Comprehension Passage for Evaporation Worksheets - Free Printable

Problem Explanation:

The image provided is an educational text about evaporation, a process where water changes from a liquid to a gas (water vapor). The text explains the concept of evaporation and poses several questions related to it. Below, I will solve each question step by step.

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Questions and Solutions:

#### 1. What is the process called when a liquid changes to a gas?
- Answer: The process is called evaporation.
- Explanation: Evaporation is the transformation of a liquid into a gaseous state (vapor) at temperatures below its boiling point. This occurs when water molecules gain enough energy to break free from the liquid's surface and enter the atmosphere as water vapor.

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#### 2. Why does it look like water just disappears from a puddle?
- Answer: Water doesn't actually "disappear"; it evaporates into the air as water vapor.
- Explanation: When you see a puddle shrinking or disappearing, what's happening is that the water molecules on the surface are gaining energy (usually from the sun or ambient heat) and turning into water vapor. This vapor rises into the air, making it seem like the water has disappeared.

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#### 3. In your own words, describe what evaporation is.
- Answer: Evaporation is the process where liquid water turns into water vapor and enters the atmosphere. It happens when water molecules on the surface of a liquid gain enough energy to break free from the liquid and move into the air as a gas.
- Explanation: Evaporation is a natural process driven by heat. As water molecules absorb energy (e.g., from sunlight or warm air), some of them gain enough kinetic energy to escape the liquid's surface and become part of the surrounding air as water vapor.

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#### 4. What causes evaporation to happen?
- Answer: Evaporation is caused by the transfer of energy (heat) to water molecules. This energy allows the molecules to overcome the forces holding them in the liquid state and transition into a gaseous state.
- Explanation: The primary cause of evaporation is heat. When water absorbs heat from the environment (e.g., sunlight, warm air, or other sources), the water molecules gain kinetic energy. This increased energy allows the molecules to move faster and eventually break free from the liquid's surface, entering the air as water vapor.

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#### 5. When a kettle produces steam from boiling, what is that process called?
- Answer: The process is called boiling.
- Explanation: Boiling is different from evaporation. While evaporation occurs at the surface of a liquid at any temperature, boiling happens when the entire liquid reaches its boiling point (100°C at sea level for water) and bubbles of vapor form throughout the liquid. The steam produced during boiling is water vapor generated from the entire volume of the liquid, not just the surface.

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#### 6. What causes water to evaporate more quickly?
- Answer: Several factors can cause water to evaporate more quickly:
1. Higher temperature: Warmer temperatures provide more energy to water molecules, allowing them to evaporate faster.
2. Lower humidity: If the surrounding air is dry (low humidity), it can absorb more water vapor, increasing the rate of evaporation.
3. Increased surface area: A larger surface area exposes more water molecules to the air, allowing more evaporation to occur.
4. Wind or airflow: Moving air helps carry away the water vapor, reducing the concentration of vapor near the liquid and allowing more evaporation to take place.
5. Lower atmospheric pressure: At lower pressures, water molecules require less energy to escape into the air, speeding up evaporation.

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Final Answer Summary:

1. The process is called evaporation.
2. Water looks like it disappears because it evaporates into water vapor.
3. Evaporation is the process where liquid water turns into water vapor and enters the atmosphere due to the energy absorbed by water molecules.
4. Evaporation is caused by the transfer of energy (heat) to water molecules.
5. The process when a kettle produces steam from boiling is called boiling.
6. Factors that cause water to evaporate more quickly include higher temperature, lower humidity, increased surface area, wind or airflow, and lower atmospheric pressure.

Boxed Final Answer:
\[
\boxed{
\begin{aligned}
1. & \text{ Evaporation} \\
2. & \text{ Water evaporates into water vapor.} \\
3. & \text{ Evaporation is the process where liquid water turns into water vapor and enters the atmosphere.} \\
4. & \text{ Heat (energy transfer to water molecules).} \\
5. & \text{ Boiling} \\
6. & \text{ Higher temperature, lower humidity, increased surface area, wind, lower atmospheric pressure.}
\end{aligned}
}
\]