Question

hey.. Can you balance these? :)

CaCO3 + KCl --> CaCl2 + K2CO3"

FeCl3 + MgO --> Fe2O3 + MgCl2

AlF3 + CaO --> Al2O3 + CaF2

CH4 + O2 --> CO2 + H2O

C6H6 + O2 --> CO2 + H2O

C3H8 + O2 --> CO2 + H2O

Answer 1

I think it might serve you better if I help you by doing one for you and explaining it to you step-by-step. You can do the others by yourself. Post your answers and I will tell you if they are right or wrong. If they're wrong, I can explain to you why they're wrong and how you can fix them :)

EXPLANATION:
First off, to balance the equation, it means you need to have a 1:1 ratio on the left and on the right. This means that if you have 2 calcium molecules on one side, you must have 2 molecules of calcium on the right side!
For number one, here is how the ratio is
On the LEFT:
Ca = 1
CO3 2- = 1
K = 1
Cl = 1
On the RIGHT:
Ca = 1
Cl = 2
K = 2
CO3 2- = 1
However, when your balancing, the number you place is like multiplication and gets distributed to the whole molecule. That means, if you have 2H2O it means you have 4 H's and 2 Oxygens. Notice, if I place a 2 next to KCl on the left, I get 2 K's and 2 Cl's. Now, you have
On the LEFT:
Ca = 1
Cl = 2
K = 2
CO3 2- = 1
and
Ca = 1
Cl = 2
K = 2
CO3 2- = 1
on the RIGHT! T
Therefore, your equation is balanced!