1) complete and balance the following: Mg + O2 --- Zn + HCL --- Zn + Cu 2+ ----

Question

1) complete and balance the following:    Mg + O2 ---    Zn + HCL ---    Zn + Cu 2+ ---- 2) balance the following reactions and identify the speciesthat have been oxidized and the species that have beenreduced.    CL2 + I - ----   I 2 + CL-    WO2 + H2 -----   W +H2O    Ca  + H20 ------  H2 + Ca(OH)2    4 AL + 3O2 -----   2 AL203 1) complete and balance the following:    Mg + O2 ---    Zn + HCL ---    Zn + Cu 2+ ---- 2) balance the following reactions and identify the speciesthat have been oxidized and the species that have beenreduced.    CL2 + I - ----   I 2 + CL-    WO2 + H2 -----   W +H2O    Ca  + H20 ------  H2 + Ca(OH)2    4 AL + 3O2 -----   2 AL203

Explanation / Answer

1) a) 2Mg + O2 ---> 2MgO b) Zn + 2HCl ---> H2 + ZnCl2 c) Zn0 + Cu2+ ---> Zn2+ +Cu0 2) Use oxidation numbers and/or the formal charges to determineredox. If oxidation number increases from reactants to products,oxidation has occured. If oxidation number reduces from reactantsto products, reduction has occurred. a) Cl2 + 2I- ---> I2 +2Cl- Oxidized: I- Reduced: Cl2 b) WO2 + H2 ---> W + H2O Oxidized: H2 Reduced: W c) Ca + H2O ---> H2 +Ca(OH)2 Oxidized: Ca Reduced: H2O d) 4Al + 3O2 ---> 2Al2O3 Oxidized: Al Reduced: O2

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