Diagrams illustrating types of matter: pure element, mixture of elements, pure compound, mixture of compounds, and mixture of compound and element.

You’ve uploaded an image that contains Part 3 (microscopic diagrams of particles) and Part 4 (classification of real-world substances). I’ll solve both parts step by step.

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## ✔ PART 3: Match the diagrams (A–E) to the descriptions (1–5)

We are given 5 particle diagrams and 5 definitions. We need to match each diagram to the correct description based on what kind of particles (atoms or molecules) are present and whether they are mixed or pure.

Definitions:

1. Pure Element – only one type of atom present → All particles are identical single atoms.
2. Mixture of two elements – two types of uncombined atoms present → Two different kinds of single atoms, not bonded.
3. Pure compound – only one type of compound present → All particles are identical molecules made of different atoms bonded together.
4. Mixture of two compounds – two types of compounds present → Two different kinds of molecules (each made of bonded atoms).
5. Mixture of a compound and an element – one type of compound + one type of uncombined atom.

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Analyze each diagram:

#### ➤ Diagram A:
- Contains two types of molecules:
- One is a molecule with 3 atoms in a line (○●○)
- Another is a molecule with 2 atoms (●○)
- So, two different compounds → Match #4

#### ➤ Diagram B:
- Contains only one type of molecule: ○●○ (same shape and composition throughout)
- So, pure compound → Match #3

#### ➤ Diagram C:
- Contains only single atoms, all identical (all ○)
- So, pure element → Match #1

#### ➤ Diagram D:
- Contains two types of particles:
- Single atoms (○)
- Molecules (●○ — a compound)
- So, mixture of a compound and an element → Match #5

#### ➤ Diagram E:
- Contains two types of single atoms: ○ and ● (not bonded)
- So, mixture of two elements → Match #2

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✔ Final Matching for Part 3:

| Diagram | Match |
|---------|-------|
| A | 4 |
| B | 3 |
| C | 1 |
| D | 5 |
| E | 2 |

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## ✔ PART 4: Classify each substance as Pure Substance or Mixture, then further classify

We need to determine:
- Is it a Pure Substance (element or compound) or a Mixture?
- If mixture: is it homogeneous (uniform) or heterogeneous (non-uniform)?
- If pure substance: is it an element or a compound?

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1. Chocolate syrup is added to milk and stirred

- Mixture (chocolate syrup + milk = two substances)
- Stirred → likely uniform → Homogeneous mixture (solution)
✔ *Already filled correctly*

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2. Copper metal (used to make wires)

- Pure copper = one type of atom → Element
- So, Pure Substance → Element

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3. Sand is added to water

- Sand doesn’t dissolve → visible particles → Heterogeneous mixture

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4. Distilled water

- H₂O only → pure compound → Pure Substance → Compound

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5. Tap water

- Contains dissolved minerals, chlorine, etc. → Mixture
- Uniform appearance → Homogeneous mixture (solution)

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6. Helium gas (used to inflate a balloon)

- Pure helium atoms → Element
- Pure Substance → Element

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7. Table sugar

- Sucrose (C₁₂H₂₂O₁₁) → pure compound → Pure Substance → Compound

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8. Table sugar added to a cup of coffee and stirred

- Sugar dissolves → uniform → Homogeneous mixture (solution)

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9. The air we breathe

- Mixture of N₂, O₂, CO₂, Ar, etc. → Mixture
- Uniformly mixed → Homogeneous mixture (gas mixture)

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✔ Final Answers for Part 4:

| Description | Pure Substance or Mixture? | Classification? |
|--------------------------------------------------|-----------------------------|-------------------------------------|
| 1. Chocolate syrup + milk | Mixture | Homogeneous mixture (solution) |
| 2. Copper metal | Pure Substance | Element |
| 3. Sand + water | Mixture | Heterogeneous mixture |
| 4. Distilled water | Pure Substance | Compound |
| 5. Tap water | Mixture | Homogeneous mixture (solution) |
| 6. Helium gas | Pure Substance | Element |
| 7. Table sugar | Pure Substance | Compound |
| 8. Sugar + coffee | Mixture | Homogeneous mixture (solution) |
| 9. Air we breathe | Mixture | Homogeneous mixture (gas mixture) |

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## 🎯 Summary

- Part 3 Matching: A→4, B→3, C→1, D→5, E→2
- Part 4 Classification: Completed as above.

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