1. What fundamental law is demonstrated in balancing equations?

2. What is meant by a balanced equation?
3. When balancing an equation, should you adjust the subscripts or the coefficients?
4. Balance the following equations.
a) ZnS + O2 -> ZnO + SO2
b) Fe2O3 + CO -> Fe + CO2
c) AgNO3 + AlCl3 -> AgCl + Al (NO3)3
5. Balance the following equations.
a) (NH4)2Cr2O7 -> Cr2O3 + N2 + H2O
b) NH3 +CuO -> N2 + Cu + H2O
c) Na2SiF6 + Na -> Si + NaF

Answer:
1. What fundamental law is demonstrated in balancing equations? Conversation of mass principle. The mass is mot created or destroyed but can be converted from one form to another.

2) What is meant by a balanced equation? Is that the total number of moles of each element in the reaction are the same on both sides of the equation.

3. When balancing an equation, should you adjust the subscripts or the coefficients? No, this is never done.

4) a) 2ZnS + 3O2 -> 2ZnO + 2SO2
b) Fe2O3 + 3CO -> 2Fe + 3CO2
c) 3AgNO3 + AlCl3 -> 3AgCl + Al (NO3)3

5. Balance the following equations.
a) (NH4)2Cr2O7 -> Cr2O3 + N2 + 4H2O
b) 2NH3 + 3CuO -> N2 + 3Cu + 3H2O
c) Na2SiF6 + 4Na -> Si + 6NaF
w0w!..this are really easy...

but you should also learn how to do this by your own...

im gonna help you with some but not all....

1. law of conservation of mass but to be sure use this site coz there are more laws...

http://www.nyu.edu/classes/tuckerman/hon...

2. the equation is balance when both the reactant and product has the same values...

3. you should adjust the coefficients not the subscripts because if you adjust the subscripts you're violating the law of conservation of mass

4) a. 2Zn + 3 O2 -> 2ZnO + 2SO2
b. Fe2 O3 + 3CO -> 2Fe + 3 CO2
c. 3AgNO3 + AlCl3 -> 3AgCl + Al(NO3)3


okay,,do the rest....it's really easy.....

if you can't understand my answers and if you still have problems feel free to email me and put "balancing equations" as your subject...

i have the answers for no.5 but i want you to do it by yourself so you'll learn...

one more thing, don't you have a chemistry textbook??...using your textbooks are very useful.....you know....

good luck!

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