1B, Study Guide for Exam#3 - CHEMISTRY 1B Brown LeMay 12 th ed STUDY GUIDE FOR EXAM#3 In order to do well on exam#3 the student should be able to

1B, Study Guide for Exam#3 - CHEMISTRY 1B Brown LeMay 12 th...

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CHEMISTRY 1B Brown & LeMay, 12 th ed STUDY GUIDE FOR EXAM #3 In order to do well on exam #3, the student should be able to: Electrochemistry 1. Assign oxidation numbers to determine the oxidation state of an element and/or to recognize when an oxidation or reduction has taken place (a redox reaction).(Sec 4.4, 20.2) 2. Balance a redox reaction in acidic, basic or neutral solution using the half-reaction method. (Sec. 20.2) 3. Identify the cathode, anode, positive electrode, negative electrode, half-cell reactions, direction of electron flow, and direction of ion migration in a given cell.(Sec 20.3) 4. Use a table of standard reduction potentials to predict whether a given redox reaction is spontaneous and calculate the standard EMF of a cell { Ε 0 }.(Sec 20.4) 5. Use the Nernst equation to calculate the voltage of a galvanic cell or to calculate the concentration of an ion in a cell given the cell’s potential.(Sec. 20.6) 6. Predict the products that will form at the anode and the cathode when you electrolyze a solution.(Sec. 20.9) 7. Use Faraday’s law to do calculations involving mass, moles, current and time. (Sec 20.9) 8. do calculations involving the electrical units of charge, current, voltage, and power(watts). (Sec 20.9) 9. Do a calculation involving a galvanic cell and the K sp value of a solid.(Sec 20.9) 10. Answer general questions about commercial batteries. (Sec 20.7) S UGGESTED P ROBLEMS : 4.45, 4.49, 4.51, 4.53, 20.15, 20.17, 20.21, 20.23, 20.27, 20.35, 20.37, 20.41, 20.43 AND 20.44( use your potential table for 20.43 AND 20.44), 20.65, 20.67, 20.69, 20.91, 20.93, 20.100 & SA-E and Experiments 8 and 9. Thermochemistry 1. Know the definition of system, surrounding, and universe and use the first law of thermodynamics to determine Δ E ( Δ E = q + w) and understand the sign conventions used for q (heat) and w (work). (Sec. 5.1, 5.2) 2. Understand thermochemical equations, and be able to calculate the amount of heat given off or the amount of chemical that needs to be burned to supply a certain amount of energy.(Sec.5.3, 5.4) 3. Know the functions that are state functions and explain what it means to be a state function.
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