Unit 7: Redox & Electrochemistry What’s the point ? • Electrical production (batteries, fuel cells) REDOX reactions are important in … • Purifying metals (e.g. Al, Na, Li) • Producing gases (e.g. Cl 2 , O 2 , H 2 ) • Electroplating metals • Protecting metals from corrosion • Balancing complex chemical equations • Sensors and machines (e.g. pH meter) What is Redox? • REDOX stands for REDuction/OXidation • Oxidation is often thought of as a combination of a substance with oxygen (rusting, burning) • Just like with acid/base definitions the definition of oxidation is expanded • Oxidation refers to a loss of electrons • Reduction refers to a gain of electrons • As a mnemonic remember LEO says GER • L oss E lectrons = O xidation • G ain E lectrons = R eduction • Read 12.1 (pg. 443 - 445) Testing concepts Q- What is oxidation? What is reduction? Represent each as a chemical equation. Q- Why are 2Na+Cl
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