TESLA Water 2011 Condensation Lesson 5

The Big Idea of this Investigation Water, which covers most of Earth's surface is the only substance on Earth that is found naturally in all three states of matter. Water can change from one state to another depending on the amount of heat that is added or taken away from it.

ENGAGING SCENARIO The Aquatic Center really liked your latest information about the properties of water, especially the part about water evaporating. Now they have a new problem. One of the workers noticed that water was forming on the side of his cup of ice water like the cup was “sweating”. He is trying to figure out different reasons why this is happening and hopes you can help. He has sent us some materials and printed information that may help us figure this out. He also asked us to keep accurate records and labeled drawings in our science notebooks so we can send him a report when we finish the activities. He is looking forward to seeing what we learned so he will know why his cup of ice water is “sweating”. What is the problem we need to solve? What do we need to investigate? The Aquatic Center really liked your latest information about the properties of water, especially the part about water evaporating. Now they have a new problem. One of the workers noticed that water was forming on the side of his cup of ice water like the cup was “sweating”. He is trying to figure out different reasons why this is happening and hopes you can help. He has sent us some materials and printed information that may help us figure this out. He also asked us to keep accurate records and labeled drawings in our science notebooks so we can send him a report when we finish the activities. He is looking forward to seeing what we learned so he will know why his cup of ice water is “sweating”. What is the problem we need to solve? What do we need to investigate?

Kit Inventory What color/shape is the object? Where have you seen this object before? What do you think we will use this for in the unit? What color/shape is the object? Where have you seen this object before? What do you think we will use this for in the unit? These are the objects that have been sent to us by the Aquatic Center. I have put them in this large bag. Let’s see if we can identify them.

NOTEBOOK ENTRY Here are two different cups of water. One contains green room temperature water and the other contains blue ice water. Which cup might represent the cup at the Aquatic center that appeared to be sweating? What forms on the outside of the cup? Record an observation of what you see in your science notebook.

Prediction (related to the focus question) I think that the water on the outside of the cup came from… I think this because… I think that the water on the outside of the cup came from… I think this because… NOTEBOOK ENTRY Focus Question (What is the problem?) How does the water get on the outside of the cup? Discuss with your group of scientists a possible focus question for this investigation.

New Vocabulary Condensation: What we are observing with the cup is called condensation. The droplets of water on the outside of the cup come from water vapor in the air. The cup is not leaking. We can test this by wiping the side of the cup with a Kleenex. Is the water on the Kleenex the same color as the water in the cup? What are other examples when you have seen this happen? Why did the water vapor turn to liquid water on one cup, but not the other? When water vapor in the air touches a cold surface, the change in temperature causes the water molecules in the air to condense and change from a gas back to a liquid. The blue ice water is cooler then the air temperature. Since there is no difference in temperature between the room temperature water and the air temperature, no condensation is formed.

Our Plan 1.Transfer 50 ml of water to a dome lid and place a plastic cup on top to form a condensation chamber. 2.Use a sticky note to label your chamber with your groups name. 3.Place the condensation chamber in a sunny location to observe what happens for 1-2 days. Constructing a Condensation Chamber What do you think will happen to the condensation chamber? NOTEBOOK ENTRY Plastic Cup Dome Lid 50ml of water

Collecting Data Scientists always try to make careful observations. Condensation Chamber: Day One NOTEBOOK ENTRY Condensation Chamber: Day Two Plastic Cup Dome Lid 50ml of water

Making Meaning Conference What changes did you observe happen to your condensation chamber? What made the water vapor condense inside the cup? New Vocabulary Water Cycle: On earth water from oceans and other bodies of water evaporate, becoming water vapor in the air. The water vapor cools and condenses to fall back to earth in the form of precipitation. The rain soaks into the ground, is used by plant, or flows into streams, rivers, lakes, or oceans. Any water exposed to air will evaporate and continue the cycle. Precipitation: rain, snow, sleet, and hail.

Claims and Evidence Use your own words, or words from the word wall, to help you complete the following sentences in your science notebook. I claim that __________ happens when water vapor touches a cooler surface. I know this because… I claim that evaporation and condensation are part of the water cycle. I know this because… I claim that __________ happens when water vapor touches a cooler surface. I know this because… I claim that evaporation and condensation are part of the water cycle. I know this because… NOTEBOOK ENTRY

Reflection/Conclusion Revisit your original prediction and respond to one of the following stems: My prediction was accurate or was not accurate because….. I wish to revise my prediction because… My original thinking has changed because… What did you learn…? What really surprised you…? What new questions do you have…? What would you like to know more about…? NOTEBOOK ENTRY