Write a balanced equation for:
1. the reaction of chromium with sulfur
2. the reaction of bismuth with oxygen
Chromium is a transition metal and sulfur has a 2- charge.
The Attempt at a Solution
For the first one, I'm thinking that since sulfur has a 2- then chromium must have a 2+ charge so it would form a product of CrS. I thought it would just be Cr + S ----> CrS
That's before balancing of course but that's not the answer either. It's supposed to be Cr + S ----> Cr2S3 (before balancing)
Why are there subscripts?
The second one makes absolutely no sense to me because O is 2- and Bi is I believe 3-.