$aR \to bP, Rate = -\frac{1}{a} \frac{d[R]}{dt} = \frac{1}{b}\frac{d[P]}{dt}$

Jessie Chu 2G
Posts: 11
Joined: Fri Sep 26, 2014 2:02 pm

For problem 14.77 in the book, we are given three reactions:

a) NO+NO-->N2O2
b) Cl2-->Cl+Cl
c) NO2+NO2-->NO+NO3

According to the answer for part d of the question, b and c are radical chain initiating. Can someone explain to me what this means? Thank you!

Niharika Reddy 1D
Posts: 127
Joined: Fri Sep 26, 2014 2:02 pm

### Re: Radical Chain Initiating (14.77)

Radical chain initiating reaction means the reaction yields a product that is a radical- one that has an unpaired electron. Since Cl has 7 valence electrons and NO has 11, both of these products are radicals because they have an unpaired electron on the Cl and N respectively, which can be seen from drawing out their Lewis structures. Reactions b and c are thus potential radical chain initiating reactions.