1. Before Bell Rings Grab two papers from side table Have your two HW papers out for me to grade.

2. Plan for Today Entry Task Ideal Gas Law Introduction
Popcorn Lab using the Ideal Gas Law
Work Time

3. Moles + Stoic Test
If you need to take/complete the test from last unit, come by this week during PH, before, or after school.

4. ETD 44
A hiker climbing Mount Everest left base camp with a tank of oxygen that contained 25.2 cm3 of oxygen at a pressure of 2.3 atm and 19°C. Near the top of the mountain the tank is now under 1.5 atm of pressure and -20.°C. What is it’s new volume?

5. Write: ETD 44ANS. A hiker climbing Mount Everest left base camp with a tank of oxygen that contained 25.2 cm3 of oxygen at a pressure of 2.3 atm and 19°C. Near the top of the mountain the tank is now under 1.5 atm of pressure and -20.°C. What is it’s new volume?

6. ANS: ETD 53 B. A hiker climbing Mount Everest left base camp with a tank of oxygen that contained 25.2 cm3 of oxygen at a pressure of 2.3 atm and 19°C. Near the top of the mountain the tank is now under 1.5 atm of pressure and -20°C. What is it’s new volume?

7. Learning Targets
I can use the ideal gas law to solve for P, V, n, or T.

8. Ideal Gas Law Also can change moles Ideal Gas =
1. Consists of identical particles
2. No intermolecular forces
3. Have perfect, elastic collisions with their containers
Most gases behave ideally except under High P and Small V

9. PV = n R T P = pressure in atm V = volume in Liters n = moles
T = temperature in Kelvin
 R = Ideal gas constant  L • atm
mol • K
How do R’s units cancel?

10. Before + After vs. Right Now!
P1V1 = P2V vs PV = nRT
n1T1 n2T2
Before + After vs At this Moment
RIGHT NOW!

11. Now try this #1…
#1. If you have a 751 mL sample of CO2 at 781 mmHg and 55 °C how many grams will you have?
1.03 atm (0.750 L) = n (0.082) (328 K) n = moles of CO moles x (44 g/1 moles) = 1.28 grams
15 g of O2 = moles of O atm (V2) = moles (0.082) (305 K) V = 5.26 L

12. Now try this #1 …
#1. If you have a 751 mL sample of CO2 at 781 mmHg and 55 °C how many grams will you have?
1.03 atm (0.750 L) = n (0.082) (328 K) n = moles of CO moles x (44 g/1 moles) = 1.28 grams
15 g of O2 = moles of O atm (V2) = moles (0.082) (305 K) V = 5.26 L

13. Table O’ Stuff to Memorzie
Glue the table into your notebook
Make sure you know the information on the table
YOU NEED TO MEMORIZE R=.0821 L*atm*mol-1*K-1
Make sure you know what units you need to be in for the Ideal Gas Law

14. Puttin’ the P in Popcorn
Popcorn Ideal Gas Lab
Puttin’ the P
in Popcorn

15. How much pressure does it take to pop a kernel?
What does the escaped
H2O(g) take with it?

16. Need to find Mass escaped? How?

17. Then find Water Vapor Pressure to Pop the kernel? How?
PV = nRT
You must: Think about units and…..
1. Find volume of a kernel? (How?)
2. Pop 10 kernels together
3. Keep flask moving (No burning)
4. Remove kernel already popped (No burning)
5. Don’t freak out when they pop.

18. Then find Water Vapor Pressure to Pop the kernel? How?
PV = nRT
You must: Think about units and…..
1. Find volume of a kernel? (How?)
2. Pop 10 kernels together
3. Keep flask moving (No burning)
4. Remove kernel already popped (No burning)
5. Don’t freak out when they pop.

19. Learning Targets
I can use the ideal gas law to solve for P, V, n, or T.

20. Homework
Pop Corn Lab
Due class after next
Review sheet won’t be checked, just to help study for test.
Test class after next.