CHM 121L QUIZ 6 - Name CHM l2ll Fall 20 1 Quiz#6 Molar...

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Unformatted text preview: Name: CHM l2ll. , ,, ,. / Fall 20! 1 Quiz #6 Molar Masses (g/mol): Cu = 63.55 Assume that in last week's lab you formed 0 763 g of copper from the 1": C0 ml- 1‘ (6 pts) I copper sulfate solution. What is the molarity of your solution” Slim- work. ‘3.»“01230’ ‘ No\ b_ ' Vb H U '- mml w.-.\ t}. a. .w. n“- t_-.’;_.\ » 1 ; / _' ' ar‘ :3 ( ' . L— ‘_“ \ \ (rfitrJ -'r-‘. n\_ ,1; '. 2. (6 pts) Briefly describe the following terms I i. Redox reaction rgduqmn “first; D. d c ,qcfl g, ii. Reduction MW. aunt co Hwy, am ~ ”7/ iii. Oxidation \ 1 3 {\Ldtcn ~1an (Jr nub 3. (4 pts) Use the equation below to identify the oxidized and reduced species 2 91(5) + 3 Nic'zum —* 2 CrClth) + 3 El“) 2/ Oxidized species (.t ' pm (,mmm . w Reduced specnes Ht" - N\C¥c\ 4. (2 pts) What precautions are given about the sodium sulfide, N325, solution you are going to use in today’s experiment? g/r—K 5. (6 pts) Complete and balance the following single displacement reaction equations. '\ i. 1 "i‘ (aq) -—-§ 101‘ ’x‘ ' IR? A AX x1; " w 0 I “ ii- 2 Mlle) +_‘__N32C03 (sq) "’ “Q renown j/ r P/ iii. \ Mg(s)+ 7. SnClmq) —* V~A(3Q\ “(D ,. ,' 6. (6 pts) Describe what you will see in today’s experiment when the salts in the test tubes are: i. Soluble Uin go \J'hofl \ \ L nu \\\'\\L % Mr no c.0\0\r ii. Insoluble sham“ iii. Slightly soluble kw Metal Oxidation Reaction thlum Li —> U" + e- Cosiurn C5 "" CS‘ 4’ 8' Rubidium Rb -* Rb‘ 4’ 9‘ Potassium K —+ K‘ + e- Ban'um 83 —> Ba2+ + 2&- Stromium Sr —» Srz' + Ze- Calcium Ca —> Ca2‘ + 28- Sodium m Na —> Na+ + 0- Magnesium § Mg—> M92” + 29- Aluminum 05 Al -+ Al3‘ + 3e- Manganese Mn—b Mna“ + Ze- Zinc 3' Zn -> Zn“ + 2e— Chromium 9,. Cr —> Cr9+ + 3&— lron E Fe -—f Fe2* + 2e— Cadmium g Cd -> Cdz‘ + 2e- Cobalt g Co -+ 002' 4- 2e- Nickel § Ni —» Ni2+ + 2e- Tun Sn -> Sn?+ + 2e- Lead Pb -—> Pt)?“ 4- 2&- Hydrogen H2 -> 2H‘ + 2% Copper Cu —» Cuz‘ + 2e— Silver Ag —> Ag" + e- Mercury Hg —r Hg“ 4: Ee- Platinum Pt -> PF" + 2e- Gold Table I. Activity Senes ofMemls. Au -b Au3+ + Be- ...
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