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Aim: How do chemists write “half- reactions” ?

Aim: How do chemists write “half- reactions” ?. Each atom has a nucleus, with an overall positive charge, surrounded by negatively charged electrons. Each electron in an atom has its own distinct amount of energy.

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Aim: How do chemists write “half- reactions” ?

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  1. Aim: How do chemists write “half- reactions”? Each atom has a nucleus, with an overall positive charge, surrounded by negatively charged electrons. Each electron in an atom has its own distinct amount of energy. An oxidation-reduction (redox) reaction involves the transfer of electrons (e-).

  2. Aim: How do chemists analyze reduction-oxidation reactions? • Reduction is the gain of electrons. • Oxidation is the loss of electrons. • Oxidation numbers (states) can be assigned to atoms and ions. Changes in oxidation numbers indicate that oxidation and reduction have occurred.

  3. Aim: How do chemists analyze reduction-oxidation reactions? • In all chemical reactions there is a conservation of mass, energy, and charge. • In a redox reaction the number of electrons lost is equal to the number of electrons gained.

  4. Aim: How do chemists analyze reduction-oxidation reactions? Essential Questions: • Why is it only electrons that are transferred in chemical reactions? • How does one assign oxidation numbers? • How do chemists determine which elements are oxidized and which elements are reduced in a “redox” reaction? • Why does reduction and oxidation always occur simultaneously? • Draw an electron dot diagram depicting a redox reaction.

  5. Aim: How do chemists analyze reduction-oxidation reactions? • Distinguish between Cu0 and Cu2+ in terms of appearance in their natural state. • Propose a method to protect iron structures like the Golden Gate Bridge in San Francisco from oxidation. • Your friend believes the Statue of Liberty is painted green. Use scientific evidence to support your argument that the Statue of Liberty is NOT painted green. • Predict what would happen if copper ore, which is copper(II)oxide, is heated in the presence of charcoal (carbon.)

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