CHEM 107 Lecture Notes - Lecture 41: Galvanic Cell, Ionic Compound, Chemical Equation

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28 Mar 2017
School
Department
Course
3-22-17-Review for Exam
Wednesday, March 22, 2017
11:01 AM
Exam 3 on Monday
Find on Canvas
-exam review checklist
-exam 3 useful information
-list of common strong acids and bases under useful handouts
-additional practice problems will be posted today
***NO molarity questions on exam
Review for Exam-Part 1
Predict the products of each reaction, balance the equation, and determine which type of
reaction it is (precipitation, redox, acid-base, or gas evolution)
Type of Reaction
Na2S(aq) + Cu(NO3)2 → NaNO3(aq) + CuS(s) Precipitation
HCl (aq) + K2CO3 (aq) → KCl(aq) + CO2 (g) + H2O Gas evolution
Li2CO3 (aq) + CoCl2 (aq) → 2LiCl (aq) + CoCO3(s) Precipitation
HClO4 (aq) + KOH (aq) → KClO4(aq) + H2O(l) Acid-base
K(s) + LiCl (aq) → KCl(aq) + Li(s) Redox
If the galvanic cell is constructed with a Mn/Mn2+ electrode and a Cr/Cr3+ electrode,
determine which electrode will be the cathode and which electrode will be the anode
Write each half-cell reaction and the overall cell reaction
Oxidation
3Mn (s)→ 3Mn2+ + 6e-
Reduction
2Cr3+ + 6e- → 2Cr(s)
Overall
3Mn(s) + 2Cr3+ →3Mn2+ + 2Cr(s)
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Document Summary

List of common strong acids and bases under useful handouts. Predict the products of each reaction, balance the equation, and determine which type of reaction it is (precipitation, redox, acid-base, or gas evolution) Hcl (aq) + k2co3 (aq) kcl(aq) + co2 (g) + h2o gas evolution. Li2co3 (aq) + cocl2 (aq) 2licl (aq) + coco3(s) Hclo4 (aq) + koh (aq) kclo4(aq) + h2o(l) K(s) + licl (aq) kcl(aq) + li(s) If the galvanic cell is constructed with a mn/mn2+ electrode and a cr/cr3+ electrode, determine which electrode will be the cathode and which electrode will be the anode. Write each half-cell reaction and the overall cell reaction. Write a net ionic equation for this reaction. H2so4 (aq) + 2naoh (aq) na2so4 (aq) + 2h2o (l) 2- (aq) + 2na+ (aq) + 2oh- (aq) 2na+ (aq) + so4. 2h+ (aq) + 2oh- (aq) 2h2o (l) H+ (aq) + oh- (aq) h2o (l)

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