[Gugols]

Hi, I learned "Balancing Chemical Equations?" where you have formula like this:

Al + O₂ Al₂O₃

So you need to balance. Can you explain how you call these ones(in English) where you don't have the part after  and you need to write them by self?

I need to know this because I'm learning with youtube vids and I need to know what to search for.

[Borek]

Not sure what you are asking about. Something like just Al + O₂? I would call it list of reactants (reagents), but as far as I can tell this is not something that is commonly used/named for any specific purposes.

What is context of your question?

[Gugols]

Well I learned how to balance these things.

In my last test there was formula:

Al + O₂ Al₂O₃

So when I balanced I got:
2Al + 1.5 O₂   Al₂O₃

But in my next test I will need to write the last part by self.

It will look like this:

Al + O₂ ?

There will not be the second part.

Is there any term of this last "balancing" example?

Sorry, English isn't my native lamguage and I don't know all these chemistry terms.

[Borek]

As far as I can tell there is no name for it - its just a list of reactants. And you are expected to predict products.

[Gugols]

Ok, maybe someone could give me some manuals or videos? I know that there was some order how to  combine these elements - like metals, hydrogen, oxides, etc. I don't know how.

[Borek]

Order in compound formulas, or order in which reactants are listed in the reaction equation?

Order in compound formulas is governed by IUPAC rules, which I don't remember - but if you put metal first, non-metal second, and if you follow H_xNm_yO_z scheme for oxoacids, you will be OK in most problems you will see learning chemistry.

There is no particular order of reactants in reaction equations. Most people I know will write

Al + O₂ -> Al₂O₃

instead of

O₂ + Al -> Al₂O₃

but as far as I know there is no defined convention and both versions are perfectly valid.

[Gugols]

No, I thought how I can write final "product" for this reaction:

How I can get(calculate) this green part of reaction:
Li₂Sio₃ + Ba(OH)₂   2LiOH + BaSiO₃

So my test question will be without this green part:
elemen + element   final product

I know how to balance it when I have this green part but how can I balance when I don't have it already - I need to "calculate" it(and then balance) but I don't know how to, and that's why I'm looking for manual, but I can't find it because I don't know how this green part finding is called...  

P.S. It's hard to explain what I want, because I don't know all these chemistry terms in English.

[Borek]

You are looking at the ways of predicting products. In short - that's what whole chemistry is about, don't be surprised if your search for a set of rules will not yield anything.

In simple cases like the ones you can be seeing now it is usually enough to remember that bases and acids react producing water and salt plus solubility rules to recognize what can precipitate out of solution.

[Gugols]

Thanks for explanation. I googl'ed and find something.
http://antoine.frostburg.edu/chem/senese/101/reactions/faq/predicting-products-nicl2-nh42s.shtml