Elements, Compounds, and Mixtures interactive worksheet | Live ... - Free Printable

Let's solve this step by step.

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Part 1: Identify each diagram as an element, compound, or mixture

We analyze the molecular diagrams:

1. Carbon dioxide (CO₂)
- Each molecule has one dark atom (carbon) and two light atoms (oxygen).
- All molecules are identical and composed of two different types of atoms chemically bonded.
→ This is a compound.

2. Oxygen (O₂)
- Each molecule consists of two identical atoms (light gray), forming O₂.
- All molecules are the same and made of only one type of atom.
→ This is an element (specifically a diatomic element).

3. Nitric acid (HNO₃)
- Molecules consist of three different atoms: hydrogen (small), nitrogen (dark), and oxygen (light).
- All molecules are identical and chemically bonded in the same way.
→ This is a compound.

4. Hydrochloric acid (HCl)
- Each molecule has one small atom (hydrogen) and one larger atom (chlorine).
- All molecules are identical and made of two different elements chemically bonded.
→ This is a compound.

5. Nitrogen (N₂)
- Each molecule has two identical dark atoms, forming N₂.
- All molecules are the same and made of one type of atom.
→ This is an element.

6. Air
- Shows different types of molecules: some with two atoms (like O₂ or N₂), others with different combinations.
- There is no uniform composition — multiple substances present.
→ This is a mixture (specifically a homogeneous mixture of gases).

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✔ Answers for Part 1:
1. Compound
2. Element
3. Compound
4. Compound
5. Element
6. Mixture

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Part 2: State whether each substance is an element, compound, or mixture

| Substance | Chemical Formula | Classification |
|-------------------|-----------------------|----------------------|
| Oxygen | O₂ | Element |
| Sulfuric Acid | H₂SO₄ | Compound |
| Salt Water | NaCl + H₂O | Mixture |
| Magnesium Oxide | MgO | Compound |
| Gun Powder | S + KNO₃ + C | Mixture |
| Nitrogen | N₂ | Element |

#### Explanation:
- Element: Made of only one type of atom (e.g., O₂, N₂).
- Compound: Two or more elements chemically bonded in fixed ratio (e.g., H₂SO₄, MgO).
- Mixture: Two or more substances physically combined, not chemically bonded (e.g., salt water = NaCl dissolved in H₂O; gun powder = physical mix of sulfur, potassium nitrate, and carbon).

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✔ Final Answers:

#### Part 1: Diagrams
1. Compound
2. Element
3. Compound
4. Compound
5. Element
6. Mixture

#### Part 2: Table
| Substance | Chemical Formula | Element, Compound, Mixture |
|-------------------|-----------------------|----------------------------|
| Oxygen | O₂ | Element |
| Sulfuric Acid | H₂SO₄ | Compound |
| Salt Water | NaCl + H₂O | Mixture |
| Magnesium Oxide | MgO | Compound |
| Gun Powder | S + KNO₃ + C | Mixture |
| Nitrogen | N₂ | Element |

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