Counting Atoms in Compounds Worksheet
A Grade 10 chemistry worksheet focusing on counting atoms in chemical compounds, including those with parentheses and coefficients.
Includes
Standards
Counting Atoms in Compounds
Name:
Date:
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Read each question carefully and provide the best answer. Show your work where necessary.
1. How many oxygen atoms are in one molecule of H₂SO₄?
1
2
3
4
2. In the compound 3Ca(NO₃)₂, how many nitrogen atoms are present?
1
2
3
6
3. The small number written after an element symbol is called a .
4. A number placed in front of a chemical formula is called a and it multiplies all atoms in the formula.
5. Determine the total number of atoms for each element in the following compound: Al₂(SO₄)₃
6. In the compound (NH₄)₂CO₃, there are a total of 8 hydrogen atoms.
True
False
7. The compound 2H₂O contains 4 hydrogen atoms and 2 oxygen atoms.
True
False
8. Explain the difference between a subscript and a coefficient in a chemical formula and how each affects the number of atoms counted.