The Chapter 7 Homework is due on Thursday, October 29 at 11:59 pm. The Chapter 6 and 7 Test is on Friday, October 30

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Please get out your Chapter 6 Review Worksheet

Chapter 7 Oxidation and Reduction Energy transfers

Overview: Life Is Work Living cells require energy from outside sources. © 2014 Pearson Education, Inc. Cells use chemical energy stored in organic molecules to regenerate ATP, which powers work.

Figure 7.2 Light energy ECOSYSTEM Photosynthesis in chloroplasts CO 2  H 2 O Cellular respiration in mitochondria Organic molecules  O2 O2 ATP ATP powers most cellular work Heat energy

Electronegativity

Redox Reactions: Oxidation and Reduction The transfer of electrons during chemical reactions releases energy stored in organic molecules. This released energy is ultimately used to synthesize ATP. transfer electrons Chemical reactions that transfer electrons between reactants are called oxidation-reduction reactions, or redox reactions. © 2014 Pearson Education, Inc.

Oxidation In oxidation, a substance loses electrons, or is oxidized.

Reduction In reduction, a substance gains electrons, or is reduced (the amount of positive charge is reduced). © 2014 Pearson Education, Inc.

Figure 7.UN02 becomes oxidized becomes reduced The electron donor is called the reducing agent. (X) The electron acceptor is called the oxidizing agent. (Y)

The electron donor is called the reducing agent. _____ The electron acceptor is called the oxidizing agent. _____ becomes oxidized (loses electron) becomes reduced (gains electron) (Na) (Cl)

Methane (reducing agent) Oxygen (oxidizing agent) Carbon dioxide Water becomes reduced Reactants Products becomes reduced becomes oxidized Some redox reactions do not transfer electrons but change the electron sharing in covalent bonds.