1. I can balance a chemical equation.
January 16, 2018
Answer is F
I can balance a chemical equation.

4. Last week we learned how to count atoms in molecules/compounds.
Let’s recall: How many atoms are in each molecule below?
2C3H8
6 carbon atoms, 16 hydrogen atoms, total of 22 atoms
Na2SO4
2 sodium atoms, 1 sulfur atom, 4 oxygen atoms, total of 7 atoms
2(NH4)3PO4
N = 6
H = 24
P = 2
O = 8
Total = 40 atoms
I can balance a chemical equation.

5. Now it’s time to apply what we learned about counting atoms to balancing chemical equations..
Remember: Mass of reactants = mass of products
All of the atoms present at the beginning of the reaction are present at the end of the reaction but they are rearranged
I need to end with only 1 carbon atom.
So if I start with 1 atom of carbon…
I can balance a chemical equation.

6. Rules for balancing equations…
NEVER touch/change the subscripts!!!!
You also can’t add subscripts!!!!
You can only add coefficients.
You may not add coefficient in the ‘middle’ of a chemical formula.
Ex: CaCl Ca2Cl
You must end up with the same number & kinds of atoms on both sides of the equation when you are finished. Count atoms on both side to check yourself.
I can balance a chemical equation.

8. I can balance a chemical equation.

9. I can balance a chemical equation.

10. Balancing Equations Cl Cl Cl Cl H H H H H2 + Cl2  2 HCl (balanced)
(unbalanced)
H2 + Cl2  2 HCl
(balanced)

11. 1st Step: Draw a T chart below the equation.
2nd Step: write how many of each reactant you have.
3rd Step: write how many of each product you have. 2 2
4th Step: Are you in balance? No
H = 2
O = 2 4
H = 2
O = 1 4 2
5th Step: Adjust the coefficients to balance the equation.
Final Step: Count atoms on each side.
includes pratice questions

14. With your group…