[Athymy]

Hi guys, I've recently started with reaction formulas and such but I don't get it, here's the question.

What will be formed in the following chemical reactions?

C₃H₈(g)+O₂(g) (my guess) 3C₂+4H₂O

I balanced the left hand side to C₃H₈(g)+6O₂

So when carbon and hydrogen reacts with oxygen, carbon dioxide and water is formed but what happens when  for example it reacts with Br₂ och H₂ or something other than oxygen?

Thanks in advance!

EDIT: Noticed that I balanced wrong but the question remains, what happens when it is not reacted with oxygen.

[AWK]

Why not
C₃H₈(g)+5O₂(g)  = 3CO₂+4H₂O

[Athymy]

Yeah, it's not the balancing part which I don't get, it is the "what will be produced part". I have a bunach of alkanes and alkenes which are reacting with various things (oxygen,hydrogen,bromine etc) and my question is how do I know what will be produced?

I just happened to know that when it reacts with oxygen, CO2 and H2O is produced, it is the others which I don't know.

[XGen]

Have you heard of hydrogenation or halogenation reactions?

Reaction with oxygen is just combustion.

[Arkcon]

What you've described is a combustion reaction, and we generally describe hydrocarbons and oxygen as going completely to CO₂ and H₂O.  There's no way to know just by looking at random starting reactants to know the products.  In high school level chemistry, they have to give you some sort of hint, like XGEN: said.