How are oxidation and reduction related to changes in oxidation #? Oxidation is an increase in oxidation number, reduction is a decrease in oxidation number. In the reaction H2+ Cl2→2HCl which element is oxidized, which is reduced? 0 0 +1 –1 H2+ Cl2→2HCl H is oxidized (increase in oxidation number) Cl is reduced (decrease in oxidation number) See class handout for example of balancing equations using oxidation numbers (or see pg. 451-3) 17.1, 17.2 Define electrochemistry. The study of chemical changes that are caused by or that produce electricity. What must a solution that conducts electricity contain? Ions. For example, NaCl will conduct electricity when in water or when melted because, in these conditions, Na+and Cl–come apart. However, solid NaCl cannot conduct electricity. What are the two types of electrochemical systems/cells called? How are they different? Electrolytic and Galvanic. The chemicals in electrolytic cells are forced to react by passing a current through them. The chemicals
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