Question

12) 12) As defined in the text, identify the "gas evolution" reactions among the following 1. 2HCl(aq) +K2CO3(aq) --H2O(l) + CO2(g) + 2Cl(aq) 2. CH4(g)+202(g) + CO2(g) + 2H2O(1) 3. 2HCl(aq) +K2S(aq) -- H2S(g)+2KCl(aq) A) 1 and 2 only B) 1 and 3 only C) 2 and 3 only D) All of 1, 2, and 3 E) None of 1, 2, and 3 13) 13) Identify the oxidation-reduction reactions among the following: 1. Zn(s)+Cu2(aq) -- Zn2+aq) + Cu(s) 2. 2 Na(s) + Cl2(aq) + 2NaCl(s) 3.2 Mg(s)+O2(g) + 2 Mgo A) 2 and 3 only B) 1 and 3 only C) 1 and 2 only D) All of 1, 2, and 3 E) None of 1, 2, and 3 14) 14) The reaction CH4 (8)+2 O2(g) + CO2(g) + 2 H2O(g) is: A) a combustion reaction. B) an exothermic reaction. C) a redox reaction. D) all of the above E) none of the above

Answer 1

1. 2HCl(aq) + K2CO3(aq) ------> H2O(l) +CO2(g) + 2KCl(aq)
2. 2HCl(aq) + K2S(aq) --------> H2S(g) + 2KCl(aq)
B. 1 and 3 only >>>>answer
13.1. Zn(s) + Cu^2+ 9aq) -------> Zn^2+ (aq) + Cu(s)
   Zn under goes oxidation and Cu under goes redction. It is redox reaction
2. 2Na(s) + CL2(aq) ------> 2NaCl(s)
   The oxidation sate of Na increases from 0 to +1 . it is xodation . The oxidation sate of Cl decreases from 0 to -1. It is reduction.
    It is redox reaction
   3. 2Mg(s) + O2(g) -----> 2MgO(s)
The oxidation sate of Mg increases from 0 to +2 . it is xodation . The oxidation sate of O decreases from 0 to -2. It is reduction.
    It is redox reaction
D. All of 1,2 and 3 >>>>answer
14.CH4(g) + 2O2(g) ----------. CO2(g) +2H2O(g)
It is combustion reaction. All combustion reactions are exothermic reactions. The oxidation state of C increases from -4 to +4. It is oxidation . The oxidation state of O decreases from 0 to -2. It is reduction. It is redox reaction.
D.all of the above>>>answer