10/22 Do Now1) What is the 3rd Gas Law?

2) Use the 3rd gas law to solve the following problem: A sample of gas, whose volume at 300 K is 0.127 L, is heated at constant pressure until its volume becomes 0.317 L. What is the final temperature of the gas in Kelvin?

3) Use the 2nd gas law to solve the following problem: A student collects 25mL of gas at 0.95atm. What volume

would this gas occupy at 1atm? 4) Collect returned work and organize it into your binder.• Consider Global Warming, do you think human activities add to the amount of greenhouse gases in our atmosphere? What is happening to the

pressure of gas in our atmosphere? What does that mean in relation to the Earth’s temperature?• Which gas law do you think best connects to Global Warming?

Grab calculators & handouts, begin the Do Now

Exit Ticket #9Complete Exit Ticket 9 to the best of your abilities

on your own & without notes.

CORRECTION!#6 (Honors #8): what’s the “resulting PRESSURE”

Combined Gas Law SimulationDo changes in volume have a greater effect on

the pressure or the temperature of a gas?

• Directions:• In the next 10 minutes…• Complete the pre-lab for the Charles’s Law

Lab. • Set – up the simulation on your netbook

Combined Gas Law Lab ReportDirections:Once finished with the simulation, work on completing the lab report for the Combined Gas Law simulation. Also, close and return your netbook to the cart.

Don’t forget the proper sections:- Title & Name- Pre-lab- Data- Post-Lab Questions- Conclusion (RERUN)

The Combined Gas Law

Key Point #1:The combined gas law relates all 3 variables – P, T, and V – at once

P1V1 = P2V2

T1 T2

Combined Gas Law Example 1If I initially have a gas at a pressure of 12 atm, a volume of 23 liters, and a temperature of 200 K, and then I raise the pressure to 14 atm and increase the temperature to 300 K, what is the new volume of the gas? P1 =

V1 =

T1 =

P2 =

V2=

T2=

Combined Gas Law Example 2If I have 2.9 L of gas at a pressure of 5 atm and a temperature of 50 0C, what will be the temperature of the gas if I decrease the volume of the gas to 2.4 L and decrease the pressure to 3 atm? P1 =

V1 =

T1 =

P2 =

V2=

T2=

Exit Ticket #10Complete Exit Ticket 10 to the best of your abilities

on your own & without notes.