Counting Atoms in Compounds
A Grade 8 science worksheet focused on understanding and counting atoms in various chemical compounds, aligning with fundamental chemistry principles.
Includes
Standards
Topics
Counting Atoms in Compounds
Name:
Date:
Score:
Read each question carefully and follow the instructions to count the atoms in the given chemical compounds. Remember to pay attention to subscripts and coefficients.
1. The small number written after an element symbol in a chemical formula is called a .
2. A large number written in front of a chemical formula is called a and it multiplies all the atoms in the formula.
3. If there is no subscript written after an element, it means there is only atom of that element.
1. How many oxygen atoms are in the compound H₂O?
1
2
3
4
2. What is the total number of atoms in one molecule of CO₂?
1
2
3
4
Count the number of each type of atom in the following compounds:
1. NaCl (Sodium Chloride)
Sodium atoms:
Chlorine atoms:
2. H₂SO₄ (Sulfuric Acid)
Hydrogen atoms:
Sulfur atoms:
Oxygen atoms:
3. 2H₂O (Two molecules of Water)
Hydrogen atoms:
Oxygen atoms:
1. The chemical formula for carbon dioxide is CO.
True
False
2. A coefficient of '3' in front of a chemical formula means there are 3 molecules of that compound.
True
False
Determine the total number of atoms for each element in 3Ca(NO₃)₂. Show your work.
Related Worksheets
Chemical Names and Formulas Worksheet
A Grade 8 science worksheet covering chemical names, formulas, and basic bonding concepts.
Grade 8 Physical Properties Worksheet
Explore the physical properties of matter, including states of matter, density, melting point, and solubility, with this Grade 8 science worksheet.
Lewis Dot Diagram Worksheet
Explore the basics of Lewis dot diagrams, valence electrons, and chemical bonding for Grade 8 science students.
Atomic Models Worksheet
Explore the history and development of atomic models, from Dalton to Bohr, with this engaging Grade 8 science worksheet.
Ions and Formula Units Worksheet
Explore the basics of ions, cations, anions, and how they combine to form neutral ionic compounds and formula units.
Grade 8 Science: Physical Properties
This worksheet covers key concepts of physical properties for Grade 8 science students, including identification, examples, and distinctions from chemical properties.
Chemistry Lab Safety Worksheet
A worksheet covering essential chemistry lab safety rules and practices for 8th-grade science students.
Grade 8 Science: Classification and Changes
This worksheet covers classification of matter, physical and chemical changes, and states of matter for Grade 8 science.