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Chem Catalyst

Chem Catalyst. How is an ion formed?. Today’s Agenda:. Do Now Intro: New Chapter Notes- Oxidation & Reduction Practice Worksheet. New Topic: Electrochemistry. Chapter 20 (and some Chapter 21) Oxidation and Reduction Writing Redox Reactions Voltaic cells/batteries.

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Chem Catalyst

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  1. Chem Catalyst How is an ion formed?

  2. Today’s Agenda: • Do Now • Intro: New Chapter • Notes- Oxidation & Reduction • Practice Worksheet

  3. New Topic: Electrochemistry Chapter 20 (and some Chapter 21) • Oxidation and Reduction • Writing Redox Reactions • Voltaic cells/batteries

  4. Oxidation Reactions • Originally defined as combining the element with oxygen • Now defined as loss of electrons (shift of electrons away from an atom) • Charge becomes more positive (increases)

  5. Reduction Reactions • Originally defined as removing oxygen from a compound with the element • Now defined as gain of electrons (shift of electrons toward an atom) • Charge becomes more negative (charge decreases) • Occurs alongside an oxidation reaction

  6. Redox Reactions • A reaction that includes oxidation and reduction • The substance that gains electrons is reduced • The substance that loses electrons is oxidized • “LEO the lion goes GER” • Losing Electrons is Oxidation; Gaining Electrons is Reduction

  7. Redox Reactions: Practice Identify the element being reduced and the element being oxidized: Hint: break apart the ionic compounds 2AgNO3 + Cu  Cu(NO3)2 + 2Ag *Identify the oxidizing agent and the reducing agent

  8. Redox Reactions: Practice Identify the element being reduced and the element being oxidized: 2Na + Br2 2NaBr

  9. Applications of Redox: • Some metals (gold, platinum) are not easily oxidized • Iron is oxidized by oxygen, causing corrosion • Can be coated w/ aluminum, whose oxide does not corrode • Connect to an easily oxidized metal (zinc, magnesium) which will transfer electrons to iron

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