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Chapter 21: Electrochemistry

Table of Contents. Chapter 21: Electrochemistry. 21.2 – Types of Batteries. 21.3 – Electrolysis. In class we will cover only what you need to know for the test . Please use your book to answer questions for WebAssign. Electrochemistry: Basic Concepts. 21.2: Batteries. Alessandro Volta:

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Chapter 21: Electrochemistry

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  1. Table of Contents Chapter 21: Electrochemistry 21.2 – Types of Batteries 21.3 – Electrolysis In class we will cover only what you need to know for the test. Please use your book to answer questions for WebAssign.

  2. Electrochemistry: Basic Concepts 21.2: Batteries • Alessandro Volta: • If one cell generates a current, several cells should make a larger current • He piled several cells together to make the first battery • Batteries: one or more electrochemical cells in a single package

  3. Electrochemistry: Basic Concepts 21.3: Electrolysis • Electrolysis: using electric energy to cause a chemical reaction. • Electrolytic cell: An electrochemical cell in which electrolysis occurs. • Electrolysis forces a current in the reverse direction (a nonspontaneous reaction) by passing an electric current through it (recharging)

  4. Electrochemistry: Basic Concepts Voltaic Cell Electrolytic Cell Voltage source e- e- e- e- An electrolytic cell is just the opposite of a voltaic cell

  5. Electrochemistry: Basic Concepts Electroplating • Reduction of silver ions onto cheaper metals forms silverplate. Click box to view movie clip.

  6. Practice problems • Finish Ch 21 Practice Problems (due at the end of class) • Begin WebAssign (due Monday, 11 pm) • You will need your book (21.2 & 21.3) for some questions on WebAssign. Now is a great time to look those up. • Review for test is Monday! • Test on Ch 10, 20, 21 is Tuesday!

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