S C 7 1 - Mixtures Worksheet and KEY | PDF | Solution | Mixture - Free Printable

Problem Overview:

The worksheet asks you to classify mixtures into two categories: homogeneous or heterogeneous, and then further classify homogeneous mixtures as either solutions or colloids. Below is a detailed explanation and solution for each part.

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Part 1: Classifying Mixtures as Homogeneous or Heterogeneous

#### Definitions:
- Homogeneous Mixture: A mixture that has a uniform composition throughout. The components are evenly distributed, and the mixture appears the same everywhere.
- Heterogeneous Mixture: A mixture that has a non-uniform composition. The components are not evenly distributed, and different regions of the mixture can have different properties.

#### Classification:
1. a. Beef stew:
- Beef stew contains various ingredients like meat, vegetables, and broth, which are not uniformly distributed.
- Classification: Heterogeneous

2. b. Dry air:
- Dry air is a mixture of gases (e.g., nitrogen, oxygen, carbon dioxide) that are uniformly distributed.
- Classification: Homogeneous

3. c. Granola bar:
- Granola bars contain nuts, oats, and other ingredients that are not evenly distributed.
- Classification: Heterogeneous

4. d. Brass:
- Brass is an alloy of copper and zinc, which are uniformly mixed at the atomic level.
- Classification: Homogeneous

5. e. Natural gas:
- Natural gas is primarily composed of methane and other gases, which are uniformly distributed.
- Classification: Homogeneous

6. f. Ocean water:
- Ocean water is a mixture of water, dissolved salts, and other substances, which are uniformly distributed.
- Classification: Homogeneous

7. g. Forest soil:
- Forest soil contains sand, clay, organic matter, and other particles that are not evenly distributed.
- Classification: Heterogeneous

8. h. Lemonade:
- Lemonade is a mixture of water, sugar, lemon juice, and other ingredients that are uniformly distributed.
- Classification: Homogeneous

9. i. Olive oil:
- Olive oil is a single substance (not a mixture), but if we consider it as a mixture with minor impurities, it is still uniformly distributed.
- Classification: Homogeneous

10. j. Fizzing soda pop:
- Fizzing soda pop contains carbonated water, sugar, flavorings, and other ingredients that are uniformly distributed.
- Classification: Homogeneous

11. k. Salsa:
- Salsa contains tomatoes, onions, peppers, and other ingredients that are not evenly distributed.
- Classification: Heterogeneous

12. l. White cider vinegar:
- White cider vinegar is a mixture of acetic acid, water, and other substances that are uniformly distributed.
- Classification: Homogeneous

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Part 2: Classifying Homogeneous Mixtures as Solutions or Colloids

#### Definitions:
- Solution: A homogeneous mixture where the solute particles are dissolved in the solvent and are very small (typically less than 1 nm). Examples include saltwater and sugar water.
- Colloid: A homogeneous mixture where the dispersed particles are larger than those in a solution (typically between 1 nm and 1 μm) but smaller than those in a suspension. Examples include fog, milk, and mayonnaise.

#### Classification:
1. a. Spring water:
- Spring water is a mixture of water and dissolved minerals, which are very small particles.
- Classification: Solution

2. b. Homogenized milk:
- Homogenized milk contains fat droplets that are larger than those in a solution but smaller than those in a suspension.
- Classification: Colloid

3. c. Fog:
- Fog consists of tiny water droplets suspended in air, which are larger than solution particles but smaller than suspension particles.
- Classification: Colloid

4. d. Stainless steel:
- Stainless steel is an alloy of iron, chromium, and other metals, which are uniformly mixed at the atomic level. It is not a colloid or solution in the traditional sense but is considered a solid solution.
- Classification: Solution (solid solution)

5. e. Dessert gelatin:
- Gelatin is a mixture where the gelatin molecules are dispersed in water, forming a semi-solid structure. The particles are larger than those in a solution.
- Classification: Colloid

6. f. Cheddar cheese:
- Cheddar cheese contains protein and fat particles that are larger than those in a solution but smaller than those in a suspension.
- Classification: Colloid

7. g. Sugar water:
- Sugar water is a mixture where sugar molecules are dissolved in water, forming very small particles.
- Classification: Solution

8. h. Gasoline:
- Gasoline is a liquid mixture of hydrocarbons that are uniformly distributed.
- Classification: Solution

9. i. Mayonnaise:
- Mayonnaise contains oil droplets dispersed in water, which are larger than solution particles but smaller than suspension particles.
- Classification: Colloid

10. j. Clear apple juice:
- Clear apple juice is a mixture of water, sugars, and other dissolved substances, which are very small particles.
- Classification: Solution

11. k. Shaving cream:
- Shaving cream contains tiny air bubbles dispersed in a liquid, which are larger than solution particles but smaller than suspension particles.
- Classification: Colloid

12. l. Rubbing alcohol:
- Rubbing alcohol is a mixture of ethanol and water, which are uniformly distributed.
- Classification: Solution

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Final Answer:

#### Part 1: Homogeneous or Heterogeneous
1. a. Beef stew: Heterogeneous
2. b. Dry air: Homogeneous
3. c. Granola bar: Heterogeneous
4. d. Brass: Homogeneous
5. e. Natural gas: Homogeneous
6. f. Ocean water: Homogeneous
7. g. Forest soil: Heterogeneous
8. h. Lemonade: Homogeneous
9. i. Olive oil: Homogeneous
10. j. Fizzing soda pop: Homogeneous
11. k. Salsa: Heterogeneous
12. l. White cider vinegar: Homogeneous

#### Part 2: Solutions or Colloids
1. a. Spring water: Solution
2. b. Homogenized milk: Colloid
3. c. Fog: Colloid
4. d. Stainless steel: Solution
5. e. Dessert gelatin: Colloid
6. f. Cheddar cheese: Colloid
7. g. Sugar water: Solution
8. h. Gasoline: Solution
9. i. Mayonnaise: Colloid
10. j. Clear apple juice: Solution
11. k. Shaving cream: Colloid
12. l. Rubbing alcohol: Solution

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Boxed Final Answer:

\[
\boxed{
\text{See classifications above.}
}
\]