Intentions for success: We will be successful when we can describe the behavior of gasses. Sept. 4, 2018 Vocab: Pressure, Absolute zero, Charles’s law, Boyle’s Law Warm up: I have a soda in a plastic bottle. What factors affect the pressure?

Ch. 8 - Solids, Liquids, & Gases MATTER Ch. 8 - Solids, Liquids, & Gases III. Behavior of Gases (p.75-81) Pressure Boyle’s Law Charles’ Law

A. Pressure Which shoes create the most pressure?

A. Pressure Key Units at Sea Level 101.325 kPa (kilopascal) 1 atm 760 mm Hg 14.7 psi

A. Pressure Barometer Manometer Atmospheric Pressure Contained Pressure

A. Pressure Effect on Boiling Point When atmospheric pressure increases, the boiling point of a liquid increases. EX: high altitude cooking, boiling cold water

B. Boyle’s Law When the volume of a gas decreases, its pressure increases (at constant temp). Pressure and Volume are inversely proportional PV = k P V INVERSE

B. Boyle’s Law Boyles Law animation Demonstration

P1V1 = P2V2 B. Boyle’s Law INVERSE A sample of gas has a volume of 12.0 L and a pressure of 1.00 atm. If the pressure of gas is increased to 2.00 atm, what is the new volume of the gas? P V INVERSE

C. Charles’ Law When the temperature of a gas increases, its volume also increases (at constant pressure). Volume and Temperature are directly proportional. V T DIRECT

C. Charles’ Law Volume and Temperature are directly proportional. Temperature must be in Kelvins in order for this to be directly proportional Celsius to Kelvin conversion factor T(K) = T(C) + 273

C. Charles’ Law Charles Law Demo

C. Charles’ Law V1/T1 = V2/T2 On hot days, you may have noticed that potato chip bags seem to “inflate”, even though they have not been opened. If I have a 250 mL bag at a temperature of 19 0C, and I leave it in my car which has a temperature of 60.00 C, what will the new volume of the bag be?

C. Charles’ Law -273°C or 0 K Absolute Zero - Temp at which... the volume of a gas would equal zero. all particle motion would stop. -273°C or 0 K

B. Gas Law Video Boyles Law animation

Boyle’s Law Practice To compress nitrogen at 1 atm from 750 mL to 500 mL, what must the new pressure be if the temperature is kept constant? What would be the new volume if the pressure on 600 mL is increased from 90 kPa to 150 kPa?

Boyle’s Law Practice A student collects 25 mL of gas at 96 kPa. What volume would this gas occupy at 101.325 kPa. There is no change in temperature or mass. A gas measuring 525 mL is collected at 104.66 kPa. What volume does this gas occupy at 99.33 kPa?

Charles’s Law Practice The temperature inside my refrigerator is about 4.00 Celsius. If I place a balloon in my fridge that initially has a temperature of 220 C and a volume of 0.50 liters, what will be the volume of the balloon when it is fully cooled by my refrigerator?

Charles’s Law Practice Some students believe that teachers are full of hot air. If I inhale 2.2 liters of gas at a temperature of 180 C and it heats to a temperature of 380 C in my lungs, what is the new volume of the gas? Continue completing the Gas Law Handout