Interactive Science Worksheet for 9-Year-Olds: Atoms, Molecules, and States of Matter

Instructions

Read each question carefully and choose the correct answer. Write the letter of the correct answer in the space provided.

1. What is the smallest unit of matter?

• A) Cell
• B) Atom
• C) Molecule
• D) Element

2. Which of the following is a type of molecule?

• A) H2O (Water)
• B) Na (Sodium)
• C) O2 (Oxygen)
• D) Both A and C

3. What are the three main states of matter?

• A) Solid, Liquid, Gas
• B) Ice, Water, Steam
• C) Hard, Soft, Gas
• D) All of the above

4. What happens to the particles in a solid when it is heated?

5. Name one example of a gas.

6. Describe what a molecule is in your own words.

7. Can you think of something in your home that is a solid, liquid, and gas? List them below.