1 / 17

Chapter 3: Water

T.O.D: (table from old study guide) take home essay?. Chapter 3: Water. Water’s Polarity Cohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water molecules pH. WATER: the stuff of life!. www.pascochamber.org/ visitorInfo.htm.

abra-collier
Download Presentation

Chapter 3: Water

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. T.O.D:(table from old study guide)take home essay? Chapter 3: Water Water’s PolarityCohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water moleculespH

  2. WATER:the stuff of life! • www.pascochamber.org/ visitorInfo.htm www.hd.org/Damon/photos/natural-science/&h=254&w=243&prev=/images

  3. Water’s polarity and hydrogen bonds • Account for its unique properties that contribute to the fitness of Earth’s as an environment for life.

  4. Cohesion/Adhesion • Cohesion is water’s attraction to water • Adhesion is water’s attraction to other substances • Surface tension • Water transport in plants, up ___ tubes

  5. Stabilize temperatures • WHY? • High specific heat • Water moderates global and organismal temperatures • Evaporative cooling is important for animals as well as plants

  6. Expansion upon freezing • Because of Hydrogen bonding … • 0° C Ice is less dense than liquid water • When is water most dense? • If this didn’t happen, bodies of water would freeze solid

  7. Structure of Ice vs liquid water

  8. VersatileSolvent: • Ex: Salt and water • Ionic and polar com-pounds dissolve in water

  9. Even very large molecules like proteins dissolve in water as long as there are areas of ionic or polar bonds.

  10. The pH scale • pH=The measure of H+ and OH- in a solution. • Scale 0-14… • Acids=increase the H+ concentration • Bases=reduce the H+ concentration

  11. pH = -log[H+] • Neutral = 10-7[H+] • Ex: pH 9 has H+ concentration of 10-9 M and an OH- concentration of 10-5 M • Practice problems… • Buffers • Acid rain

  12. Ch.1-4 Quiz study tips: • Practice questions at the end of the chapters • The test’s CD ROM demonstrations and practice questions • Study your HW notes and class notes

  13. Sources • Campbell, Reece, Mitchell. Biology, 5th Ed. 1999, Chap-ter one. Pgs. 1-21. • Campbell, Reece, Mitchell. Biology, 5th Ed. 1999, Presentations CD-ROM. • Click art CD-ROM, Broderbund.

  14. core.federated.com/ ~jim/water.jpg

More Related