Changing State - Condensation. Objective: Describe on the molecular level how cooling water vapor causes condensation.

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Presentation transcript:

Changing State - Condensation

Objective: Describe on the molecular level how cooling water vapor causes condensation.

Demonstration

Which cup has the most moisture on the outside of it? The cup that is exposed to more air has the most moisture on the outside of it. #1 Why do you think the cup that is exposed to more air has more water on the outside of it? In Your Notebook

Some people think that the moisture that appears on the outside of a cold cup is water that has leaked through the cup. How does this demonstration prove that this idea is wrong? Demonstration

Fundamental Vocab Dense – A substance that has a high density; thick. Condensation – The process of changing the state of a gaseous substance to the state of a liquid substance due to a decrease in temperature. The process of changing the state of a liquid substance to the state of the gaseous substance due to an increase in temperature at the bottom of the substance.

#2 What are some examples of condensation? When water drops form on blades of grass (dew). When clouds form in the sky. When you see your breath on a cold day. In Your Notebook

Discussion You may have made a cold window “cloudy” by breathing on it and then drew pictures with your finger. Where do you think that cloudiness comes from? A real could is made of tiny droplets of water. Where do you think they come from? The water in a cloud comes from water vapor in the air that has condensed.

Activity – Part I 1. Fill a wide clear plastic cup about ⅔ full of hot tap water. Place the tall cup upside down inside the rim of the bottom cup as shown.

2. Watch the cups for 1–2 minutes. 3. Use a magnifier to look at the sides and top of the top cup. 4. Take the top cup off and feel the inside surface. Activity – Part II

#3 What did you observe on the inside of the top cup? The inside of the top cup is coated with tiny drops of liquid water. #4 How do you think the drops of water on the inside of the top cup got there? Some of the water in the cup evaporated, filling the inside of the top cup with invisible water vapor. Some of this water vapor condensed into tiny drops of liquid water when it condensed on the inside of the top cup. What Did You Observe?

Activity – Does making water vapor colder increase the rate of condensation? How can we get the water vapor we need for this experiment? Will we need more than one sample of water vapor? Should we cool one sample of water vapor, but not the other? How will we cool the water vapor? How will you know which sample of water vapor condensed faster?

Activity Part II 1. Fill two wide clear plastic cups about ⅔ full of hot tap water. 2. Quickly place the taller cups upside down inside the rim of each cup of water, as shown. 3. Place a piece of ice on top of one of the cups.

Activity – Part II 4. Wait 2–3 minutes. 5. Remove the ice and use a paper towel to dry the top of the cup where the ice may have melted a bit. 6. Use a magnifier to examine the tops of the two upper cups.

What Did You Observe? Which top cup appears to have more water on it? Why do you think the cup with the ice has bigger drops of water on the inside than the cup without ice? #5 Does cooling water vapor increase the rate of condensation? What evidence do you have from the activity to support your answer?

Explain It With Atoms & Molecules

Take It Further #8 When you breathe out, there is water vapor in your breath. When you breathe on a cold window in the winter, the window gets tiny droplets of moisture on it or “fogs up.” What happens to the molecules of water vapor as they get near the cold window?

Take It Further #9 When you breathe out in the winter, you see “smoke,” which is really a fog of tiny droplets of liquid water. What happens to the molecules of water vapor from your breath when they hit the cold air?

Take It Even Further 1. Add hot tap water to a wide clear plastic cup until it is about ⅔ full. 2. Add 1 drop of food coloring and stir until the water is completely colored. 3. Turn another clear plastic cup upside down on the cup of hot water as shown. Place an ice cube on the top cup to make condensation happen faster. 4. Wait 1–3 minutes for water vapor to condense to liquid water on the inside surface of the top cup. 5. Use a white paper towel to wipe the inside of the cup to check for any color.

Take It Even Further 12. Is there any color in the water that forms on the inside of the top cup? 13. If you were stranded on an island and only had saltwater, how could you make water to drink?