I need some help with Science.?

Question

I need balanced equations for: (#)=subscript
1. HCl
2. H(2)O(2)---->H(2)O+O(2)
3. Mg+HCl---->H(2)+ MgCl(2)
4. N(2)+3H(2)---->2NH(3)

Answer 1

First, you don't need the () to show subscript.
Second, your balancing just indicates that the number of units for each element cited is the same on both sides of the equation. If it isn't you just change one of the COEFFICIENTS of each reactant/product until it does.
#1 is not a reaction. To form it, H2+Cl2 -> 2HCl.
note how the coefficients work.
In #2, you need more "O" on the left side. If you double it, you can balance the "O" by changing the coefficient of water to 2. So....
2 H2O2 -> 2H2O + O2.
You should be able to do the others.

Note that the elements H, N, O, F, Cl, Br, I occur naturally as DIMERS. One atom bonds with another.

Answer 2

=/ you really should learn how to do this.

1. i think this is already balanced..
2. 2H2O2--> 2H2O + 3O2
3. Mg + 2HCl--> H2 + MgCl2
4. this one is balanced.

Answer 3

1..HCl ===> HCl ... no problem.
2..2H2O2 ===> 2H2O + O2.
3..Mg + 2Cl ===> MgCl2
4..N2 + 3H2 ===> 2NH3...no problem.

Answer 4

2. H2O2--------->H2O+1/2O2 if you must have whole numbers
2H2O2------------>2H2O+ O2
3. Mg +2HCl--------->H2 +MgCl2
4. is already balanced