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Honors Chemistry Unit 6 – Chemical Equations

Honors Chemistry Unit 6 – Chemical Equations. Lesson 5 – Predicting Products II: Single Replacement Book Section: 8-3 Objective: SWBAT predict products for single replacement reactions Do Now: Prepare for Quiz 6-4. Agenda: Quiz, Lesson, Practice, HW. Oxidation and Reduction.

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Honors Chemistry Unit 6 – Chemical Equations

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  1. Honors ChemistryUnit 6 – Chemical Equations Lesson 5 – Predicting Products II: Single Replacement Book Section: 8-3 Objective: SWBAT predict products for single replacement reactions Do Now: Prepare for Quiz 6-4. Agenda: Quiz, Lesson, Practice, HW

  2. Oxidation and Reduction • Single replacement reactions are driven by oxidation and reduction. • Oxidation is the loss of electrons • Reduction is the gain of electrons

  3. Oxidation-Reduction • Example: • AgNO3 + Cu  Cu(NO3)2 + Ag • Silver on left: +1 Silver on right: 0 • Copper on left: 0 Copper on right: +2 • Silver is reduced from +1 to 0 • Copper is known as the reducing agent • Copper is oxidized from 0 to +2 • Silver nitrate is the oxidizing agent • Single replacement reactions are also known as redox reactions as a result.

  4. Predicting Single Replacement • So, this reaction happens: • AgNO3 + Cu  Cu(NO3)2 + Ag • What about the reverse reaction? • Cu(NO3)2 + Ag  AgNO3 + Cu • Hopefully logic would tell you that the reverse reaction is not spontaneous. • We would have to force it to happen using electricity. • So, how do we know which redox reactions will happen and which ones won’t?

  5. Activity Series • This chart tells you how active a metal or halogen is, or how able it is to displace another metal or halogen in a single replacement reaction.

  6. Activity Series • Compare the two metals or halogens involved in the reaction. • The metal or halogen that is higher on the activity series will be paired with the ion.

  7. Activity Series • Take our previous example: • AgNO3 + Cu  • Copper is higher than silver, so copper can displace silver. • AgNO3 + Cu  Cu(NO3)2 + Ag • Because copper is higher than silver, the reverse reaction will not occur.

  8. Practice • Zn + HCl 

  9. Practice • Zn + HCl  ZnCl2 + H2

  10. Practice • Au + HCl 

  11. Practice • Au + HCl  no reaction

  12. HW 6-4: #102-113 • Next week: • Friday: Quiz 6-5, Predicting Products III – Double Replacement (8-3)

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