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Topics for Today

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  1. Topics for Today • Am I eating an acid? • Lipids, Fats, and Oils!

  2. Topics for Today • What is the pH scale? • H+ and OH-

  3. Readings • 6.3 Neutralization • 6.4 Introducing pH

  4. Topics for Today • What is a fat? Fatty acid? • Saturated vs unsaturated fats • Animal versus plant

  5. Readings For Today • 11.3 Fat & Oils: Part of the lipid family • 11.4 Saturated and Unsaturated Fats & Oils

  6. Topics for Wednesday • What is a trans fat?

  7. Topics for Friday • “Acid” Rain • Quiz 10

  8. Topics for Today • What is the pH scale? • H+ and OH-

  9. What do we know about water? .. .. O H H

  10. What do we know about water? • 1) It’s bent .. .. O H H

  11. What do we know about water? • 1) It’s bent • 2) It’s polar δ- .. .. O H H δ+ δ+

  12. What do we know about water? • 1) It’s bent • 2) It’s polar • 3) Polar things dissolved in water δ- .. .. O H H δ+ δ+

  13. What do we know about water? • 1) It’s bent • 2) It’s polar • 3) Polar things dissolved in water • 4) Formed from acid-base reactions δ- .. .. O H H δ+ δ+

  14. Neutralization Reaction Acid + Base Salt + Water  NaNO3 + HOH HNO3 + NaOH H+ NO3- Na+ OH- Na+ NO3- H+ OH-

  15. What do we know about water? • 1) It’s bent • 2) It’s polar • 3) Polar things dissolved in water • 4) Formed from acid-base reactions • 5) Formed from making Nylon and PET δ- .. .. O H H δ+ δ+

  16. Polyester Nylon

  17. What do we know about water? • 1) It’s bent • 2) It’s polar • 3) Polar things dissolved in water • 4) Formed from acid-base reactions • 5) Formed from making Nylon and PET • 6) Anywhere from ½ to ¾ of our body What else do we know about water? δ- .. .. O H H δ+ δ+

  18. NEW!!! A VERY small amount of water will be H+ and OH- • Water forms ions! .. .. O H H

  19. = H+ = OH─

  20. .. .. + H+ OH- O H H

  21. If H+ goes up… What happens to OH-? .. .. + H+ OH- O H H It goes down!!

  22. What do the brackets mean? ALWAYS!!!! [H+] x [OH-] = 1 x 10-14 = 0.00000000000001

  23. Example Moles solute [ ] = = Molarity Liter solution [H+] x [OH-] = 1 x 10-14

  24. “Pure Water” [OH-]? 1 x 10-7 moles H+ [H+] = 1 x 10-7 M = = [OH-] Liter solution =0.0000001 M

  25. What is OH- concentration? Lemon Juice • [H+] = 1 x 10-2 M = 0.01 M • [OH-] = 1 x 10-12 M Subtract the exponents! [H+] x [OH-] = 1 x 10-14

  26. Why do we care about [H+]?

  27. The pH depends on [H+] !!

  28. For those who like math… pH = -log[H+]

  29. “Pure” Water 1 x 10-7 moles H+ [H+] = 1 x 10-7 M = Liter solution This is considered “neutral” pH = 7!

  30. Acids = High concentration of H+ Acids = Low concentration of OH-

  31. Lemon Juice • [H+] = 1 x 10-2 M • [OH-] = 1 x 10-12 M pH = 2!

  32. Bases = Low concentration of H+ Bases = High concentration of OH-

  33. Ammonia • [H+] = 1 x 10-10 M = 0.0000000001 M • [OH-] = 1 x 10-4 M = 0.0001 M pH?? 10!

  34. Increase H+ (Decrease OH-) Decrease H+ (Increase OH-)

  35. “Acid” Rain Friday!

  36. Topics for Today • What is a fat? Fatty acid? • Saturated vs unsaturated fats • Animal versus plant

  37. What is a fat?

  38. The Fat “Family Tree!” Lipids Triglycerides Other Lipids Oils Fats

  39. Full of calories (energy)! Greasy and slippery… Very nonpolar Soluble in water?

  40. Where do we find triglycerides?

  41. Fish, chicken (especially fried!)

  42. What does NOT contain fats?