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Now we will explore the relationship between the temperature of an enclosed gas and the pressure it takes up under constant volume.  This lab will help us to better describe this relationship in a quantitative and qualitative sense.  You will know you succeeded when you can make predictions about unknown temperatures or pressures when enclosed gases are modified under constant volume conditions.

Agenda

• Warm Up 73

1. Describing gas changes:

(a) Describe how the pressure of an enclosed gas would change in a sealed container under constant temperature if you were to compress the container to 1/3 of the original volume.

(b) Describe how the volume of a flexible latex balloon would change if the air sealed inside it was heated from 300K to 400K.  Be sure to describe changes to the motion of the particles and pressure variations from inside air and outside air.

2. Solve and show your work:

(a) 19.55 mL of a gas in a flexible sealed container is expanded to 64.73 mL.  If the starting pressure of this gas was 55.4 kPa, what is the final pressure?

(b) Neon is held in a flexible container.  The gas is heated to a final temperature of 500 K and has a measured volume of 525 mL.  If the starting volume was 313 mL, what was the initial temperature of this gas?  Assume pressure is constant.

Homework

• Finish Practice 6.2a, 6.2b, and 6.2c
• Submit your Lab 6.2c Report to Peergrade (due Friday at 11:59pm)
• Review concepts from topic 6.1 and 6.2 – Quiz Friday
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