Classify atoms, molecules, elements, and compounds worksheet ... - Free Printable

It looks like you've uploaded an image containing a series of diagrams (numbered 9 through 16) that represent different types of matter at the atomic or molecular level. These are likely part of a chemistry worksheet designed to help identify whether each diagram represents an element, compound, mixture, or pure substance.

Let’s analyze each one based on standard scientific classification:

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Key Definitions:

- Element: Made of only one type of atom.
- Compound: Made of two or more different atoms chemically bonded in a fixed ratio.
- Mixture: Two or more substances physically combined (not chemically bonded), can be homogeneous or heterogeneous.
- Pure Substance: Either an element or a compound — has uniform composition and distinct chemical properties.

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Now, let's go through each diagram:

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9)

- Shows green and orange spheres in pairs (each pair consists of one green and one orange).
- All pairs are identical → same molecule.
- Since they are chemically bonded in a consistent way (one green + one orange), this is a compound.
- ✔ Answer: Compound

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10)

- Shows multiple identical dark green spheres.
- All are the same type of atom, no bonding shown.
- This is a collection of atoms of one element → element.
- ✔ Answer: Element

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11)

- Shows molecules made of one black sphere and four red spheres.
- Each molecule has the same arrangement → consistent formula (like CH₄, methane).
- Different atoms chemically bonded → compound.
- ✔ Answer: Compound

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12)

- One large green sphere with two smaller red spheres attached.
- A single molecule made of two different elements (green + red).
- Bonded together → compound.
- ✔ Answer: Compound

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13)

- Multiple identical orange spheres scattered around.
- No bonding visible; all are the same type of atom.
- Represents individual atoms of one element → element.
- ✔ Answer: Element

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14)

- A single large yellow sphere.
- Likely represents a single atom (or a large particle).
- Only one type of particle → element (if it's an atom) or possibly a pure substance.
- But since it's just one atom and not showing multiple atoms, it could be interpreted as a representation of an atom of an element.
- In context, this is typically used to represent a single atom of an element.
- ✔ Answer: Element

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15)

- Two types of molecules:
- One molecule: one gray + one white
- Another molecule: same combination but orientation may differ
- But both are the same kind of molecule (gray-white)
- So, all particles are identical molecules → compound
- However, if there were different types of molecules, it would be a mixture.
- Here, all are same molecule → compound
- ✔ Answer: Compound

> Wait — actually, upon closer inspection, there are two molecules shown, both composed of one gray and one white atom → same formula → compound.

But note: If the diagram shows only one type of molecule, then it's a compound.

✔ Answer: Compound

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16)

- Several identical black spheres.
- All are the same → same type of atom.
- Not bonded → free atoms.
- Represents an element in atomic form (e.g., noble gas).
- ✔ Answer: Element

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Summary Table:

| Number | Diagram Description | Classification |
|--------|----------------------------------------------------|----------------|
| 9 | Pairs of green + orange atoms | Compound |
| 10 | Multiple identical dark green atoms | Element |
| 11 | Molecules of black + four red atoms | Compound |
| 12 | One green + two red atoms (molecule) | Compound |
| 13 | Multiple identical orange atoms | Element |
| 14 | Single large yellow sphere | Element |
| 15 | Two identical molecules (gray + white) | Compound |
| 16 | Multiple identical black atoms | Element |

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Final Answers:

9) Compound
10) Element
11) Compound
12) Compound
13) Element
14) Element
15) Compound
16) Element

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If your task was to classify these as element, compound, or mixture, then the above answers are correct.

Let me know if you'd like this explained further or formatted for a worksheet!