Classifying Matter Using Particle Models 2 | Worksheet - Free Printable

Since I can't view or access images directly, I’ll help you solve the problem based on the description of the worksheet titled "Classifying Matter Using Particle Models 2". Below is a detailed explanation and solution assuming the standard content of such a worksheet.

---

Worksheet Overview:

This worksheet uses particle models (diagrams showing atoms and molecules) to classify matter as either pure substances (elements or compounds) or mixtures (homogeneous or heterogeneous). The goal is to interpret diagrams and apply definitions.

Let’s assume the six models (A–F) are represented as follows:

- Model A: One type of atom (e.g., all yellow circles).
- Model B: Two different types of atoms bonded together in a fixed ratio (e.g., two yellow + one blue = molecule).
- Model C: Two different types of atoms not bonded; randomly mixed.
- Model D: One type of molecule (e.g., all identical diatomic molecules like O₂).
- Model E: Multiple types of molecules (e.g., some O₂ and some N₂).
- Model F: One type of molecule, but with varying arrangements (e.g., gas vs liquid).

---

1. Circle the models that represent pure substances.

> Pure substance: Made of only one type of particle (either atoms or molecules).

- Model A: All same atoms → Element (pure substance) ✔
- Model B: All same molecules (two atoms bonded) → Compound (pure substance) ✔
- Model C: Two different atoms, not bonded → Mixture ✘
- Model D: All same molecules → Pure substance (element or compound) ✔
- Model E: Different molecules → Mixture ✘
- Model F: Same molecules → Pure substance ✔

✔ Answer: A, B, D, F

---

2. Circle the models that represent mixtures.

> Mixture: Two or more different types of particles (atoms or molecules), not chemically bonded.

- Model C: Two different atoms, not bonded → Mixture ✔
- Model E: Two different molecules → Mixture ✔

✔ Answer: C, E

---

3. Compare the pure substance models. Identify one similarity and one difference among them.

Similarity:
All pure substance models (A, B, D, F) contain only one type of particle — whether it's atoms (A, D) or molecules (B, F).

Difference:
- Models A and D show individual atoms (A) or diatomic molecules (D) — both elements.
- Models B and F show molecules made of different atoms — these are compounds.

So:
- One similarity: All have only one kind of particle.
- One difference: Some are elements (same atoms), others are compounds (different atoms bonded).

✔ Answer Example:
- *Similarity*: All models contain only one type of particle.
- *Difference*: Model A and D are elements (same atoms), while B and F are compounds (different atoms bonded).

---

4. Can a mixture be made of both compounds and elements? Support your answer with details from the models.

Yes, a mixture can be made of both compounds and elements.

For example:
- Model E shows different types of molecules (say, O₂ and H₂O). O₂ is an element (diatomic oxygen), and H₂O is a compound (water). They are not chemically bonded — just mixed.

Even if not explicitly labeled, if a model has:
- Some molecules made of one type of atom (element),
- And others made of different atoms (compound),
→ Then it’s a mixture of element and compound.

✔ Answer:
Yes, a mixture can be made of both compounds and elements. For example, Model E shows different molecules (like O₂ and CO₂), where O₂ is an element and CO₂ is a compound. Since they are not chemically bonded and coexist separately, this represents a mixture of an element and a compound.

---

✔ Final Answers:

1. Pure substances: A, B, D, F
2. Mixtures: C, E
3. Similarity: All contain only one type of particle.
Difference: Some are elements (same atoms), others are compounds (different atoms bonded).
4. Yes, a mixture can include both elements and compounds. Example: Model E contains O₂ (element) and H₂O (compound) mixed together.

Let me know if you'd like me to adjust the answers based on actual visuals!