Better Students Ask More Questions.
http://home.comcast.net/~cochranjim/PDFS2/BCEWS6.pdfi have to answer the questions...
i have to answer the questions in the link above 1-20 as an extra credit assignment..pleaseee help???? :?
2 Answers | add yours
Those questions each have to do with balancing a chemical equation. We can look at question number 1 as an example of how to complete the remaining questions:
____Al + ____S ----------> ____Al2S3
To balance a chemical equation like the above is easy; just ask the question, "How many Al atoms do I need, and how many Sulfur atoms do I need?" The '2' after the Al means that you end up with two Al atoms. Likewise, the '3' after the 'S' means that you end up with 3 sulfur atoms for every two aluminum atoms. So your answer is:
__2__Al + __3__S ----------> __1__Al2S3
What if you have more atoms on one side than the other? Then increase the number of atoms produced. For example,
____Zn + ____O2 ----------> ____ZnO
ZnO only has 1 oxygen, but the reaction is with O2, which has two oxygens. So, increase the number of ZnO molecules to 2:
____Zn + ____O2 ----------> __2__ZnO
Now, perform the same operation as in the first example: you need 2 Zn atoms, and 2 O atoms:
__2__Zn + __1__O2 ----------> __2__ZnO
Posted by kjcdb8er on January 19, 2011 at 10:44 AM (Answer #1)
there's several pages ...i only need the last page 1-20
Posted by camil on January 13, 2011 at 3:35 AM (Answer #2)
Join to answer this question
Join a community of thousands of dedicated teachers and students.