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What’s redox anyways?

What’s redox anyways?. A tutor’s guide on teaching about oxidation-reduction problems By Stephanie Yan, Jennifer Zhang, and Farnaz Dayani. Background information. Key concepts understand terminology Understand general trends in oxidation states of various elements

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What’s redox anyways?

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  1. What’s redox anyways? A tutor’s guide on teaching about oxidation-reduction problems By Stephanie Yan, Jennifer Zhang, and Farnaz Dayani

  2. Background information • Key concepts • understand terminology • Understand general trends in oxidation states of various elements • understand concept of valence electrons and that valence electrons does NOT always correspond with oxidation number • Student's difficulty • Student is able to understand redox reactions with oxygen and hydrogen, but has difficulty with ones that don't only involve O2- and H+ • Student sometimes gets confused with words like "oxidation reaction, oxidized element, and oxidizing agent” • student has not yet learned to balance redox equations

  3. Visual Verbal Method • First, make sure the student understands that: • oxidation means gain of oxygen or loss of electrons • reduction invovles loss of oxygen or gain of electrons • Show a problem that includes gain or loss of oxygen • Show solution reduction: CuO gets reduced CuO+ H2 Cu + H2O(loss of “o”) gaining oxygen, SO3(2-) gets oxidized ,SO3(2-) + H2O= SO4(2-)(gain of “o”)

  4. Visual Verbal Method contd. • Show a problem that does not involves loss or gain of oxygen • Show solution EX: Zn + CuSO4= ZnSO4 + Cu Zn(0) – 2e- -------Zn2+ lose electron, gets oxidized CU2+ 2e- --------CU(0) gain electron, gets reduced, occurs reduction • In solution, include that the element that is reduced is the oxidizing agent and the element that is oxidized is the reducing agent • explain oxidation state and numbers (O is always 2-, H is usually +1, figure rest out from total compound/molecule's charge • Explain how to solve for an element’s oxidation states in absence of O2- and H+

  5. Visual Nonverbal Method • use boxes with arrows and letters up/down O(r)R(a), down/up R(r)O(a) • Love story between Mr. Orra and Ms. Rroa and flowers are e- • you cannot marry yourself/ be a husband-wife so you can't be the oxidizing agent AND be oxidized. Therefore if you are oxidized, you are the reducing agent.

  6. Auditory Method • LEO the lion says GER (can also be visual verbal) • Lose Electron = Oxidation • Gain Electron = Reduction • When you gain an electron, the charge is actually reduced because electrons are negative charge • Story telling along with previous example of love story (once upon a time, there was a guy named ORRA…………)

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