Presentation is loading. Please wait.

Presentation is loading. Please wait.

Chapter 3: Water Waters Polarity Cohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water molecules pH T.O.D: (table.

Similar presentations


Presentation on theme: "Chapter 3: Water Waters Polarity Cohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water molecules pH T.O.D: (table."— Presentation transcript:

1

2 Chapter 3: Water Waters Polarity Cohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water molecules pH T.O.D: (table from old study guide) take home essay?

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

4

5 Waters polarity and hydrogen bonds Waters polarity and hydrogen bonds Account for its unique properties that contribute to the fitness of Earths as an environment for life. Account for its unique properties that contribute to the fitness of Earths as an environment for life.

6 Cohesion/Adhesion Cohesion is waters attraction to water Cohesion is waters attraction to water Adhesion is waters attraction to other substances Adhesion is waters attraction to other substances Surface tension Surface tension Water transport in plants, up ___ tubes Water transport in plants, up ___ tubes

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

8 Expansion upon freezing Because of Hydrogen bonding … Because of Hydrogen bonding … 0° C Ice is less dense than liquid water 0° C Ice is less dense than liquid water When is water most dense? When is water most dense? If this didnt happen, bodies of water would freeze solid If this didnt happen, bodies of water would freeze solid

9 Structure of Ice vs liquid water

10 Versatile Solvent: Ex: Salt and water Ex: Salt and water Ionic and polar com- pounds dissolve in water Ionic and polar com- pounds dissolve in water

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

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

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

14 Ch.1-4 Quiz study tips: Practice questions at the end of the chapters Practice questions at the end of the chapters The tests CD ROM demonstrations and practice questions The tests CD ROM demonstrations and practice questions Study your HW notes and class notes Study your HW notes and class notes

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

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

17

18


Download ppt "Chapter 3: Water Waters Polarity Cohesion, moderation of temperature, ice is less dense, universal solvent Dissociation of water molecules pH T.O.D: (table."

Similar presentations


Ads by Google