2 We have looked at several reactions: Fe + CuSO4 Cu + Fe2(SO4)3 Li + H2O LiOH + H2Such experiments reveal trends. The activity series ranks the relative reactivity of metals.It allows us to predict if certain chemicals will undergo single displacement reactions when mixed: metals near the top are most reactive and will displacing metals near the bottom.Q: Which of these will react?Fe + CuSO4 Ni + NaCl Li + ZnCO3 Al + CuCl2 KNaLiCaMgAlZnFeNiSnPbHCuHgAgAuNo, Ni is below NaYes, Li is above ZnYes, Al is above CuYes, Fe is above CuCu + Fe2(SO4)3NR (no reaction)Zn + Li2CO3Cu + AlCl3
3 A: No for cold, yes if it is hot/steam Mg + H2O H2 + Mg(OH)2 acid H is the only nonmetal listed. H2 may be displaced from acids or can be given off when a metal reacts with H2O (producing H2 + metal hydroxide). The reaction with H2O depends on metal reactivity & water temp.Q: will Mg react with H2O?KNaLiCaMgAlZnFeNiSnPbHCuHgAgAucold H2Ohot H2OsteamA: No for cold, yes if it is hot/steamMg + H2O H2 + Mg(OH)2acidQ: Zn + HCl H2 + ZnCl2Complete these reactions:Al + H2O(steam) Cu + H2O Ca + H2SO4 Na + H2O H2 + Al(OH)3NRH2 + CaSO4H2 + NaOH
4 Other Activity Series Information All metals will have a specific place in the activity series. For simplicity, only the most common metals are shown.The metals near the top of the activity series are more reactive because their valence electrons are more easily removed.On tests and exams the activity series may appear as K, Na, … Ag, Au; you must remember that K is reactive, Au is not.If the valence of a metal is not indicated in the question, use its most common valence (in bold on your periodic table) to determine the correct chemical formula.
5 Activity series labOn the next slide, place a check in the corner of boxes where you think reactions will take place.Get a plastic spot plate.Combine chemicals specified in the chart. Figure out a way to keep track of the chemicals. Use a ¼ scoop for solids (the less, the better). Use 1 squeeze of an eyedropper for solutions.Write chemical equations for chemicals that reacted. Write NR where there was no reaction.Dump used chemicals into the large funnel at the front of the room (use a squirt bottle to rinse remaining chemicals into the funnel). Wash the spot plate and glass rod very well. Dry & return.
7 OxidesKNaLiCaMgAlZnFeNiSnPbHCuHgAgAuThe formation and behavior of oxides can also be predicted via the activity series.Complete these reactions:Ca + O2 Au + O2 Fe2O3+ H2 Oxides form via the addition of oxygen:K + O2 K2OOxides plus H2 (with heat) will change to metal and H2O:NiO + H2 Ni + H2OheatCaOOxides decompose with heat:HgO Hg + O2NRheatheatFe + H2O
8 More practiceFor all questions write the relavant balanced chemical equation(s). Use NR to indicate if there is no reaction. If the valence of a metal is not indicated in the question, use the metal’s most common valence (indicated in bold on your periodic table) to determine the correct chemical formula.Pg. 68 #9a, 10, 11, 12, 8, 18Read 5.6 and 5.7 (pg. 61 – 64)
9 Answers a) – d), 9, 10 Mg + 2HCl MgCl2 + H2 Zn + CuCO3 ZnCO3 + Cu Ag + H2SO4 NRCuO + H2 H2O + Cu9a) Yes: 2Cr + 6HCl 2CrCl3 + 3H210 No reaction with water at any temperatureNi + 2HCl NiCl2 + H22Ni + O2 2NiO
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