Counting Atoms in Compounds
A Grade 6 science worksheet focused on understanding and counting atoms within common chemical compounds.
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Standards
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Counting Atoms in Compounds
Name:
Date:
Score:
Read each question carefully and follow the instructions to count the atoms in the given chemical compounds.
1. A chemical is a substance formed when two or more chemical elements are chemically bonded together.
2. The small number written after an element symbol (like the '2' in H2O) is called a .
3. If there is no subscript written after an element symbol, it means there is only atom of that element.
Count the number of atoms for each element in the following compounds:
4. H2O (Water)
Hydrogen:
Oxygen:
5. CO2 (Carbon Dioxide)
Carbon:
Oxygen:
6. How many total atoms are in one molecule of NaCl (Sodium Chloride)?
1
2
3
4
7. How many oxygen atoms are in the chemical formula H2SO4 (Sulfuric Acid)?
1
2
3
4
8. The chemical formula for glucose is C6H12O6. This compound contains only 3 atoms.
True
False
9. In the compound NH3 (Ammonia), there are three nitrogen atoms.
True
False
10. Consider the compound Al2(SO4)3 (Aluminum Sulfate). How many atoms of each element are present?
Aluminum (Al):
Sulfur (S):
Oxygen (O):
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