Atoms Elements and Compounds Worksheet 2 - KS3 Chemistry Name ... - Free Printable

Since the image you've uploaded is a worksheet titled "KS3 Chemistry: Worksheet Two – What are compounds?", and it contains diagrams labeled A through F, each showing different arrangements of atoms (represented by circles of various colors and patterns), the task likely involves identifying which diagrams represent elements, compounds, or mixtures.

Let’s analyze each diagram based on the definitions:

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🔬 Key Definitions:

- Element: A substance made of only one type of atom.
- Compound: A substance made of two or more different types of atoms chemically bonded together in a fixed ratio.
- Mixture: A combination of two or more substances that are not chemically bonded and can be separated physically.

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Now let's examine each diagram:

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#### 🔹 Diagram A
- Contains black and white circles (atoms) not bonded together.
- They are randomly scattered.
- This shows two different types of atoms present but not chemically bonded.

✔ This is a mixture (of two elements).

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#### 🔹 Diagram B
- Shows pairs of one white and one black circle bonded together.
- All molecules are identical (same pattern).
- Only one type of molecule present.

✔ This is a compound (e.g., like H₂O if white = O, black = H, but here it's 1:1 ratio — could be CO or similar).

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#### 🔹 Diagram C
- Shows pairs of one white and one dotted circle bonded together.
- All molecules are identical.

✔ This is a compound (different from B; another type of molecule).

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#### 🔹 Diagram D
- Shows pairs of black circles bonded together.
- All particles are identical and consist of two same atoms.

✔ This is an element (diatomic molecule — e.g., O₂ or N₂).

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#### 🔹 Diagram E
- Contains two types of molecules:
- One type: white + black (like in B)
- Another type: white + dotted (like in C)
- These are chemically bonded but not the same.
- So we have two different compounds.

✔ This is a mixture of two compounds.

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#### 🔹 Diagram F
- Contains only black circles (all identical).
- No bonding shown — just individual atoms.

✔ This is an element (a sample of atoms of one element).

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✔ Summary Table:

| Diagram | Type | Reason |
|--------|--------------------|--------|
| A | Mixture | Two types of unbound atoms |
| B | Compound | Same molecule with two different atoms bonded |
| C | Compound | Same molecule with two different atoms bonded |
| D | Element (diatomic) | Same atoms bonded in pairs |
| E | Mixture of compounds | Two different types of molecules |
| F | Element | Single type of atom |

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📝 Likely Questions (based on typical KS3 worksheets):

> 1. Which diagram shows a compound?
> → B and C

> 2. Which diagram shows an element?
> → D and F

> 3. Which diagram shows a mixture?
> → A and E

> 4. Why is a compound not a mixture?
> → Because in a compound, atoms are chemically bonded in a fixed ratio and cannot be separated by physical means. In a mixture, substances are not chemically bonded and can be separated easily.

> 5. Describe the difference between a compound and a mixture using examples from the diagrams.
> → Example: Diagram B is a compound because all molecules are the same and made of two different atoms bonded together. Diagram A is a mixture because there are two separate types of atoms, not bonded to each other.

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If you have specific questions from the "overleaf" page (which isn't visible), feel free to share them, and I’ll help answer them too!