2 Rules for Writing and Balancing Equations: 1.Determine the correct formulas for all the reactants and products.2.Write the skeleton equation. (Use + signs between products and to separate reactants from products.)
3 3.Count the number of atoms of each element in the reactants and products…left…right…left…right…left…right4.Balance the elements one at a time by using coefficients. (if no coefficient, assume it to be 1). NEVER balance an equation by changing a subscript!
4 5.Check each atom when you’re done to be certain they are equal on both sides of the equation. 6.Make sure all your coefficients are in the lowest possible ratio.
5 Count how many of the first element you have on the reactant side. Zn + HCl ZnCl2 + H21 ZnCount how many of the first element you have on the reactant side.
6 Zn + HCl ZnCl2 + H21 Zn1 ZnThen count how many of that SAME element you have on the product side.
7 Zn + HCl ZnCl2 + H221 Zn1 Zn2H1HIf the two numbers are equal, go to next element. If not equal, add a coefficient in front of that compound to make them equal.
8 Zn + 2HCl ZnCl2 + H2Continue moving from left to right counting atoms on both sides of the equation and adding coefficients when needed.
9 Zn + 2HCl ZnCl2 + H2When you reach the go back to the beginning and recheck everything…left to right, left to right, left to right.
10 Zn + 2HCl ZnCl2 + H2Check your equation one more time to make sure it’s correct. Left to right, left to right, left to right…