When the half-reactions Br2 +2e- ? 2Br- and Na ? Na+ +e- are combined, the balanced redox equation is _____.
A.

Na + Br2 +e- ? Na+ + 2Br-

B.

2Na + Br2 ? 2Na+ + 2Br-

C.

Na + Br2 ? Na+ + 2Br-

D.

2Na + Br2 + 2e- ? 2Na+ + 2Br- + e-

Question

When the half-reactions Br2 +2e- ? 2Br- and Na ? Na+ +e- are combined, the balanced redox equation is _____.
 A.	
 
Na + Br2 +e- ? Na+ + 2Br-
 
 B.	
 
2Na + Br2 ? 2Na+ + 2Br-
 
 C.	
 
Na + Br2 ? Na+ + 2Br-
 
 D.	
 
2Na + Br2 + 2e- ? 2Na+ + 2Br- + e-

aaronq · Answer

you need to have the atoms and charges balanced on both sides. 

Hint: ions add to the charge