Introduction to Molecules
This worksheet introduces 7th-grade students to the basic concepts of molecules, including their composition and examples of common molecules.
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Introduction to Molecules
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Read each question carefully and answer to the best of your ability. Good luck!
1. What is the smallest unit of a chemical compound that retains its chemical properties?
Atom
Molecule
Electron
Proton
2. Which of the following is a molecule made up of two hydrogen atoms and one oxygen atom?
Carbon Dioxide
Oxygen Gas
Water
Nitrogen Gas
3. A molecule is formed when two or more atoms are chemically together.
4. The chemical formula for water is .
5. What is the difference between an atom and a molecule?
6. All molecules are made up of only one type of atom.
True
False
7. Look at the image below of a water molecule and answer the question.
What do the red and white spheres represent in the water molecule diagram?
Use the words below to complete the sentences.
8. A molecule is formed when two or more join together.
9. Water is an example of a because it contains more than one type of atom.
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