Atoms, Elements, Compounds & Mixtures

Name:

Date:

🔬 Part 1: Understanding Atoms and Chemical Symbols

1. What are the three main particles found in an atom?

Protons, neutrons, electrons

Protons, electrons, ions

Neutrons, electrons, molecules

Protons, neutrons, compounds

2. Which particle determines what element an atom is?

Neutrons

Electrons

Protons

All particles equally

3. Match the chemical symbols to their elements:

H = _____________ O = _____________ C = _____________

Na = _____________ Cl = _____________ Ca = _____________

4. Which of these are chemical formulae? (Tick all that apply)

H₂O

CO₂

Salt water

NaCl

⚗️ Part 2: Elements, Compounds and Mixtures

5. Complete the definitions:

Element: A substance made of only _______ type of atom.

Compound: Two or more different elements _____________ bonded together.

Mixture: Two or more substances _____________ mixed together, not chemically bonded.

6. Sort these substances into the correct category:

Oxygen gas (O₂), Salt water, Carbon dioxide (CO₂), Iron (Fe), Air, Water (H₂O)

Elements: _________________________________________________

Compounds: _________________________________________________

Mixtures: _________________________________________________

7. Explain why mixtures can be separated physically but compounds cannot:

8. Give one example of how you could separate a mixture of salt and water:

🚀 Extension Challenge

9. Research Challenge: Name a compound you use in everyday life and write its formula. Explain what elements it contains.

Compound name: _________________________________

Formula: _________________________________

Elements it contains: _________________________________

10. Critical Thinking: Why is it important that scientists use chemical symbols and formulae instead of just writing out the names?

Atoms Elements Compounds Mixtures

Atoms, Elements, Compounds & Mixtures

🔬 Part 1: Understanding Atoms and Chemical Symbols

⚗️ Part 2: Elements, Compounds and Mixtures

🚀 Extension Challenge

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