1 / 12

Properties of Water

Learn about the composition and polarity of water, how it acts as an effective solvent, the significance of hydrogen bonding, cohesion, adhesion, and its high heat capacity. Discover why water is essential for life.

claretta
Download Presentation

Properties 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. Properties of Water Friday, January 3, 2020

  2. Composition of Water • Each molecule of water contains 2 hydrogen atoms and 1 oxygen atom (H2O). • The hydrogen atoms both attach to one side of the oxygen atom, so a molecule of water has a very familiar shape…

  3. 1. Composition of Water • Because of its shape, water is often called the “Mickey Mouse molecule”. H H O

  4. Polarity of Water • Water is formed by covalent bonds. • The hydrogen atoms each need an additional electron to have two valence electrons. • The oxygen atom needs two electrons to have eight valence electrons. • If they share, then all of the atoms are stable. H (1 valence) H (1 valence) O (6 valence)

  5. Polarity of Water • Because of oxygen’s larger nucleus, it holds the electrons (-) closer to it. • This makes one end of a water molecule have a positive charge and the other end have a negative charge. • This is known as a polar molecule. Positive H+ H+ O- Negative

  6. Effective Solvent • A solvent is a liquid that can dissolve other substances. • Because it is a polar molecule, water is able to dissolve many substances such as salts, sugars, alcohols, acids, and so on.

  7. Hydrogen Bonding • Because they are polar, water molecules cling to each other. • The hydrogen atom of one water molecule is attracted to the negative region of another, forming hydrogen bonds. • These bonds are weak, but do allow water to do some pretty amazing things…

  8. Cohesion • Cohesion is where molecules of the same kind cling together. • Cohesive forces between water molecules make it seem as if there is a “skin” at the top.

  9. Adhesion • Adhesion is the attractive force between unlike substances. • Because of adhesion and cohesion, water can actually climb up against gravity in narrow tubes such as the stem of a plant or the fibers of a paper towel. • This movement is called capillary action.

  10. Heat Capacity • It takes a tremendous amount of energy to change the temperature of water. • It takes 10 times as much energy to raise the temperature of water as it does iron. • Water will also hold on to its heat for a long time- it cools off slowwwwly.

  11. Heat Capacity • Water’s high heat capacity means that organisms can maintain homeostasis easier. • The water in their bodies resists changing temperature as the outside rises/lowers. • This helps keep their bodies’ temperature more stable.

More Related