1. Homework Check (Charles’s Law) 1.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? 2.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? 3.A gas at 89 ⁰C occupies a volume of 0.67 L. At what Celsius temperature will the volume increase to 1.12 L?

2. Gay-Lussac’s Law PRESSURE & TEMPERATURE

3. Pressure & Temperature  Pressure: Force exerted by gas molecules colliding on the Area of the wall  As Temperature rises, gas molecules move faster, thus colliding more on the wall → Pressure increases  Volume (V) and number of gas molecules (n) are fixed

4. Gay-Lussac’s Law (P vs. T) As Temperature increases, Pressure increases; as T decreases, P decreases Pressure is directly proportional to Temperature (K)

5. Examples 1.If a child has a rigid ball with 25 atm of pressure at 22 ⁰C, what will the pressure be at 0 ⁰C? 2.At 10 ⁰C, a gas exerts 0.95 atm of pressure. At what temperature (in Celsius) will it exert a pressure of 0.75 atm?

6. Practice! (on a separate piece of paper) 1.The pressure in a car tire is 1.88 atm at 25.0 ⁰C. What will be the pressure if the temperature increases to 37.0 ⁰C? 2.The pressure of the Oxygen gas inside a canister is 5.00 atm at 25.0 ⁰C. The canister is located at a camp high on Mount Everest. If the temperature there falls to –10.0 ⁰C, what is the new pressure inside the canister? 3.Helium gas in a 2.00 L cylinder is under 1.12 atm pressure. At 36.5 ⁰C, that same gas sample has a pressure of 2.56 atm. What was the initial temperature (in Kelvin) of the gas in the cylinder?