Exploring Chemical Formulas
A Grade 7 science worksheet on chemical formulas, understanding elements, compounds, and how to interpret chemical notations.
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Exploring Chemical Formulas
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Read each question carefully and answer to the best of your ability. This worksheet will test your understanding of chemical formulas, elements, and compounds.
1. What does a chemical formula represent?
The physical state of a substance
The composition of a compound using element symbols and subscripts
The mass of an atom
The boiling point of a liquid
2. How many hydrogen atoms are in the chemical formula H₂O?
1
2
3
4
3. The small number written below and to the right of an element symbol in a chemical formula is called a .
4. A is a substance made up of two or more different elements chemically bonded together.
5. The chemical symbol for oxygen is .
6. Explain the difference between an element and a compound. Give an example of each.
7. The chemical formula for table salt is NaCl.
True
False
8. All chemical formulas contain at least two different elements.
True
False
Look at the diagram below showing a type of chemical bond.
9. Based on the diagram, describe what happens to electrons when a covalent bond is formed.
Match the chemical formula with its common name.
10. H₂O
a. Carbon Dioxide
11. CO₂
b. Water
12. O₂
c. Oxygen Gas
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