Writing out chemical equations

  • Thread starter Ryuk1990
  • Start date
  • #1
158
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Homework Statement



Write a balanced equation for:

1. the reaction of chromium with sulfur

2. the reaction of bismuth with oxygen


Homework Equations



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-.
 

Answers and Replies

  • #2
954
117
Chromium is most commonly found in the +3 oxidation state.

Have you heard of covalent bonding?

Also, the way in which you refer to O as being "2-" etc. is incorrect. An atom is electrically neutral. What you actually mean is that oxygen tends to form O2- ions.
 
  • #3
Borek
Mentor
28,544
2,984
Bismuth - like chromium - likes +3, Bi3+.
 

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