Chapter 20 Redox Worksheet Answers, Exercises of Chemical Processes

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~ os X hake IS 4 PG ES Chapter 20 Worksheet: Redox ANSWERS _ 1. Determine what is oxidized and what is reduced in each reaction. Identify the oxidizing agent and the reducing agent, also. L 2. 3. 6. 7. 9. 10. 11. 12. 13. 14. 28r + O. —+2Sr0 Sr’ to St”; oxidized/reducing agent 0" to O*: reduced/ox. ag. 2Li + S —+Li,S Li to Li”; oxidized/red. ag. S° to S*: reduced/ox. ag. 2Cs + Br,—>2CsBr C8" to Cs": oxndizedited. ae Br? to Fy reduced/ox. ag. . 3Mg + Nr» MgsN. — Mg" to Mg”: oxidized/red. ag. N° to N*; reduced/ox. ag. . 4Fe + 30.— 2Fe.03 Fe’ to Fe*; oxidized/red. ag. 0° to O'; reduced/ox. ag. Ch + 2NaBr —*2NaCl + Br. Cl° to Cl: reducediox. ag. Br" to Br®: oxidized/ted. ag. . a a0 g H : eu vel : . Si + 2F,—\» SiF, Si’ to Si": oxidis ved, ag ¥ to FU; reducediox. ag. Mg + 2HCI—*MgCh + H, Mg” to Mg”: oxidized/red. ag. H"" to H°: reduced/o.a. 2Na + 2H,0-—* 2NaOH + Hy Na’ to Na; oxidized/.a. EH" to H”: reduced/o.a. Give the oxidation number of each kind of atom or ion. a. sulfate b. Sn c. S* . d. Fe* e. Sn* f. nitrate g. ammonium 2- 8 _2- 3+ 4+ 1 1+ Calculate the oxidation number of chromium in each of the following. a. Cr03; b. Na,CrO; c. CrSO, d. chromate e. dichromate 3+ 6+ Pa Pe 6+ G+ Use the changes in oxidation numbers to determine which elements are oxidized and which are reduced in these reactions. (Note: it is not necessary to use balanced equations) a, C + H,SO,——* CO, + SO. + HO © to C: oxidized S* to Ss reduced b. HNO; + HI—*NO + I, + H,O'N™ to N*: reduced U to T°; oxidized peod ‘c. KMnO,-+ HCl1—>MnCh + Ch -+ HO + KCl) Mn" to Me? - ° oP to CP: os ed d. Sb + HNO;-—* Sb,0; + NO + H,0 $b’ to Sb*: oxidized N*" to Ns red. sed For each reaction in problem -13, identify the oxidizing agent and reducing agent. a. oxidizing agent: sulfur reducing agent: carbon b. oxidizing agent: nitrogen reducing agent: iodine reduciig agent: chlorine lizing agent; m d. oxidizing agent: nitrogen reducing agent: antimony