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Water and It’s properties. Sections 2.1-2.4, 2.7-2.18. Do Now. 1. How do we rely or use water in our everyday life ? 2. Why is water so valuable?. Do Now. 1. Why were our results so scattered yesterday? 2. When we repeat the penny water/isopropanol today, what would you do differently?

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water and it s properties

Waterand It’s properties

Sections 2.1-2.4, 2.7-2.18

do now
Do Now
  • 1. How do we rely or use water in our everyday life?
  • 2. Why is water so valuable?
do now1
Do Now
  • 1. Why were our results so scattered yesterday?
  • 2. When we repeat the penny water/isopropanol today, what would you do differently?
  • 3. Take out your investigating water properties handout.
do now2
Do Now
  • What is chemical formula for water?
  • What does a water molecule look like? Draw one.
  • List one property of water from the reading that makes it unique.
objectives
Objectives
  • SWBAT identify unique properties of water by performing a water activity and then discussing the results
  • SWBAT define properties of adhesion, cohesion, polar, nonpolar, and hydrophobic/hydrophillic of water and relate it water activity
water activity
Water Activity
  • How many drops of water can you place on the surface of a penny?
  • How many drops of isopropanolcan you place on the surface of a penny?
  • Use the handout and create a data table and drawing of the penny.
what does water look like
What does Water Look like?
  • Let’s draw it!
  • Atom:
  • Molecule:
  • Polar:
water video
Water Video
  • We can use the properties of water to explain why the large number of drops can be placed on the surface.
  • https://www.youtube.com/watch?v=aVmU3CLxvgU
do now3
DO Now
  • Explain why the penny makes a dome shape of water in the “drops on a penny” activity.
  • Explain why a drop of isopropanol causes the dome of water to break.
objectives1
Objectives
  • SWBAT identify unique properties of water by performing a water activity and then discussing the results
  • SWBAT define properties of adhesion, cohesion, polar, nonpolar, and hydrophobic/hydrophillic of water and relate it water activity
water contains hydrogen bonds
Water contains hydrogen bonds
  • -Hydrogen bonds are weak bonds between like molecules
  • -Partial positive charge attracts a partial negative charge
what forms a drop
What forms a drop?
  • -Cohesioncauses water to form drops
  • Cohesion: attraction of water to water
  • -Surface tension causes the drops to be spherical
  • -Adhesion keeps the drops in place
  • Adhesion: attraction of water to unlike substance
surface tension
Surface Tension:
  • Water pulls in and attracts itself to form a “film” on its surface to form a drop
water drop shapes
Water Drop Shapes
  • -Water has cohesion to itself and forms a nice, round drop
  • -Round drop on wax paper (not strong adhesion to water)
  • -As adhesion to glass is stronger and pulls the water, it makes a flatter drop
water coheres to polar not nonpolar
Water coheres to polar, not nonpolar
  • -“Like adheres to Like”
  • -Polar molecules will attach to polar and nonpolar will attach to nonpolar
  • -Water (polar) has no adhesion to wax paper (nonpolar). It rolls right off.
do now4
Do Now
  • Explain how to make water not form a drop on a piece of wax. Explain what happens on the molecular level.
objectives2
Objectives
  • 1. SWBAT continue identify, explain, and apply the properties of water and how they apply to water lab using the water lab.
  • 2. SWBAT define hydrophillic, hydrophobic, capillary action, and specific heat and apply it to how water is essential to keeping organisms alive using questioning and the chapter 2 powerpoint.
  • 3. SWBAT answer questions on the properties of water using chapter 2 worksheet.
capillary action water climbs up small spaces
Capillary action: water climbs up small spaces
  • Because water has both adhesive and cohesive properties, capillary actionis present.
  • Capillary Action= water’s adhesive property is the cause of capillary action. Water is attracted to some other material and then through cohesion, other water molecules move too as a result of the original adhesion.
  • Ex: Think water in a straw
  • Ex: Water moves through trees this way
hydrophobic and hydrophilic
Hydrophobic and hydrophilic
  • -Oil is hydrophobic meaning it does not mix with water.
  • -Oil is nonpolar and has no hydrogen bonds
  • -Water is polarand hydrophilic.
  • - Remember: Like dissolves Like!

Food coloring in water

Oil in water

water is the universal solvent
Water is the Universal Solvent
  • Solute: substance that is dissolved
  • Solvent: agent that does the dissolving
  • Solution: Solute dissolved in solvent
  • Properties of water that make it an excellent solvent:
  • -water is polar and can dissolve polar and ionic molecules
specific heat of water
Specific Heat of Water
  • -Due to hydrogen bonds, water has a better ability to resist temperature change as compared to other substances
  • -Energy (Heat) must be absorbed to break hydrogen bonds
  • -Energy is released when hydrogen bonds are formed
  • Video
  • Relation to Biology:
  • -How does this relate to biology?
specific heat life
Specific Heat& Life
  • Relation to Biology:
  • -Large bodies of water have a fairly constant temperature compared to the atmosphere
  • -Keeps the water within limits to supply life!
  • -Your body is made of 66% water… homeostasis
  • -Coastal areas generally have milder climates
  • -Large water (oceans) bodies can absorb and release heat
  • -Heat is absorbed from the sun during warmer times and released
  • during cooler times to warm the air
water density
Water Density
  • -Ice is less dense than water
  • -Water vapor is less dense then water
  • Relation to Biology:
  • -If ice sank, then lakes
  • and rivers would freeze
  • -Killing the aquatic life
water pollution
Water Pollution
  • Why is water important in biology?
  • https://www.youtube.com/watch?v=fxZ4IMpM45Y
oil sheen
Oil Sheen
  • -Oil Sheen on water
  • -Oil on top of water in a thin layer
  • Pollution: How doe we get rid of it?
how to get rid of oil on water
How to get rid of oil on water
  • -Detergent breaks up oil into small drops
  • -Detergents are amphipathic
  • have both polar and
  • nonpolar regions
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