Homework Check (Boyle’s Law)

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Homework Check (Boyle’s Law) 1.00 L of a gas at a fixed temperature and 1 atm is compressed to 0.473 L. What is the new pressure of the gas? The pressure of Helium gas in a 1.00 L balloon is 0.988 atm. What is the new pressure if the balloon is blown to become 2.00 L? Divers get “the bends” if they come up too fast because gas in their blood expands, forming bubbles in their blood. If a diver has 0.05 L of gas in his blood under a pressure of 250 atm, then rises fast to a depth where his blood has a pressure of 50.0 atm, what will the volume of gas in his blood be?

Charles’s Law Temperature

Temperature: Average Kinetic Energy K = ⁰C + 273 ⁰C = K – 273

Absolute Zero (0 K = −273 ⁰C) * Watch a Video!* Lowest possible Temperature (theoretically) The atoms have the lowest possible Kinetic Energy (not moving)

Charles’s Law (T vs. V) As Temperature increases, Volume increases; as T decreases, V decreases Volume is directly proportional to Temperature (K)

Examples The volume of a bubble is 1.5 L. If its temperature increases from 20 ⁰C to 50 ⁰C, what is its final volume? How hot will a 2.3 L balloon have to get to expand to a volume of 400 L? The initial temperature of the balloon is 25 ⁰C.

Practice! (on a separate piece of paper) If I have a 0.25 L potato chip bag at a temperature of 19 ⁰C, and I leave it in my car which has a temperature of 60 ⁰C, what will the new volume of the bag be? If I place a balloon with a temperature of 22 ⁰C and a volume of 0.5 L in my fridge, what will be the volume of the balloon when it is fully cooled by my fridge with a temperature of 4 ⁰C? A gas at 89 ⁰C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L?