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UCD / Chemistry / CHEM 2 / How many electrons are transferred in redox reaction?

How many electrons are transferred in redox reaction?

How many electrons are transferred in redox reaction?

Description

School: University of California - Davis
Department: Chemistry
Course: General Chemistry
Professor: Ng
Term: Spring 2016
Tags: CHE2C, General Chemistry, and ucdavis
Cost: 50
Name: CHE 2C Midterm 1 Study Guide
Description: For this study guide, I have uploaded a collection of all of my notes from the beginning of the quarter.
Uploaded: 04/17/2016
24 Pages 48 Views 1 Unlocks
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CHEMISTRY: If you want to learn more check out Does whistleblowing need justification?

We also discuss several other topics like What is a population in statistics?

ELECTROCHEMISTRY

  • Redox rxns transfer electrons
  • Electrochem: converting chemical potential into electrical potential
  • Each ½ rxn is considered to be a ½ cell

                - ox ½ rxn + red ½ rxn = electrochemical cellIf you want to learn more check out What does second-degree murder mean?
We also discuss several other topics like What is the difference between the embodied emotion in the body against the brain?

Galvanic / Voltaic: Spontaneous E-Cells

If you want to learn more check out How do you compare two means?

  • Wire is connected to ½ cells so e- can transfer
  • “Reduction” is on the right
  • Salt bridge prevents charge build up
  • Typical reduction rxn :
  • Typical oxidation rxn:
  • Most common salt bridge is KNO3

We also discuss several other topics like What is the content of james-lange theory?

Electromotive Force (EMF): Voltage (V) that is passed in an e-cell (e⁰ cell) - cell potential

+e⁰cell: Spontaneous rxn

-e⁰cell: Non spontaneous rxn

Gases are shown bubbled in or out of the breaker:

  • In (if gas is reactant)
  • Out (if gas is product)

Inert electrode: Used whenever a metal (s) is not involved in the actual rxn (carbon, graphite, or platinum)

Ex: Draw the cell diagram for :

Line Notation:

 Figure:

Problem of the day: 

  1. Balance  Au⁺(aq) ➡ Au³⁺ (aq) + Au (s)
  2. Draw cell diagram
  3. Give line notation for cell

Figure:

  • Each ½ rxn or ½ cell, by itself , does nothing
  • Reference potential E⁰ red = O for 2H⁺ (aq) + 2e ⁻➡ H2(g)

Example: Calculate the E⁰ cell for the spontaneous rxn between Zn(s) and Na

  • Since it is E⁰, the substances are 1M and 25⁰C

Another problem example:

 

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