Worksheet on solubility and dissolution processes, featuring true/false questions and a diagram of a beaker with a solid at the bottom.

Part 1: True/False Questions with Corrections

#### 1. Stirring a solution will make the solute dissolve slower.
- Answer: False
- Correction: Stirring a solution will make the solute dissolve faster.

#### Explanation:
Stirring increases the rate of dissolution by bringing fresh solvent into contact with the undissolved solute particles, thus accelerating the process.

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#### 2. As the temperature of a liquid increases, the rate at which a solid solute dissolves decreases.
- Answer: False
- Correction: As the temperature of a liquid increases, the rate at which a solid solute dissolves increases.

#### Explanation:
Higher temperatures increase the kinetic energy of both the solute and solvent molecules, leading to more frequent and effective collisions that facilitate dissolution.

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#### 3. As the size of solute particles increases, the rate at which the solute dissolves increases.
- Answer: False
- Correction: As the size of solute particles decreases, the rate at which the solute dissolves increases.

#### Explanation:
Smaller solute particles have a larger surface area exposed to the solvent, allowing for faster dissolution. Larger particles have less surface area per unit mass, so they dissolve more slowly.

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#### 4. Solutions form when a solute dissolves in a solvent.
- Answer: True

#### Explanation:
A solution is formed when a solute (the substance being dissolved) is uniformly distributed in a solvent (the substance doing the dissolving). This statement is correct as it accurately describes the process of solution formation.

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#### 5. Heat causes molecules on sugar to leave a sugar cube more rapidly when placed in a solution.
- Answer: True

#### Explanation:
Heat increases the kinetic energy of the sugar molecules, causing them to move more rapidly and break away from the sugar cube more quickly. This accelerates the dissolution process.

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#### 6. The rate at which a solid solute dissolves can be changed.
- Answer: True

#### Explanation:
The rate of dissolution can be altered by changing factors such as temperature, stirring, particle size, and concentration gradients. This statement is correct.

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#### 7. The larger the size of solute particles, the faster the solute dissolves.
- Answer: False
- Correction: The smaller the size of solute particles, the faster the solute dissolves.

#### Explanation:
Smaller particles have a greater surface area relative to their volume, allowing them to dissolve more quickly. Larger particles have less surface area per unit mass, so they dissolve more slowly.

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#### 8. A sugar cube dissolves faster in a glass of cold water than in a glass of hot water.
- Answer: False
- Correction: A sugar cube dissolves slower in a glass of cold water than in a glass of hot water.

#### Explanation:
Hot water has higher kinetic energy, which speeds up the movement of both the sugar molecules and the water molecules, facilitating faster dissolution. Cold water has lower kinetic energy, so the dissolution process is slower.

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#### 9. If you put a sugar cube in a glass of water and do not stir it, some of the sugar will dissolve.
- Answer: True

#### Explanation:
Even without stirring, diffusion will cause some sugar molecules to dissolve into the water over time. However, the rate of dissolution will be much slower compared to if the solution were stirred.

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#### 10. A cool solvent dissolves less solute than an equal amount of warm solvent.
- Answer: True

#### Explanation:
Cooler solvents generally have lower kinetic energy, which reduces the rate and extent of solute dissolution compared to warmer solvents. This statement is correct.

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Part 2: Beaker Analysis Questions

#### 1. Is the solid at the bottom of the beaker completely dissolved? (yes/no)
- Answer: No

#### Explanation:
The image shows a beaker with a solid at the bottom, indicating that not all of the solute has dissolved. Some solid remains undissolved, suggesting that the solution may be saturated or that the dissolution process is incomplete.

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#### 2. What would happen if the beaker and its contents were heated?
- Answer: It would dissolve faster.

#### Explanation:
Heating the beaker would increase the kinetic energy of both the solute and solvent molecules. This would lead to more frequent and effective collisions, accelerating the dissolution process.

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#### 3. Why would stirring the water cause the solute to dissolve faster? Stirring would bring fresh solvent in contact with the particles. This would have no effect/increase the rate of dissolving/decrease the rate of dissolving.
- Answer: Increase the rate of dissolving.

#### Explanation:
Stirring brings fresh solvent into contact with the undissolved solute particles, reducing the concentration gradient near the solid surface. This promotes faster dissolution by ensuring that the solute is continuously exposed to fresh solvent.

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#### 4. What effect would crushing the solute have on the rate at which it dissolves? (not change/decrease the rate of dissolving/increase the rate of dissolving)
- Answer: Increase the rate of dissolving.

#### Explanation:
Crushing the solute increases its surface area, exposing more solute particles to the solvent. This leads to a higher rate of dissolution because there are more opportunities for the solvent molecules to interact with the solute.

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Final Answers:

1. False (faster)
2. False (increases)
3. False (decreases)
4. True
5. True
6. True
7. False (smaller)
8. False (slower)
9. True
10. True

Beaker Analysis:
1. No
2. It would dissolve faster.
3. Increase the rate of dissolving.
4. Increase the rate of dissolving.

Final Boxed Answer:
\[
\boxed{
\text{1. False (faster), 2. False (increases), 3. False (decreases), 4. True, 5. True, 6. True, 7. False (smaller), 8. False (slower), 9. True, 10. True}
}
\]