Counting Atoms in Compounds
A Grade 7 science worksheet focused on understanding how to count atoms in chemical compounds using chemical formulas.
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Standards
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Counting Atoms in Compounds
Name:
Date:
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Read each question carefully and answer to the best of your ability. Show your work for counting atoms where indicated.
1. A chemical shows the elements in a compound and the ratio of atoms.
2. The small number written after an element symbol is called a .
3. If there is no subscript after an element symbol, it means there is only atom of that element.
4. How many oxygen atoms are in the chemical formula H₂O?
1
2
3
0
For each chemical formula, identify the elements present and count the number of atoms for each element, then state the total number of atoms.
5. CO₂
Elements and atoms:
Total atoms:
6. NaCl
Elements and atoms:
Total atoms:
7. C₆H₁₂O₆ (Glucose)
Elements and atoms:
Total atoms:
8. The chemical formula for water, H₂O, indicates there are two hydrogen atoms and one oxygen atom.
True
False
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