Oxidation-Reduction Reactions Date Name PRE-LAB QUESTIONS 1. In the following eq
ID: 707208 • Letter: O
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Oxidation-Reduction Reactions Date Name PRE-LAB QUESTIONS 1. In the following equations for familiar reactions, write an R over the reducing agent and an O over the oxidizing agent. At the right, indicate the change in oxidation number per atom for each element whose oxidation number changes. If there is no change, write in "no change in oxidation number. Oxidation Number Oxidation Number Atom Atom Reactiorn Oxidized Increase Reduced Decrease per Atom per Atom 2Al(s)+3C1,() 2Al+6CI Ag' +C AgCI(s) Mg(s)+ 2H Mg H(g) Cu2+ + H2S(g) CuS(s) + 2H' Ba(s)+ 2H,O Ba+20H+H,(g) 6Na +2CrO+20H CO2(g) + H2O ? H,COs(aq) CO,(g) +C(s) 2COg) HCl(g) + NH3(g) ? NH4Cl(s) 2ZnS(s)+30,(8) + 2Zno(s) +2S0,(g) 4H + + 2Cl. + Mno,(s) ? Mn2+ + C12(g) 10H. + SO42-+ 8!--412(s) + H2S(g) + 4H,O 103Explanation / Answer
1. Al is oxidised and its oxidation number increased per atom is +3
Cl is reduced and it's oxidation number decreases per atom is -1
2. Cl is oxidised and it's oxidation number increases per atom is 1.
Ag is reduced and it's oxidation number decreased per atom is 1.
3. Mg is oxidized and it's oxidation number increased is 2.
H+ ion is reduced and it's oxidation number reduced per atom is 1.
4. None of them oxidized and reduced. The reaction is simply double displacement reaction.
5. Ba is oxidized and it's oxidation number per atom increased is 2.
H is reduced and it's oxidation number per atom decreased is 1.
6. Cr is oxidized and it's oxidation number per atom increased is 3.
Oxygen (From Na2O2) is reduced and it's oxidation number per atom reduced is 1.
7. None of them neither reduced nor oxidized.
8. C from C( solid) is oxidized and it's oxidation number increased per atom is 2.
C from CO2 is reduced and it's oxidation number decreased per atom is 2.
9. ---
10. S is oxidized and it's oxidation number per atom increased is 2.
O is reduced and it's oxidation number decreased per atom is 2.
11. Cl is oxidized and it's oxidation number per atom increased is 1.
Mn is reduced and it's oxidation number decreased per atom is 2.
12. I is oxidized and it's oxidation number per atom increased is 1.
S is reduced and it's oxidation number per atom decreased is 8.
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