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We just started anew chapter in Chemistry today and was wondering how you predict the products....


I.E.

2Mg(s)

I was never any good at chemistry. Now I know why.

Sorry I can't help but I felt like pointing that out.

H20 means two hydrogens, one oxygen. AKA water

2H20 means two copies of the two hydrogen, one oxygen pair. AKA 2 molecules of water

not sure if that's what your looking for or not....

Lucky you, we're on this unit and I'm good at it.

What you first do for this type of equation is write out the two things being added on the other side.  So we start with

Fe + O2 -> FeO

The two substances are combining in a chemical reaction that is called a synthesis reaction.  You may or may not have learned this already.  Look at the equation-it is incorrect because it is not balanced.  So make your table (this one can be eyeballed but I'm using it as an example)

     Reactants  Products
Fe                1             1

O                 2             1

There is only one O on the products side, while there is 2 on the reactants side.  So balance it.

2Fe + O2 -> 2FeO is the final answer.

IMPORTANT: You CANNOT make or destroy matter.  This means you CANNOT change subscripts, so don't worry about them (at least for now-you'll need to predict subscripts later on).  Only worry about adding big numbers.

Ok, I had a big thing for the next problem, but I'm on spring break and I've forgotten-gimme a bit and I'll see what i can remember (MAN it goes fast)

EDIT: The second equation that you give looks like a single replacement rxn to me-is it?  Because if it isn't, I'm not sure how to do it.

Don't forget about the annoying ones...Iron III Oxide, Iron II Oxide, Iron IV Oxide....

Gives you Fe2O3, FeO, and FeO2...respectively....

who ever invented chemistry deserves to be shot

Here an easy way to see it

1. whip out the periodic table

Fe + O2

2. You see that Fe has an oxidation state of 2 and 3. You didn't say if it was Iron [II] or Iron [III] so i'll go with 3 being the most stable one.

Now you have Fe as Fe+++

3. See the oxidation state of Oxygen (
O- -)

Note: when Oxygen is alone, It is always O2 because its the only way its stable when alone

Now you Have

Fe+++ and O - -

So you switch the charges (Valencies) Fe2 (the 2 "--" charges from O) and O 3 (the 3 "+++" charges)

So you have

Fe + O2 --> Fe2O 3


4. You got the equation, but now you have a problem

there's one Iron and 2 oxygens on the left and 2 Iron and 3 oxygens on the right so now we have to balance.

5. You can put numbers in front of the Molecules, but now you cant change the subscripts, only the # of molecules.

so

If you put a 2 in Front of the first Fe, a 3 in front of the O2 molecule both from the left. Then you put a 2 in front of the Fe2O 3 molecule you get

4Fe + 3O2 --> 2Fe2O 3 molecule you get

On the left: 4 Irons 6 oxygens (3molecules of 2 O each)

On the right: 4 Irons and 6 Oxygens (2 mol of 2 Fe and 3

now you have a balanced equation and you are done



You learn a lot when you have a horrible chemestry teacher that doesn't really know what shees doing So I would like to thank my chemestry teacher for being such a bad teacher, it helped me learn it better myself. Im not being sarcastic I'm really thankfull

Enjoi and Good night

  LOL....Jeez lads ..don't we have some brainboxes here on SimV...............I went beyond all that kid stuff after I made the astounding discovery that E=mc2...commoner.

..That was before A.E. thought of it  ;)

You learn a lot when you have a horrible chemestry teacher that doesn't really know what shees doing So I would like to thank my chemestry teacher for being such a bad teacher, it helped me learn it better myself. Im not being sarcastic I'm really thankfull

Oh man, you thought you had a bad Chem teacher, last semester I had a professor who could not speak english at all.  It took us three weeks to figure out that Kappa was actually Carbon and stuff like that.  Learned to research my professors after that, now my professor this semester isthe guy that wrote the text book we're using and let's just say it's going a lot better now.

Ouch. My brain hurts. Been a long time since I really studied chem., and I blame very boring teachers for my lack of diligence. Good to see somebody at it, though- you kids have fun, now.

H20 means two hydrogens, one oxygen. AKA water

2H20 means two copies of the two hydrogen, one oxygen pair. AKA 2 molecules of water

not sure if that's what your looking for or not....

Ummm, I do believe that H2O2 is hydrogen peroxide....  ;)

Ummm, I do believe that H2O2 is hydrogen peroxide....

H2O2 is hydrogen peroxide, but he said 2H2O as in two water molecules.

Anyone up for an ice cold glass of dihydrogen monoxide?

[quote]

Oh man, you thought you had a bad Chem teacher, last semester I had a professor who could not speak english at all.

WHOOSH!

That is the sound of this thread going way over my head...