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Temperature Essay

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Name: ___________Naomi Scharf___________________________ Date: 3/17/11________________________

Student Exploration: Boyle’s Law and Charles’ Law

Vocabulary: absolute zero, Boyle’s law, Charles’ law, Kelvin scale, pressure

Prior Knowledge Question (Do this BEFORE using the Gizmo.)
A small helium tank measures about two feet (60 cm) high. Yet it can fill over 50 balloons! How can such a small tank contain enough helium to fill so many balloons?

_The tank is compressing the helium into a denser state but when it is put in the balloons it expands and takes up more space. __________________________________________________________________________

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Predict: If the added mass on the lid was 50 kg, a total mass of 60 kg would exert pressure on the gas inside the container. What would be the volume of the gas? __.42 ______________

7. Test: Test your prediction using the Gizmo. What is the volume of the gas? __.42___________

Was your prediction correct? ____yes_________

8. Create a graph: Select the GRAPH tab. Set the mass slider to 0 kg, and click Record to plot a point on the graph. Plot a point for each possible mass to create a graph showing the relationship between pressure and volume.

When your graph is completed, click the camera icon () to take a snapshot. Paste the image into a blank word-processing document, and label the graph “Volume vs. Pressure.”

A. What is the shape of the graph? __a curved, decreased line _______________________________________

B. How does this graph illustrate Boyle’s law? As more pressure is added the volume decreases and the graph shows this because it is decreasing as well. _________________________________

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9. Apply: Think about a small helium tank that can fill 50 balloons. What must be true about the helium in the tank compared to the helium in the balloons?

___The helium in the tank must be more dense than the helium in the balloons. ______________________________________________________________________

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