Are this right? *chemistry experts only* ?

Question

Br+Nal = Na Br + l

NH4No3+o2= NH4O2+No3

C3H8O+O2=OH5+CO8

NH3+ZNl2=zn(NH3)2+l

bi+o2=bio2

Answer 1

These all seem to be incorrect.

1. Br occurs as Br2, and it will displace iodide ion from its compounds:

Br2 + 2NaI -----> I2 + 2NaBr

2. Ammonium nitrate is an oxidizing agent, and will not react with oxygen, as far as I know.  It will decompose when heated:

2NH4NO3 -----> 2N2 + 4H2O + O2

3. C3H8O would be propanol.  It will combust in oxygen to form carbon dioxide (CO2) and water (H2O):

2C3H7OH + 9O2 -----> 6CO2 + 8H2O

4.  This seems to be a complex ion formation reaction.  The zinc ion will coordinate with the ammonia to form the diamminezinc ion:

ZnI2 + 2NH3 -----> [Zn(NH3)2]I2

5.  Bismuth is most commonly found in oxidation state 3+ (sometimes in 5+ as well).  Thus, the oxide that we would expect to form would be Bi2O3 (oxide has a 2- charge, so Bi must have a 3+ charge to balance the charges and get a neutral molecule):

4Bi + 3O2 -----> 2Bi2O3

Perhaps you should have your teacher go over some of these reactions with you after class, or get a tutor to help you.  It just takes some practice and memorization to figure out what's going on with these.