Counting Atoms in Chemical Formulas
A Grade 10 science worksheet focusing on counting atoms in various chemical formulas, including those with parentheses and coefficients.
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Counting Atoms in Chemical Formulas
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Read each chemical formula carefully and determine the number of atoms for each element present. For compounds with coefficients, remember to multiply all atoms by the coefficient. For polyatomic ions in parentheses, multiply the subscript outside the parentheses by the subscripts inside.
1. In H₂O, there are Hydrogen atoms and Oxygen atoms.
2. In CO₂, there is Carbon atom and Oxygen atoms.
3. In NaCl, there is Sodium atom and Chlorine atom.
4. How many atoms of each element are in C₆H₁₂O₆ (glucose)?
5. Determine the number of atoms for each element in H₂SO₄ (sulfuric acid).
6. How many oxygen atoms are in Ca(NO₃)₂?
3
6
2
5
7. For Al₂(SO₄)₃, how many sulfur atoms are there?
1
3
4
12
8. List the number of atoms for each element in 3H₂O.
9. How many aluminum and oxygen atoms are present in 2Al₂(O₃)?
10. In the chemical formula 4Fe₂(CO₃)₃, there are a total of 12 carbon atoms.
True
False