🔬 Part 1: Understanding Atoms and Molecules

1. Circle the best definition of an atom:

The smallest particle of matter that still has the properties of an element

A large group of particles stuck together

Something you can see with your eyes

A type of cell in your body

2. What is a molecule? Write your answer in complete sentences.

3. Fill in the blanks:

Everything around us is made of tiny particles called _______________. When two or more atoms join together, they form a _______________. Water is made of _______________ atoms and _______________ atoms.

4. Check all the examples that are molecules:

Water (H₂O)

Carbon dioxide (CO₂)

A single oxygen atom

Salt (NaCl)

✏️ Part 2: Writing About Atoms and Molecules

5. Imagine you could shrink down to the size of an atom. Write a paragraph describing what you might see and experience in this tiny world. Use at least 4 complete sentences.

6. Explain why atoms are important to understanding matter. Write 2-3 sentences.

7. Compare and contrast atoms and molecules. How are they similar? How are they different?

🎯 Part 3: Real-World Connections

8. Think about the air you breathe. Describe what molecules are in air and explain why understanding atoms and molecules helps us understand breathing. Write at least 3 sentences.

9. Create an analogy: If atoms were like _________________, then molecules would be like _________________. Explain your comparison in 1-2 sentences.