1 / 16

The Chemistry of Water

The Chemistry of Water. “When the well’s dry, we know the worth of water” --Benjamin Franklin. Water’s polarity results in hydrogen bonding. Water is a polar molecule. The charge of the water molecules results in hydrogen bonds. Properties: Hydrogen bonding results in….

fay-hart
Télécharger la présentation

The Chemistry of 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. The Chemistry of Water

  2. “When the well’s dry, we know the worth of water”--Benjamin Franklin

  3. Water’s polarity results in hydrogen bonding • Water is a polar molecule

  4. The charge of the water molecules results in hydrogen bonds

  5. Properties: Hydrogen bonding results in… • Cohesion—__________________ • Adhesion—__________________________________________________________ Both responsible for capillary action. • Surface __________________________________________________________

  6. Which properties apply here?

  7. Property: Water has a high specific heat • Specific heat—amount of energy to cause 1 g of a substance to change its temperature by 1º C. • Water’s specific heat is __________________ • The reason water’s specific heat is high is because a __________________________________________________________

  8. Water has a high specific heat • Areas surrounded by water have moderate temperatures—the water absorbs the heat—without raising the temperature of the water. • At night the loss of the heat by water warms the air. • The result—the water itself and the surrounding land have a constant temperature

  9. Property: Water results in evaporative cooling • Heat of _______________________________________________________________________________________ • This helps moderate earth’s climate • As a liquid evaporates, the surface of the liquid that remains behind cools down. This is ________________________________.

  10. How does evaporative cooling result in • Stability of temperature in lakes and ponds? • A mechanism that prevents terrestrial organisms from overheating?

  11. Property: Water has a high freezing point and lower density as a solid than a liquid. • Water is at its densest at 4º C. From ____________________________________________________ • Subsequently, ice floats. • How is this an advantage for aquatic organisms?

  12. Ice floats…

  13. Property: Water is the solvent for life • Reactions in cells take place in solution • Solution-____________________________________________________ • Water dissolves more substances than any other solvent

  14. Water is the universal solvent!

  15. Water is the solvent for life • Because of water’s polarity, all ionic compounds, and polar covalent compounds (such as sugar) will dissolve in water • __________________—a substance that has an affinity (love) for water (sugar) • _________________—a substance that repels water (lipids)

  16. Practice Free Response Water is a critical compound for the continuity of life. 70% of the Earth’s surface is covered with water that is home to thousands of species. 70% – 90% of a cell’s (organism’s) mass is water. • A. Discuss the chemical and molecular structure of the water molecule that uniquely enables it to support life on this planet. • B. Describe three different contributions that water makes to life on Earth. Explain how each contribution is related to the chemical structure of water.

More Related