1. Do Now G In groups of 3-4 log onto DHMO.org G Look over the site and read Editorial: Truth about DHMO (5 minutes) G Answer these questions: G What is DHMO? G Is it a good or bad thing? G Should we do anything about it? G In groups of 3-4 log onto DHMO.org G Look over the site and read Editorial: Truth about DHMO (5 minutes) G Answer these questions: G What is DHMO? G Is it a good or bad thing? G Should we do anything about it?

2. Mixtures G Material of 2 or more compounds or elements that retain their unique properties. G They can be easily separated G Examples G Salt and Pepper G Saltwater ( salt and water) G Air G Material of 2 or more compounds or elements that retain their unique properties. G They can be easily separated G Examples G Salt and Pepper G Saltwater ( salt and water) G Air

3. Solutions G When one substance is dissolved evenly in another. G Examples G Sugar water G Soda G blood G When one substance is dissolved evenly in another. G Examples G Sugar water G Soda G blood

4. Solute and Solvent G A solute is dissolved in a solvent G A solvent dissolves a solute G Can be liquids, solids or gases G A solute is dissolved in a solvent G A solvent dissolves a solute G Can be liquids, solids or gases

5. Suspensions G Materials that do not dissolve are suspended G Separate over time G Examples G Muddy water G Paint G Blood G Materials that do not dissolve are suspended G Separate over time G Examples G Muddy water G Paint G Blood

6. Water is the reason life exists on earth as it is.

7. Polarity! G A water molecule has 10 electrons G The Oxygen pulls on the electrons more because it has more Protons G The molecule bends to compensate for the pull G As a result the Oxygen atom has a slight negative charge and the hydrogen’s have a slight positive charge. G Like a magnet water has a north and south pole G These poles are attracted to opposite charges G A water molecule has 10 electrons G The Oxygen pulls on the electrons more because it has more Protons G The molecule bends to compensate for the pull G As a result the Oxygen atom has a slight negative charge and the hydrogen’s have a slight positive charge. G Like a magnet water has a north and south pole G These poles are attracted to opposite charges

9. Waters’ Special Properties G Hydrogen bonds G Cohesion – attraction to other water molecules G Adhesion – attraction to other substances G Hydrogen bonds G Cohesion – attraction to other water molecules G Adhesion – attraction to other substances

10. Expands when Frozen Reason life can exist on earth in the oceans IceWater

12. Closure… G If I pour 2 tbsp sugar into a cup of water and stir, have I just created a mixture, solution or suspension? G Is milk a mixture, solution or suspension? G What do I mean when I say that water is a polar molecule? G If I pour 2 tbsp sugar into a cup of water and stir, have I just created a mixture, solution or suspension? G Is milk a mixture, solution or suspension? G What do I mean when I say that water is a polar molecule?

13. Homework G Read the rest of 2-2 in textbook about water and pH (pages 40-43) and take notes G Remember to focus on the concepts you don’t understand so you can discuss them. G Read the rest of 2-2 in textbook about water and pH (pages 40-43) and take notes G Remember to focus on the concepts you don’t understand so you can discuss them.