Redox reactions? (HELP!?)?
Which of the following are redox reactions? And tell why?
[ i have a test tomorrow and i do not get this! ]
a) Al2O3 ----> 4Al + 3O2
b) SiCl4 + 2Mg ----> Si + 2MgCl
c) H2SO4 + 2NaOH ----> Na2SO4 + 2H20
d) AgNo3 + NaCl ----> AgCl + NaNO3
THanks so much!
- Caroline MillerLv 79 years agoFavorite Answer
SiCl4 + 2Mg --> Si + 2MgCl2
Si in SiCl4 = 4+ and becomes 0 as the neutral element, reduced by Mg, gained 4 electrons
Mg starts at 0 and becomes 2+ in MgCl2, oxidized by Si, loses 2e- / Mg atom
Al2O3 --> deomposition, no oxidation state changes
H2SO4 + 2NaOH --> acid base, no oxidation changes
AgNO3 + NaCl --> double replacement, no oxidation changes