1 / 10

Notes: Water and its Special Properties

Notes: Water and its Special Properties . Chemical Formula H 2 O How many atoms? How many elements? How many molecules? How many hydrogen atoms? Oxygen? Why kind of bonds are between the hydrogen and oxygen ?. http://www.rmi.org/images/article/4Kids_H2OMolecule.gif. States of Water.

haruko
Télécharger la présentation

Notes: Water and its Special Properties

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. Notes: Water and its Special Properties Chemical Formula • H2O • How many atoms? • How many elements? • How many molecules? • How many hydrogen atoms? Oxygen? • Why kind of bonds are between the hydrogen and oxygen? http://www.rmi.org/images/article/4Kids_H2OMolecule.gif

  2. States of Water • Water is the only substance on Earth that can be found naturally in all three states of matter (solid, liquid, gas). • Liquid water is the most abundant

  3. (+) (-) (+) Special Properties: 1. Polar Molecule • Its ends have partial charges because of unequal electron sharing in covalent bonds. • It is not an ion, it doesn’t have a charge. Polar Molecule H (-) Cl O Ion H

  4. 2. Universal Solvent • Water is called the universal solvent because it has the ability to dissolve so many substances. • This is important in nature because water carries many minerals, chemicals, and nutrients through the ground and through our bodies.

  5. 3. High Heat Capacity • The ability of water to absorb or release lots of heat before its temperature will change. • Water has a VERY HIGH heat capacity. • An empty pot on the stove will heat up much more quickly than the same pot filled with water because the water in the pot will absorb the heat instead of the pot absorbing it (the metal pot has a lower heat capacity than water).

  6. 4. Cohesion • The attractive force between like molecules (ex. water molecule to water molecule). • Since water is polar, it “sticks” to other water molecules, resulting in a force between molecules which binds them together. • This force is called cohesion, or a cohesive force.

  7. 5. Adhesion • The attractive force between unlike molecules (ex. Water to toothpick). Cohesion (water sticks to water) Adhesion Water sticks to toothpick

  8. 6. Surface Tension • The formation of an elastic “sticky skin” on the surface of water due to the cohesive forces between water molecules, which is due to the polarity of water. • Water has high surface tension. • This is demonstrated as a drop of water falls from a spout. • The drop clings to the tap, stretches, and finally lets go Video Clip: Basilisk Lizard

  9. Other examples of Surface Tension

  10. Activities: • See how many drops of water you can fit on a penny. • What property of water allows you to fit so much on the penny? • Now see how many drops of soapy water you can fit on a penny.

More Related