Posted by Lisa on Tuesday, April 8, 2008 at 5:49pm.
It won't help you learn how to do these for me to do them for you. Here are several sites within this one site that tells you how to balance equations as well as the types of reactions. It is important that you understand how to do it. Read through this material and do the best you can, THEN post one question at a time for us to check it. Please include with your post exactly what trouble you have knowing where to go for the next step.
In a supplementary post I will do the first one for you.
I didn't post the site.http://dbhs.wvusd.k12.ca.us/webdocs/Equations/Equations.html
1) Sodium reacts with iron(lll)oxide to produce sodium oxide and iron.
Can you write the formulas for each element and compound? The problem TELLS you what the products are.
Na + Fe2O3 ==> Na2O + Fe
To balance, it is a process of trial and error. Rule #1--You MAY NOT (I repeat--may NOT) change any of the subscripts to make the equation balance. Rule #2. You MAY change ONLY the coefficients.
Now, I look at the equation and I see 2 Na atoms on the right from Na2O so we should place a 2 in front of the Na atom on the left.
2Na + Fe2O3 ==> Na2O + Fe
Next, we can balance the Fe by placing a 2 on the right to make 2 Fe atoms.
2Na + Fe2O3 ==> Na2O + 2Fe.
That leaves only oxygen to do and one look tells us we have a problem. We have 3 O atoms on the left and we need to make 3 on the right. To do that we place a 3 for Na2O BUT that messes up the Na you say. You're right. That's the trial and error part. So lets place a 3 for Na2O.
2Na + Fe2O3 ==> 3Na2O + 2Fe
Recount the Na and we see we have 6 on the right so we need to change that 2 for Na on the left to a 6
6Na + Fe2O3 ==> 3Na2O + 2Fe
Now we check everything to see that it is balanced. You can ALWAYS do this (and should) so you will ALWAYS know if the equation is balanced or not.
I see 6 Na on the left and 6 on the right. There are 2 Fe on the left and 2 on the right. There are 3 O on the left and 3 on the right. So everything balances.
Type of reaction: You have a single atom replaces an atom in a compound so this is a single replacement reaction. The Na atom simply replaces the Fe in the compound of Fe2O3 to Fe by itself.
How many moles of chlorine gas react with 1 mol of hydrogen gas according to the balanced chemical equation?
H2(g) + Cl2(g) → 2 HCl(g)
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