Question

Specify which of the following are redox reactions and identify the oxidizing agent, the reducing agent, the substance being oxidized, and the substance being reduced.

a) Ba(s) + MgCl₂(aq) --> Mg(s) + BaCl₂(aq)

b) HNO₃(aq) + NH₄OH(aq) --> NH₄NO₃(aq) + H₂O(l)

c) SiCl₄(l) + 2Ca(s) --> 2CaCl₂(s) + Si(s)

d) 2Cr(s) + 6HCl(aq) --> 2CrCl₃(s) + 3H₂(g)

Answer 1

a) Ba(s) + MgCl₂(aq) --> Mg(s) + BaCl₂(aq)

sbstance oxidized: Ba (from 0 to +2)

sbstance redced: MgCl2 (from +2 to 0)

Oxidizing agent: MgCl2

redcing agent: Ba

b) HNO₃(aq) + NH₄OH(aq) --> NH₄NO₃(aq) + H₂O(l)

This is not a redox reaction

c) SiCl₄(l) + 2Ca(s) --> 2CaCl₂(s) + Si(s)

sbstance oxidized: Ca (from 0 to +2)

sbstance redced: SiCl4 (from +4 to 0)

Oxidizing agent: SiCl4

redcing agent: Ca

d) 2Cr(s) + 6HCl(aq) --> 2CrCl₃(s) + 3H₂(g)

sbstance oxidized: Cr (from 0 to +3)

sbstance redced: HCl (from +1 to 0)

Oxidizing agent: HCl

redcing agent: Cr