1. Graham’s Law Daltons Law

2. Common Core Connection
Objectives:
Today I will be able to:
Apply the kinetic molecular theory to solving Graham’s Law problems
Calculate the partial pressure of a gas using Daltons Law
Apply the gas laws to solving problems
Informal assessment – monitoring student interactions and questions as they complete the lab and practice problems
Formal assessment – analyzing student responses to the lab, practice and exit ticket
Common Core Connection
Reason abstractly and quantitatively
Make sense of problems and persevere in solving them

3. Lesson Sequence Evaluate: Warm-Up Explain: Graham’s Law
Explain: Dalton’s Law Notes
Elaborate: Dalton’s Law Practice
Elaborate: Mixed Gas Law Practice
Evaluate: Exit Ticket

4. Warm - Up Rearrange the equation PV=nRT to solve for n/v
Out of the gases H2 Br2 and Cl2, which will diffuse the fastest and why?

5. Homework Complete practice problems
Lab has been rescheduled for tomorrow
Gases Exam
Tuesday, April 1st

6. Agenda Warm up Graham’s Law Notes and Practice
Dalton’s Law Notes and Practice
Mixed Gas Law Practice
Exit Ticket

7. Stoichiometry Exam Review

8. Graham's Law

9. Graham’s Law
The rates of diffusion of gases at the same temperature and pressure are inversely proportional to the square roots of their molar masses
Normal language: lighter gases move through the air faster than heavier gases
Example: helium moves faster than radon

10. Graham’s Law
Diffusion – particle movement from an area of high  low concentration
Effusion – diffusion of gas particles through an opening
NET MOVEMENT
NET MOVEMENT

11. Graham’s Law
Rate = rate of diffusion or effusion – usually measured in distance/time (m/s)
M = molar mass

12. Graham’s Law
On average, carbon dioxide travels at m/s at 25.0˚C. Find the average speed of chlorine gas at 25.0˚C. Hint: put the lighter gas in the numerator
= 323 m/s

13. Grahams Law Practice
Complete the practice at your desk. If you have questions, please ask Mr. Klotz. We will review selected problems

14. Dalton’s Law of Partial Pressures

15. Dalton’s Law of Partial Pressures
The sum of the pressures of all gases present in a system equals the total pressure of the system
P1 + P2 + P3 + … = Pt

16. Exit Ticket
Doodles:
Sketch or draw 3 concepts you learned from the lesson using images or diagrams