3 Properties of Water Notes You must fill in the graphic organizer as I go through the slides! Do not talk without raising your hand and being called on

Polar Molecules Molecules that have regions with

H20 is polar b/c it has a slightly positive and a

4 Polar Molecules Molecules that have regions with slight electrical charges due to uneven pull on electrons Polarity- n. The state of having 2 opposite ends. H20 is polar b/c it has a slightly positive and a slightly negative end. What else has a positive and negative end? When else do we use the word polar?

5 Nonpolar Molecules Molecules without charged regions due to equal pull on electrons

6 What is the Structure of a Water Molecule? 1. Water is composed of 1 oxygen atom and 2 hydrogen atoms. 2. The oxygen has a negative charge and the hydrogen has a positive charge. 3. The hydrogen atoms are always in the ear position. Draw this in your notes

7 What is Hydrogen Bonding? The bond between the O and H atoms of different water molecules. The positive H is attracted to the negative O. Hydrogen bonds are very weak. *Label positive and negative charges on your diagram

8 1. What is Cohesion? A. Cohesion is the attraction of water molecules to each other. 1. Co= together (ex: cooperate, covalent etc.) hesion = to stick Water Molecules stick together Surface Tension

9 What causes cohesion? Hydrogen bonds hold together the water molecules.

10 2. What is Adhesion? A. Adhesion is the attraction of water molecules to other substances. Water molecules stick to other substances B. Adhesion is also caused by hydrogen bonds. How does water get to the top of the tree if I only watered the soil?

11 The water sticks to the inside!

12 Practice with Adhesion & Cohesion What property of water does this each picture represent?

13 Practice with Adhesion & Cohesion 4. What does co- mean?. 4. What property of water allows water spiders to walk across the surface of a pond?. 5. Why is water able to move against gravity?

14 3. High Specific Heat A. It takes a lot of energy to change the temperature of water. B. Water can protect an ecosystem from extreme temperature differences. In the picture, what is going to heat up and cool down faster? Land or water?

15 Rank the following in the order which they will cool down at night: Air, plants, water, soil.

16 What is Solubility? A. Solubility is the ability of substances to dissolve in water. 1. Water is called the universal solvent because it can dissolve almost anything!

17 Water is the universal solvent! Solution - a mixture of two or more substances that is the same throughout (homogenous) : aqueous solutions Solvent dissolves other substances Solute dissolves in the solvent

18 Why is water such a great solvent? Because the positive and negative ends act like magnets that pull apart other substances. Na Cl

19 How does solubility impact life? We are 70% water! Most our tissues are full of water that has substances dissolved in it. Why do you think tears and sweat are salty?

20 Acids, Bases, and Neutrals Acids: High concentration of hydrogen atoms ph: Low ph (<7) Neutral: Neither acid nor basic ph: ph of 7 Basic: Low concentration of hydrogen atoms ph: High ph (>7)

21 What is Density? Density is how tightly packed the atoms in a substance are. 1. Objects with higher density will sink. 2. Objects with lower density will float.

22 Is ice less dense than water? Why? Ice, unlike most solids, is less dense than water. Because Hydrogen bonding creates more space between water molecules so they spread out. *Animated biology Liquid Water Solid Water (ICE)

23 Why does water density impact life? 1) Floating ice will keep the water underneath warm. This allows fish and other organisms to survive in the winter. What would happen to pond life if ice was more dense?

24 How does water density impact life? 2) Many animals in the arctic live on ice. ex: polar bears, seals, (What else?)

25 Read article Life s Little Essential Answer the following questions on the back of the article Why is being in a liquid form essential for sustaining life? What is unique about water occurring naturally on Earth? Why is having a high heat capacity a very important property of water? Describe what DNA would look like without water. Vocab: Rejoinder: A witty or sarcastic remark Sine qua non: Something that is absolutely necessary Ubiquity: Presence everywhere or in many places simultaneously Hydrological Cycle: Water Cycle

26 Complete Properties of Water Practice Worksheet Cross out numbers 6, 8, 9! You may work with a partner When the timer goes off (20min) go back to your seats and sit silently

27 Exit Ticket No talking or electronics = zero Raise your hand if you have a question Keep your eyes on your own paper Flip paper over, put pencil down when finished

Sit with your group from yesterday. You have 5 minutes to finish your poster and be ready to present your property of water to the class.

To get out: Yellow Packet To pick up: Poster and markers Sit with your group from yesterday. You have 5 minutes to finish your poster and be ready to present your property of water to the class. Homework: