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Ted and Bill's Adventures: Oxidation Reduction

Join Ted and Bill as they review the concepts of oxidation and reduction in chemistry. Learn about oxidation numbers and the difference between oxidation and reduction. Follow their examples and understand the charges of various elements. Get ready for an exciting journey through chemistry!

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Ted and Bill's Adventures: Oxidation Reduction

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  1. Ted and Bill’s Adventures Oxidation Reduction

  2. Bill, did you understand that stuff we learned in chemistry?

  3. Of course…did you?

  4. YEAH! I was just making sure you didn’t need me to help you

  5. Let’s review and make sure…

  6. What’s an Oxidation # ?

  7. Isn’t that the same thing as a charge?

  8. Exactly! Let’s try a few…

  9. Oxygen

  10. Oxygen -2 Sodium

  11. Oxygen -2 Sodium +1 Nitrogen

  12. Oxygen -2 Sodium +1 Nitrogen

  13. Yes, typically Nitrogen is -3, but it can have multiple charges, look at your periodic table. The actual charge depends on what other elements Nitrogen is bonded with. Nitrogen -3

  14. So how do you know which charge to use?

  15. Nitrogen -3 Let’s look at an example

  16. Sodium Nitrate NaNO3 Na = ?

  17. + 1

  18. Sodium Nitrate NaNO3 Na = +1 N = ?

  19. It has multiple charges…

  20. Good, we’ll come back to that one Sod NaNO3 Na = +1 N = ?

  21. Sodium Nitrate NaNO3 Na = +1 N = ? O = ?

  22. Oxygen is always a -2

  23. Sodium Nitrate NaNO3 Na = +1 N = ? O = -2

  24. Sodium Nitrate NaNO3 Na = +1 N = ? O = -2 Now back to the Nitrogen

  25. NaNO3 +1 ? What’s the charge of all three oxygens?

  26. If one oxygen is -2 Then, THREE oxygens will be -6

  27. NaNO3 +1 -6 Good!

  28. NaNO3 +1 -6 What does the charge of N have to be for the whole compound to have a charge of zero?

  29. (+1) + (___) + (-6) = 0

  30. (+1) + ( +5) + (-6) = 0

  31. Nitrogen has a charge of + 5

  32. NaNO3 +1 +5 -6

  33. Great! Now that you understand oxidation Numbers, do you know the difference between OXIDATION and REDUCTION?

  34. I remember something about OIL RIG

  35. Oxidation is Loss Reduction is Gain

  36. Oxidation is the LOSS of electrons….

  37. And since electrons are negative, if you LOSE an electron, then your Charge is going to INCREASE

  38. Reduction is the GAIN of electrons….

  39. And since electrons are negative, if you GAIN an electron, then your Charge is going to DECREASE

  40. Let’s try an example!

  41. Ca + H2O  CaO + H2

  42. When an element is by itself it has a charge of zero.

  43. Ca + H2O  CaO + H2 0 0

  44. Oxygen has a charge of -2

  45. Ca + H2O  CaO + H2 0 -2 -2 0

  46. The Hydrogen bonded to the oxygen has a charge of +1

  47. Ca + H2O  CaO + H2 0 +1 -2 -2 0

  48. Calcium bonded with the oxygen has a charge of +2

  49. Ca + H2O  CaO + H2 0 +1 -2 +2 -2 0

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