Homogeneous or Heterogeneous - Mixtures Practice Worksheet - Free Printable

Mixtures Worksheet Solution

The task is to classify each material as either a mixture or a pure substance, and further classify mixtures as homogeneous or heterogeneous, and pure substances as elements or compounds. Below is the detailed solution:

---

#### 1. Aluminum foil
- Classification: Pure Substance
- Reason: Aluminum foil is made of pure aluminum, which is an element.
- Element or Compound: Element

#### 2. Air
- Classification: Mixture
- Reason: Air is a combination of various gases (e.g., nitrogen, oxygen, carbon dioxide) that are not chemically bonded.
- Homogeneous or Heterogeneous: Homogeneous

#### 3. Soil
- Classification: Mixture
- Reason: Soil contains various components like sand, clay, organic matter, and water, which are not uniformly distributed.
- Homogeneous or Heterogeneous: Heterogeneous

#### 4. Water (H₂O)
- Classification: Pure Substance
- Reason: Water is a compound composed of hydrogen and oxygen atoms in a fixed ratio.
- Element or Compound: Compound

#### 5. Steel
- Classification: Mixture
- Reason: Steel is an alloy of iron with carbon and other elements, making it a mixture.
- Homogeneous or Heterogeneous: Homogeneous

#### 6. Bag of M&M's
- Classification: Mixture
- Reason: A bag of M&M's contains different colors and flavors, which are not uniformly mixed.
- Homogeneous or Heterogeneous: Heterogeneous

#### 7. Sugar
- Classification: Pure Substance
- Reason: Sugar (sucrose) is a compound with a specific chemical formula (C₁₂H₂₂O₁₁).
- Element or Compound: Compound

#### 8. Sugar water
- Classification: Mixture
- Reason: Sugar water is a solution of sugar dissolved in water, where the components are not chemically bonded.
- Homogeneous or Heterogeneous: Homogeneous

#### 9. Pizza
- Classification: Mixture
- Reason: Pizza consists of multiple ingredients (dough, cheese, sauce, toppings) that are not uniformly mixed.
- Homogeneous or Heterogeneous: Heterogeneous

#### 10. Blood
- Classification: Mixture
- Reason: Blood contains cells, plasma, and other components that are not uniformly distributed.
- Homogeneous or Heterogeneous: Heterogeneous

#### 11. Table Salt (NaCl)
- Classification: Pure Substance
- Reason: Table salt is a compound composed of sodium and chlorine atoms in a fixed ratio.
- Element or Compound: Compound

#### 12. Iron Filings
- Classification: Pure Substance
- Reason: Iron filings are made of pure iron, which is an element.
- Element or Compound: Element

#### 13. Gasoline
- Classification: Mixture
- Reason: Gasoline is a complex mixture of hydrocarbons.
- Homogeneous or Heterogeneous: Homogeneous

#### 14. Coffee
- Classification: Mixture
- Reason: Coffee is a solution of coffee beans' extracts in water, along with added ingredients like milk or sugar.
- Homogeneous or Heterogeneous: Homogeneous

#### 15. Orange Juice
- Classification: Mixture
- Reason: Orange juice contains water, sugars, vitamins, and other compounds that are not uniformly distributed.
- Homogeneous or Heterogeneous: Homogeneous

#### 16. Pencil lead
- Classification: Mixture
- Reason: Pencil lead is typically a mixture of graphite and clay.
- Homogeneous or Heterogeneous: Homogeneous

#### 17. Copper
- Classification: Pure Substance
- Reason: Copper is an element.
- Element or Compound: Element

#### 18. Bronze
- Classification: Mixture
- Reason: Bronze is an alloy of copper and tin, making it a mixture.
- Homogeneous or Heterogeneous: Homogeneous

#### 19. Milk and Cereal
- Classification: Mixture
- Reason: Milk and cereal are two distinct substances mixed together.
- Homogeneous or Heterogeneous: Heterogeneous

#### 20. Acetic acid
- Classification: Pure Substance
- Reason: Acetic acid is a compound with a specific chemical formula (CH₃COOH).
- Element or Compound: Compound

---

Final Answer:

| Material | Mixture/Pure Substance | Homogeneous/Heterogeneous | Element/Compound |
|--------------------|------------------------|---------------------------|------------------|
| Aluminum foil | Pure Substance | N/A | Element |
| Air | Mixture | Homogeneous | N/A |
| Soil | Mixture | Heterogeneous | N/A |
| Water (H₂O) | Pure Substance | N/A | Compound |
| Steel | Mixture | Homogeneous | N/A |
| Bag of M&M's | Mixture | Heterogeneous | N/A |
| Sugar | Pure Substance | N/A | Compound |
| Sugar water | Mixture | Homogeneous | N/A |
| Pizza | Mixture | Heterogeneous | N/A |
| Blood | Mixture | Heterogeneous | N/A |
| Table Salt (NaCl) | Pure Substance | N/A | Compound |
| Iron Filings | Pure Substance | N/A | Element |
| Gasoline | Mixture | Homogeneous | N/A |
| Coffee | Mixture | Homogeneous | N/A |
| Orange Juice | Mixture | Homogeneous | N/A |
| Pencil lead | Mixture | Homogeneous | N/A |
| Copper | Pure Substance | N/A | Element |
| Bronze | Mixture | Homogeneous | N/A |
| Milk and Cereal | Mixture | Heterogeneous | N/A |
| Acetic acid | Pure Substance | N/A | Compound |

Boxed Final Answer:
\[
\boxed{
\begin{array}{|c|c|c|c|}
\hline
\text{Material} & \text{Mixture/Pure Substance} & \text{Homogeneous/Heterogeneous} & \text{Element/Compound} \\
\hline
\text{Aluminum foil} & \text{Pure Substance} & \text{N/A} & \text{Element} \\
\hline
\text{Air} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Soil} & \text{Mixture} & \text{Heterogeneous} & \text{N/A} \\
\hline
\text{Water (H₂O)} & \text{Pure Substance} & \text{N/A} & \text{Compound} \\
\hline
\text{Steel} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Bag of M&M's} & \text{Mixture} & \text{Heterogeneous} & \text{N/A} \\
\hline
\text{Sugar} & \text{Pure Substance} & \text{N/A} & \text{Compound} \\
\hline
\text{Sugar water} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Pizza} & \text{Mixture} & \text{Heterogeneous} & \text{N/A} \\
\hline
\text{Blood} & \text{Mixture} & \text{Heterogeneous} & \text{N/A} \\
\hline
\text{Table Salt (NaCl)} & \text{Pure Substance} & \text{N/A} & \text{Compound} \\
\hline
\text{Iron Filings} & \text{Pure Substance} & \text{N/A} & \text{Element} \\
\hline
\text{Gasoline} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Coffee} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Orange Juice} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Pencil lead} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Copper} & \text{Pure Substance} & \text{N/A} & \text{Element} \\
\hline
\text{Bronze} & \text{Mixture} & \text{Homogeneous} & \text{N/A} \\
\hline
\text{Milk and Cereal} & \text{Mixture} & \text{Heterogeneous} & \text{N/A} \\
\hline
\text{Acetic acid} & \text{Pure Substance} & \text{N/A} & \text{Compound} \\
\hline
\end{array}
}
\]