Chemistry 122 d

Question

Balance the following chemical reactions, determine the type of reaction and whether each is a redox reaction: (NH4)2Cr2O7 = N2 + H2O + Cr2O3

Answer 1

The balanced equation is ...

(NH₄)₂Cr₂O₇ ==> N₂ + Cr₂O₃ + 4H₂O

Is this a redox reaction? Yes.

How do you know?

Compare oxidation numbers for N and Cr on each side of the equation.

N goes from 3- on the left to zero on the right. It was oxidized.

Cr goes from 6+ on the left to 3+ on the right. It was reduced.