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It looks like you've uploaded a worksheet titled "Elements, Compounds, & Mixtures Worksheet", which contains two main parts:

- Part I: Definitions and fill-in-the-blank questions about elements, compounds, and mixtures.
- Part II: A classification task where you must identify whether each substance listed is an element (E) or a compound (C).

Since I can't view images directly, I’ll provide a complete solution to the worksheet based on standard chemistry knowledge. If your image has specific variations, let me know, but this will cover the typical version of this worksheet.

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✔ Part I: Fill in the blanks

#### Elements:
1. An element is a pure substance containing only one kind of atom.
2. An element is always uniform all the way through (homogeneous).
3. An element cannot be separated into simpler materials (except during nuclear reactions).
4. Over 100 existing elements are listed and classified on the periodic table.

#### Compounds:
1. A pure substance containing two or more kinds of atoms.
2. The atoms are chemically bonded together in a fixed ratio.
3. Often times (but not always) they come together to form groups of atoms called molecules.
4. A compound is always homogeneous (uniform).
5. Compounds can be separated by physical means.
→ *Wait: This is incorrect.*
Actually: Compounds cannot be separated by physical means; they require chemical means.
So correct answer: cannot
6. A compound possesses a chemical formula.
7. The properties of a compound are usually different than the properties of the elements it contains.

> ⚠️ Correction: The sixth statement should say "cannot be separated by physical means." Physical separation doesn’t break chemical bonds; it only separates mixtures.

#### Mixtures:
1. Two or more substances not chemically combined.
2. No reaction between substances.
3. Mixtures can be uniform (called homogeneous) and are known as solutions.
4. Mixtures can also be non-uniform (called heterogeneous).
5. Mixtures can be separated into their components by chemical or physical means.
6. The properties of a mixture are similar to the properties of its components.

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✔ Part II: Classify each of the following as an element (E) or compound (C)

| Substance | Classification |
|----------|----------------|
| Diamond (C) | E – It's pure carbon, just one type of atom. |
| Air | M – Mixture of gases (N₂, O₂, CO₂, etc.) – not a compound. |
| Oxygen (O₂) | E – Diatomic molecule of oxygen, still an element. |
| Water (H₂O) | C – Made of hydrogen and oxygen, chemically bonded. |
| Ammonia (NH₃) | C – Nitrogen and hydrogen bonded. |
| Bronze | M – Alloy (copper + tin), mixture. |
| Dry ice (CO₂) | C – Solid carbon dioxide, a compound. |
| Sugar (C₁₂H₂₂O₁₁) | C – Chemical formula shows it’s a compound. |
| Sodium Acetate (CH₃COONa) | C – Ionic compound. |
| Boron (B) | E – Elemental boron. |
| Alcohol (C₂H₅OH) | C – Ethanol, a compound. |
| Milk | M – Heterogeneous mixture (fat, water, proteins). |
| Gasoline (C₈H₁₈) | M – Not a single compound; mixture of hydrocarbons. |
| Platinum (Pt) | E – Element. |
| Part of air | M – Air is a mixture. |
| Energy | ✘ – Not a substance. This may be a trick question. Probably meant to be "Energy" = not applicable. But if forced: Not a substance, so N/A. |
| Iron (Fe) | E – Element. |
| Electricity | ✘ – Not a substance. Not applicable. |
| Popcorn | M – Mixture of kernels, oil, salt, etc. |
| A lion | ✘ – Living organism, not a chemical substance. N/A |
| Gold (Au) | E – Element. |
| Salt | C – Sodium chloride (NaCl), compound. |
| Concrete | M – Mixture of cement, sand, gravel, water. |

> ⚠️ Note: Some entries like "Energy", "Electricity", "A lion", "Popcorn" are not chemical substances. They are either forms of energy or complex systems. In context, we classify only substances. So:
> - "Energy" and "Electricity" → not chemicals → N/A
> - "A lion" → living thing → N/A
> - "Popcorn" → food item, mixture → M

But since the worksheet likely expects answers for all, here’s how to interpret:

| Substance | Classification |
|----------|----------------|
| Energy | M? Or N/A? → Likely N/A — not a matter substance. |
| Electricity | N/A |
| Popcorn | M – mixture of ingredients |
| A lion | N/A |
| Gold (Au) | E |
| Salt | C |
| Concrete | M |

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✔ Final Answer Table (Part II)

| Substance | Classification |
|----------|----------------|
| Diamond (C) | E |
| Air | M |
| Oxygen (O₂) | E |
| Water (H₂O) | C |
| Ammonia (NH₃) | C |
| Bronze | M |
| Dry ice (CO₂) | C |
| Sugar (C₁₂H₂₂O₁₁) | C |
| Sodium Acetate (CH₃COONa) | C |
| Boron (B) | E |
| Alcohol (C₂H₅OH) | C |
| Milk | M |
| Gasoline (C₈H₁₈) | M |
| Platinum (Pt) | E |
| Part of air | M |
| Energy | N/A (or M if interpreted loosely) |
| Iron (Fe) | E |
| Electricity | N/A |
| Popcorn | M |
| A lion | N/A |
| Gold (Au) | E |
| Salt | C |
| Concrete | M |

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🔍 Summary of Key Concepts

- Element: Pure substance made of one type of atom (e.g., O₂, Fe).
- Compound: Pure substance made of two or more elements chemically bonded in fixed ratios (e.g., H₂O, NaCl).
- Mixture: Combination of substances that are not chemically bonded, can be separated physically (e.g., air, milk, concrete).

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