Today Monday 9/14/15 you will… Explain why the special properties of water make it essential for life. Predict the effect of pH You need ISN Something to write with FBI- Water Properties Bell Work Glue water FBI to the TOP of ISN page 20 Glue Water POGIL to ISN pg 21 Glue Graphing Practice to ISN pg 14 Water Concept Map= Study Guide

Reminders You have a Mini-Summative on water properties tomorrow!! Lab reports are due by the end of the day on tomorrow

Did you know?

The oxygen end has a - charge The hydrogen end has a + charge. Polarity Universal Solvent Cohesion Surface Tension Adhesion Capillary Action Density High Specific Heat

Water is an excellent Solvent Ex. Kool-aid Polarity Water is an excellent Solvent Ex. Kool-aid Universal Solvent Kool-aid Mix + Water = Oh Yeah! Cohesion Surface Tension Adhesion Capillary Action Solute + Solvent = Solution Density material added to the liquid that will dissolve (The smaller amount) Liquid that items are added to (The Larger amount) Liquid that all materials are distributed equally High Specific Heat

Water is attracted to itself Polarity Water is attracted to itself Universal Solvent + - Cohesion is the attraction of molecules of the same substance Cohesion Surface Tension Adhesion Capillary Action Density High Specific Heat

Water attraction (cohesion) forms a thin ‘skin’ barrier on surface. Polarity Cohesion at work Universal Solvent Water attraction (cohesion) forms a thin ‘skin’ barrier on surface. Cohesion Surface Tension Adhesion Capillary Action Density High Specific Heat

Attraction of water to other materials Polarity Attraction of water to other materials Universal Solvent Cohesion Surface Tension Adhesion Capillary Action Density High Specific Heat Ex. Water sticking to a glass, Water droplets on a car, water droplets on a window or wall

Adhesion and cohesion together cause Polarity Adhesion and cohesion together cause water to move against gravity Universal Solvent Cohesion Surface Tension Adhesion Capillary Action This is how water moves up plant’s stems! Density High Specific Heat

Water EXPANDS upon freezing  making it less dense so it FLOATS! Polarity Water EXPANDS upon freezing  making it less dense so it FLOATS! Universal Solvent Cohesion Surface Tension Adhesion Capillary Action Density High specific Heat

Homeostasis Water… Absorbs heat slowly Retains heat / Energy Longer Hydrogen Bond Water… Absorbs heat slowly Retains heat / Energy Longer maintains temp. of Earth maintains temp. of Organisms Homeostasis Universal Solvent Cohesion Surface Tension Adhesion Capillary Action Density High specific Heat Energy Storage

High Specific Heat: High Heat Capacity Water absorbs a lot of heat before it is affected Why do we care? HOMEOSTASIS!!!  maintaining internal stability/balance Maintains temp. of earth

Importance of Specific Heat capacity Helps in regulating temperatures in a pond: This same concept can be expanded to a world-wide scale. Oceans & lakes help regulate the temperature ranges… Water near cities, take longer to heat up & longer to cool, so cities near the oceans will tend to have less change & less extreme temps than inland Midwest states, such as Nebraska, will have colder winters & hotter summers than cities on coast! Fish stay “happy” because the heat capacity means the temp. of the pond will stay relatively the same from day to night.

Great Review of Water Properties Properties of Water Video Clip Great Review of Water Properties https://www.youtube.com/watch?v=aVmU3CLxvgU

Water Quiz - Question 1 Name The property: I washed my car yesterday. When I finished rinsing it off, it still looked wet and there were all these droplets of water stuck to my car. Even on the windshield that is sloped.

Water Quiz - Question 2 3. Water is considered ___________ because it has a positive and negative end.

Water Quiz - Question 3 4. When water is attracted to itself, like forming a droplet.

Water Quiz - Question 4 5. A solution is made of what two items

Water Quiz - Question 5 7. What property is described? I saw a bug walking across the water! He didn’t sink through, and it looked like the water bent underneath it.

Water Quiz - Question 6 8. Areas of land along a large lake or an ocean, seem cooler than other areas near them. What property of water proves this to be true?

Water Quiz - Question 7 9. What type of bonding occurs between hydrogen atoms and other types of atoms?

Water Quiz - Question 8 10. What property of water is described? I put blue food coloring in my vase of roses. 2 days later my roses turned purple!

Water FBI -Top of ISN pg 20 Complete the table checking ALL properties that apply Polarity Cohesion Adhesion High Specific Heat Solubility Density Surface Tension Water climbs on paper with tip in water Water drops mound when piled on a penny Ice floats on a pond A bug walks across your pool and a needle floats Water doesn’t mix with oil Water boils at 212F (100C) Water can travel from roots to tops of tallest tree Animals can cool themselves by sweating or panting Two water drops placed next to each other “merge” into one big drop Water dissolves polar substances, like salt Meniscus forms in measuring cup of water Warmer by the ocean at night during the winter

A small change in pH makes a HUGE difference Basic Copy pH scale onto the bottom of ISN pg 20