Water life
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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

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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?


    Water life

    Transpiration (Plants)


    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?


    Hydrogen bonding is cool

    Hydrogen Bonding is cool


    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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