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Bell Ringer

Bell Ringer. Describe water without using the word wet. Brain Pop-http://www.brainpop.com/science/earthsystem/water/. Structure of Water. Water is made up of atoms Atoms attach together, or bond to form molecules. 2 Hydrogen atoms bond to 1 Oxygen atom form a water molecule ( H 2 0).

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Bell Ringer

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  1. Bell Ringer • Describe water without using the word wet. • Brain Pop-http://www.brainpop.com/science/earthsystem/water/

  2. Structure of Water • Water is made up of atoms • Atoms attach together, or bond to form molecules. • 2 Hydrogen atoms bond to 1 Oxygen atom form a water molecule ( H20)

  3. Structure of Water • Each end of a molecule has a slight electric charge • Oxygen = slight negative charge • Hydrogen =slight positive charge • Molecule that has electrically charged areas is a polar molecule

  4. Structure of Water The positive Hydrogen ends of the water molecule attract the negative Oxygen ends of nearby water molecules. The end result, the water molecules tend to stick together because of the electric force; similar to an magnetic force

  5. 4 Key Properties of Water • Capillary Action • Surface Tension • Universal Solvent • Specific Heat

  6. Capillary Action • Combined force of attraction among water molecules and the molecules of surrounding materials • Example: drinking from a straw {pg 48} (you will see the liquid rise higher in the straw than on the outside of the straw) OR paper towel soaking up water • Water molecules are attracted to the straw, they pull other water molecules up with them

  7. Cohesion • the action or property of like molecules sticking together, having an attractive force • Water molecules are attracted to other water molecules

  8. Adhesion • the tendency of water to stick to other substances • Water can also be attracted to other materials.

  9. Surface Tension • Surface tension causes raindrops to form round beads when they hit a car windshield • The tightness across the surface of water that is caused by the polar molecules pulling on one another. • The tightness of the water keeps the bug from sinking • The pulling forces the surface of the water into a curved shape

  10. Universal Solvent • Solution is a mixture that forms when one substance dissolves another • Solvent – the substance that does the dissolving. • Many substances dissolve in water because water is polar. (like the powdered Kool-Aid) • Water is a universal solvent because it dissolves almost everything

  11. Specific Heat • Is the amount of heat needed to increase the temperature of a certain mass of substance by 1 degree C. • Water requires a lot of heat to increase its temperature • Water’s high specific heat is due to the strong attraction among water molecules

  12. Changing State • Water is the only substance on Earth that commonly exists in all 3 states of matter • Solid- ice cube • Liquid- water in a lake • Gas- water vapor (humidity)

  13. Changing State- Evaporation • the process by which molecules at the surface of a liquid absorb enough energy to change into a gaseous state • Water boils at 100o C and a change of state occurs • Molecules get enough energy to escape the liquid and become invisible water vapor (gas)

  14. Changing State-Condensation • As water cools down, it releases some of its energy to the surroundings • Molecules slow down and temperature decreases • Condensation- process in which a gas changes to a liquid • The sweat you see on the outside of a glass

  15. Changing State- Freezing • Liquid water freezes at 0o C • Molecules lose energy and move more slowly • An icicle forming from water dripping off a roof

  16. Changing State-Melting • As the temperature reaches above 0o C the solid ice melts and becomes a liquid.

  17. Summary • At the end of your notes write an eight sentence summary paragraph about your notes and turn into basket

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