Chem Catalyst Convert the following to K Convert the following to °C Solve the following: A sample of gas has a volume of 120L at a temperature of 40°C. The temperature drops to 10°C. If nothing else changes, what is the new volume of the gas?

Chem Catalyst ANSWERS Convert the following to K 52°C = 325K -123°C = 150K Convert the following to °C 460 K = 187°C 56 K = -217°C Solve the following: A sample of gas has a volume of 120L at a temperature of 40°C. The temperature drops to 10°C. If nothing else changes, what is the new volume of the gas? = 108.5L

Boyle’s Law Lab

How does gas volume affect gas pressure? Key Question today: How does gas volume affect gas pressure?

Your Task At lab stations, follow the directions perfectly! For printing – print to C152, NOT C114!!! Retrieve your graph when finished Answer analysis questions Questions are on the projector stand Answer them on your GRAPH or in your notebook DO NOT write on my worksheets PLEASE!! These are HW if you do not complete them in class. To print = go to start menu, select “printers and faxes”, select “add a printer”, click next until you get to the screen in which you can “find now”, search for the printer for C152 and then print Put your names on the bottom, print out 1 for everyone in your group

Boyle’s Gas Law Lab Analysis Responses Answer to question 2? Answer to question 3? Answer to question 4? Relationship between pressure & volume? Answer to question 7? Answer to question 8?

Boyle’s Law P1V1 = P2V2 Relationship between pressure and volume When temperature is held constant As pressure increases = volume decreases Indirect relationship!! P1V1 = P2V2

Standard Conditions (STP) Standard temperature 0⁰C 273 K Standard pressure 1 atm 760 mmHg 760 torr 101.3 kPa Pressure conversions: 1 atm = 760 torr 1 atm = 760 mmHg 1 atm = 101.3 kPa

Analysis (cont.) Create the following table on your graph and calculate the last 2 columns Volume (mL) Pressure (kPa) P/V = k PV = k 4 250 6 200 9 130 13 90 15 70 17.5 20 60

Analysis (CHECK YOUR ANSWERS) Create the following table on your graph and calculate the last 2 columns Volume (mL) Pressure (kPa) P/V = k PV = k 4.5 250 55.6 1125 5.5 200 33.3 1100 9 130 14.4 1170 13 90 6.9 15 70 4.67 1050 17 4 1190 19.5 60 3

Analysis (cont.) What is Boyle’s Law? (mathematical equation)

Boyle’s Law Practice