Counting Atoms in Chemical Formulas
This worksheet helps Grade 11 students practice counting atoms in various chemical formulas, including those with subscripts, coefficients, and parentheses.
Includes
Standards
Counting Atoms in Chemical Formulas
Name:
Date:
Score:
Read each chemical formula carefully and determine the number of atoms for each element present. Show your work where indicated.
1. In H₂O, there are hydrogen atoms and oxygen atoms.
2. For CO₂, there is carbon atom and oxygen atoms.
3. C₆H₁₂O₆ contains carbon atoms, hydrogen atoms, and oxygen atoms.
4. How many atoms of each element are in 2H₂SO₄?
Hydrogen:
Sulfur:
Oxygen:
5. Determine the number of atoms for each element in 3Ca(OH)₂.
Calcium:
Oxygen:
Hydrogen:
6. How many total atoms are present in the chemical formula Al₂(SO₄)₃?
8
14
17
20
7. In the formula Mg₃(PO₄)₂, there are 8 oxygen atoms.
True
False
8. A compound has the formula (NH₄)₃PO₄. How many atoms of each element are present?
Nitrogen:
Hydrogen:
Phosphorus:
Oxygen:
9. Explain the difference between a subscript and a coefficient in a chemical formula, and how each affects the atom count.
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