Counting Atoms in Chemical Formulas
A Grade 9 science worksheet to practice counting atoms in various chemical formulas, including those with parentheses and coefficients.
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Counting Atoms in Chemical Formulas
Name:
Date:
Score:
Read each chemical formula carefully and determine the number of atoms for each element present. Write your answers in the spaces provided.
1. H₂O
Hydrogen (H): Oxygen (O):
2. CO₂
Carbon (C): Oxygen (O):
3. NaCl
Sodium (Na): Chlorine (Cl):
4. C₆H₁₂O₆
Carbon (C): Hydrogen (H): Oxygen (O):
1. Ca(OH)₂
Calcium (Ca): Oxygen (O): Hydrogen (H):
2. Al₂(SO₄)₃
Aluminum (Al): Sulfur (S): Oxygen (O):
3. Mg(NO₃)₂
Magnesium (Mg): Nitrogen (N): Oxygen (O):
1. 2H₂O
Hydrogen (H): Oxygen (O):
2. 3CO₂
Carbon (C): Oxygen (O):
3. 4NaCl
Sodium (Na): Chlorine (Cl):
1. 2Ca(OH)₂
Calcium (Ca): Oxygen (O): Hydrogen (H):
2. 3Al₂(SO₄)₃
Aluminum (Al): Sulfur (S): Oxygen (O):
3. 5Mg(NO₃)₂
Magnesium (Mg): Nitrogen (N): Oxygen (O):
1. In the formula C₃H₈, there are 3 carbon atoms and 8 hydrogen atoms.
True
False
2. The formula 2KCl indicates a total of 2 potassium atoms and 2 chlorine atoms.
True
False