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Water & Life. Chapter 3. H2O is why we are here. H 2 O molecules are polar What does their polarity contribute to? Each H 2 O molecule can form __ Hydrogen bonds?. Cohesion & Adhesion. Caused by Hydrogen bonding Cohesion – Water-to-water Adhesion – Water-to-something other than water

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water life

Water & Life

Chapter 3

h2o is why we are here
H2O is why we are here
  • H2O molecules are polar
      • What does their polarity contribute to?
  • Each H2O molecule can form __ Hydrogen bonds?
cohesion adhesion
Cohesion & Adhesion
  • Caused by Hydrogen bonding
  • Cohesion – Water-to-water
  • Adhesion – Water-to-something other than water
  • When water travels upward in a straw, is that cohesion or adhesion? Why?
  • Diameter of straw: small or large? Why?
structure function in water transport
Structure & Function in Water Transport
  • What structural feature of water enables it to be transported upward?
  • What structural feature of plant vessels enables water to be transported upward?
properties of water
Properties of Water
  • 1. High Surface Tension
  • 2. Temperature Moderation
  • 3. Evaporative Cooling
  • 4. Significant Solvency
surface tension
Surface Tension
  • Surface Tension – water can stand above the rim of a glass due to hydrogen bonds
      • Is surface tension a result of cohesion or adhesion?
      • Why?
temperature moderation
Temperature Moderation

Temperature – measure of average kinetic energy of molecules

-- Water does this because it has a high specific heat

 Water can absorb large amounts of heat but change little in temperature

 Guess what type of bonding is responsible for high specific

sea breeze cranberry juice
Sea Breeze? (cranberry juice & …)
  • Day, land heats up faster (low specific heat)
      • Air over land rises
      • Onshore breeze
  • Night, lands cools faster
      • Hot air rises over water
      • Offshore breeze
evaporative cooling
Evaporative Cooling
  • Water has high specific heat due to?
  • Responsible for cooling
      • Heat is released as liquid is vaporized into gas
      • Highest energy molecules are vaporized first
      • Vaporization involves the breaking of which bonds?
water
Water
  • Which is more dense, liquid or solid H2O?
  • As temperature increases, what happens to density?
  • Why?
  • What does this mean for ocean stratification?
  • Which temperature (Celsius) is H2O the most dense?
properties of water1
Properties of Water
  • 1. There are two cities, Davie and Pompano Beach, which will have a higher temperature during summer?
    • Why can we not use Weston instead of Davie?
  • 2. What bonds are broken during evaporative cooling?
  • 3. What force is responsible for cohesion?
  • 4. What force is responsible for adhesion?
like dissolves like
Like dissolves like…
  • Water is polar so it dissolves polar substances
      • Also dissolves ionic solids (salts)
      • Polar substances = hydrophilic
          • Hydro = water -philic = to like
          • (Dendrophiliac – one who likes trees)
  • Water does not dissolve nonpolar substances
      • Nonpolar substances = hydrophobic
          • Hydro = water -phobe = to fear
          • (Triskaidekaphobe – one who fears the number 13)
remember
Remember…
  • Hydrophilic = polar molecule
      • Will dissolve in water
  • Hydrophobic = nonpolar molecule
      • Will NOT dissolve in water
  • What about ionic compounds?
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