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Oxidation: When a substances loses electrons. Reduction: When a substance gains electrons. Consider: Ca(s) + 2H+(aq) D Ca2+(aq) + H2(g). The neutral Ca(s) has lost two e- to 2 H+ to become Ca2+. We say Ca has been oxidized to Ca2+ At the same time 2 electrons are gained by 2 H+ to form H2 . We say H+ is reduced to H2 ."Re           !( ( /    ' '' '''Redox Reaction with Air Consider the reaction of Ca with O2: 2Ca(s) O2(g) g 2CaO(s) Ca is easily oxidized in air. On the left we see freshly cut Ca. On the right we see Ca with a dull surface. On the surface, there is a coat of CaO. Again, Ca(s) gains electron and is oxidized to Ca+2 And the neutral O2 has gained electrons from the Ca to become O2- in CaO. We say O2 has been reduced to O2-. h%"            1  -    !Electron Transfer and Terminology""$5Lose electrons: Oxidation Gain electrons: Reduction.66 "It Takes Two: Oxidation-Reduction ##$In all reduction-oxidation (redox) reactions, one species is reduced at the same time as another is oxidized. Oxidizing Agent: The species which causes oxidation is called the oxidizing agent. The substance which is oxidized loses electrons to the other. The oxidizing agent is always reduced Reducing Agent: The species which causes reduction is called the reducing agent. The substance which is reduces gains electrons from the other. The Reducing agent is always oxidizedn (2(e ''2''e Oxidation of Metals with Acids It is common for metal to produce hydrogen gas when they react with acids. For example, the reaction between Mg and HCl: Mg(s) + 2HCI(aq) D MgCl2(aq) + H2(g) . In this reaction, Mg is oxidized and H in HCl is reduced. Note the change in oxidation state for these species: Mg0 g Mg+2 in MgCl2 & H+ in HCl g H0 in H2UZy: 7'''''''' (( ((((((  Redox reaction with Acid$It is possible for metals to be oxidized with salt: Fe(s) + Ni(NO3)2 (aq) g Fe(NO3)2 (aq) + Ni (s) . Molecular Equation The net ionic equation shows the redox chemistry well: Fe(s) + Ni+2(aq) g Fe2+(aq) + Ni (s) Net ionic Equation In this reaction iron has been oxidized to Fe2+ while the Ni+2 has been reduced to Ni0. What determines whether the reaction occurs ?Dv4       5        @    . y The Activity Series$lMetals can be placed in order of their tendencies for losing electrons. This is called the activity series.mmCompetition For e- Transfer*$ $ $Consider: Na, Mg, Al, Metallic character decreases left to right. Metal tend to give up electrons. Now consider the reaction: Na + AlCl3 g ??? (NaCl + Al) To determine if the reaction occurs, the question is to determine which metal has a greater affinity for electrons (or which is willing to lose e- ). Na is more willing to lose e- than Al Al is more willing to accept e- (less metallic) Conclude: The reaction occurs. 3Na + AlCl3 g 3NaCl + Al  i     u(yyyyyyy Reading Activity Table$A metal in the activity series can only be oxidized by a metal ion below it. In our example, Na is oxidized by Al. The metals at the top of the activity series are called active metals. hb  8 ( Example: Silver and Copper$If we place Cu into a solution of Ag+ ions, will copper plate out of solution ? Cu(s) + 2AgNO3(aq) g ? [Cu(NO3)2(aq) + 2Ag (s)] or Cu (s) + 2Ag+ (aq) g ? [Cu2+(aq) + 2Ag (s)] Which metal is active? Which is noble ? g Cu g Ag \ Therefore, Cu 2+ ions is be formed because Cu is above Ag in the activity series.IQ             *((( ( D Example: Redox Reaction$B&L 4.47: Based on the activity series, what is the outcome of the following reaction ? b) Ag(s) + PbNO3 (aq) g ? c) Cr (s) + NiSO4 (aq) g ? e) H2 (g) + CuCl2 (aq) g ? f) Ba (s) + H2O (l) g ? b) Ag vs. Pb , Pb is more active, no reaction occurs c) Cr vs. Ni , Cr is more active, reaction occurs Cr (s) + NiSO4 (aq) g Ni (s) + CrSO4 (aq) d) H2 vs. Cu , H2 is more active, reaction occurs H2 (g) + CuCl2 (aq) g 2HCl (aq) + Cu (s) e) Ba vs. H2 , Ba is more active, reaction occurs Ba (s) + H2O (l) g H2 (g) + Ba(OH)2 (aq)  X               ;(( <((((((((((((((( ( (( (&(((((((((((((((( (,((((((((((((( ((((( Summary(Redox - Oxidation/Reduction reaction Oxidation- Lose electron (LEO) Reduction- Gain electron (GER) Activity Series- Table showing elements relative ease of oxidation. 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Oxidation: When a substances loses electrons. Reduction: When a substance gains electrons. Consider: Ca(s) + 2H+(aq) D Ca2+(aq) + H2(g). The neutral Ca(s) has lost two e- to 2 H+ to become Ca2+. We say Ca has been oxidized to Ca2+ At the same time 2 electrons are gained by 2 H+ to form H2 . We say H+ is reduced to H2 ."Qe           !( ( /    ' '' '''Redox Reaction with Air Consider the reaction of Ca with O2: 2Ca(s) + O2(g) g 2CaO(s) Ca is easily oxidized in air. On the left there is shiny Ca metal. On the right we see a white powder  Cal     cium oxide. Again, Ca(s) loses electrons and is oxidized to Ca+2 And the neutral O2 has gained electrons from the Ca to become O2- in CaO. We say O2 has been reduced to O2-. h%"            y2  -