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Classifying Matter by Atoms
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Classifying Matter by Atoms
📚 Part 1: Multiple Choice
1. Which of the following is an element?
Water (H₂O)
Oxygen (O₂)
Salt water
Carbon dioxide (CO₂)
2. A compound differs from a mixture because compounds:
Can be separated by physical means
Are chemically bonded and have a fixed ratio
Contain only one type of atom
Always exist as gases
3. Which statement about atomic arrangement is correct?
Elements contain different types of atoms
Mixtures have atoms chemically bonded together
Compounds contain atoms of different elements bonded together
All matter has the same atomic arrangement
4. Select all examples of mixtures:
Trail mix
Pure gold
Air
Table salt (NaCl)
Chocolate chip cookies
🔬 Part 2: Classification Activity
5. Classify each example below. Write E for Element, C for Compound, or M for Mixture in the blank.
_____ Aluminum foil
_____ Baking soda (NaHCO₃)
_____ Fruit salad
_____ Helium gas
_____ Sugar (C₆H₁₂O₆)
_____ Sand and water
_____ Iron nail
_____ Milk
6. Explain the difference between a physical combination and a chemical combination in terms of atomic arrangement:
7. Why can mixtures be separated by physical means, but compounds cannot?
✏️ Part 3: Applied Understanding
8. A student finds a sample that contains only carbon atoms. What type of matter is this, and how do you know?
9. Compare the atomic arrangement in salt water versus table salt (NaCl). Explain why one is a mixture and the other is a compound:
10. Create your own example of an element, compound, and mixture. Explain the atomic arrangement in each:
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