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# 2/22/12

## by demilorant on Mar 21, 2012

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## 2/22/12Presentation Transcript

• 2/23/12 A/B DayLEQ: How does the polarity of waterinfluence its physical properties?1. What is buoyancy?2. What is surface tension?3. What is more dense—warm water or coldwater?4. Why do we call water the universal solvent?5. Copy and complete: Water’s [high/low]specific heat means that it requires a [high/low]amount of heat for water to get hot!
• Track your progress: Unit 2 Quiz D-1 = 96 -9 = 64 -17 = 32-2 = 92 -10 = 60 -18 = 28-3 = 88 -11 = 56 -19 = 24-4 = 84 -12 = 52 -20 = 20-5 = 80 -13 = 48 -21 = 16-6 = 76 -14 = 44 -22 = 12-7 = 72 -15 = 40 -23 = 8-8 = 68 -16 = 36 -24 = 4
• Today’s LEQ: How does the polarity ofwater influence its physical properties?By the end of today, you should be able to…1. Describe the polarity of water.2. Explain why polarity creates cohesion and adhesion of water
• Focus Vocabulary109. Polarity110. Cohesion111. Adhesion
• CONTEXT CLUES:“Those two twins are polar opposites. They are nothing alike.”“The cowboys are such a cohesive team. They practice together, play together, and even eat all of their meals together!”“The stickers that you put on your car have two sides—one side has a design on it and the other side is the adhesive side.” Stop and Jot: Write your own definition of
• Polar/Polarity
• Cohesive/Cohesion
• Draw this in your notes:Polarity: uneven charges in a watermolecule; causes water to be sticky!Cohesion: Adhesion:
• Draw this in your notes:
• Discovery Education Video:Water’s molecular structure (How Stuff Works)
• Water sticks to itself.Water sticks to other stuff.
• Draw this in your notes:Polarity: uneven charges in a watermolecule; causes water to form bonds!Cohesion: the Adhesion:tendency for watermolecules to stick toother water moleculesEx. Water drops sticktogether
• Cohesion Demo:Can you get water to stick to itself?Make a C with your fingers
• Surface Tension—this happens because of COHESION!
• Draw this in your notes:Polarity: uneven charges in a watermolecule; causes water to form bonds!Cohesion: the Adhesion: thetendency for water tendency of water tomolecules to stick to stick to otherother water molecules substancesEx. Water drops stick Ex. Water sticks totogether other things
• Adhesion Demo: Can you get water to stick to other stuff?Make a C with your fingers
• WaterOther stuff! Water Water
• Water sticks to a spider web
• Water sticks together over the edge of a glass
• Water has uneven charges
• Water stays together on saran wrap
• Water sticks together in drops
• Water sticks to blood cells
• Water creates bonds
• Water sticks to a windshield
• Water sticks to a leaf
• Water has a positive and negative end!
• Water ripples do not break the surface