Counting Atoms & Balancing Equations Worksheet
Counting Atoms & Diagramming Chemical Equations Worksheet
Part A: Directions:
1) If there is a subscript, circle it.
2) If there is a coefficient, draw a square around it.
3) Count how many atoms of each element there are.
HINT: If there is no coefficient AND no subscript right after the chemical symbol, there is 1 atom of that element.
|Note: ALL examples need to have their subscripts circled and coefficients boxed. |
| | | |
|Example 1: O2 |Example 2: CaCl2 |Example 3: 3CaCl2 |
|2 O’s (oxygen) O=2 |1 Ca(calcium) Ca=1 |3 Ca’s(calcium) Ca=3 |
| |2 Cl’s(chlorine) Cl=2 |6 Cl(chlorine) Cl=6 |
|1. P4 |2. H2 |3. F6 |
|P= |H= |F= |
|4. CH4 |5. CaBr2 |6. H2O2 |
|C= |Ca= |H= |
|H= |Br= |O= |
|7. NaOH |8. Na2SO4 |9. LiNO3 |
|Na= |= |= |
|O= |= |= |
|H= |= |= |
|10. 2NaOH |11. 3Na2SO4 |12. 4LiNO3 |
|Na = |= |= |
|O = |= |= |
|H = |= |= |
More practice on the back!
Part B: Directions:
1) Diagram the following equations by:
a. circling the reactants in the equation
b. Putting a square around the products in the reaction
2) Count the # of atoms on each side and write it down.
3) Answer if the equation is balanced or not by circling yes or no.
|Example 4: |Example 5: |
|HgO → Hg + O2 |CH3 + 2O2 CO2 + 2H2O |
|Products Reactants |Products Reactants |
|Hg = 1 Hg = 1 |C= 1 C=1 |
|O =1 O =2 |H= 3 H=4 |
|Is this equation balanced? Yes / No |O= 4 O=4 |
| |Is this equation balanced? Yes / No |
| | |
|P + O2 → P4O10 |Mg + O2 → MgO |
|Products Reactants |Products Reactants |
|P = P = |Mg = Mg = |
|O = O = |O = O = |
|Is this equation balanced? Yes / No |Is this equation balanced? Yes / No |
| | |
|4 Fe = 3O2 → 2 Fe2O3 |Al2O3 → Al + O2 |
|Products Reactants |Products Reactants |
|Fe = Fe = |Al = Al = |
|O = O = |O = O = |
|Is this equation balanced? Yes / No |Is this equation balanced? Yes / No |
|CHALLENGE (#17) |
|BaCl2 + H2SO4 → BaSO4 + HCl |
|Products ___ Reactants |
| |
| |
| |
|Is this equation balanced? Yes / No |
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