Unit 9
In this unit we will study gases and their relationship with pressure, temperature, and volume. We will derive “Boyles, Charles, Gay-Lussacs, and the Combined Gas Law” in laboratory. Then we will compare 1 mole of gas at STP to gases at other conditions and derive the “Ideal Gas Law”. We will use this law to find the mass of a sample of air and methane. Finally, we will study the rate of escape of a gas in the lab. We will use the data to develop “Graham’s Law”.
Notes, Objectives, and PowerPoints
Unit 9 notepacket
Unit 9 objectives
All PowerPoints are placed in the correct week on the webpage below
Introduction to Gas Laws PowerPoint (Kinetic energy and pressure review with conversions)
PowerPoint on Boyles Law
PowerPoint on Charles and Gay Lussac's Law
PowerPoint on Ideal Gas Law and Graham's Law
PowerPoint on Dalton's Law
Unit 9 problems sets: For all math problems in unit 9, please do the following:
1. Write the Formula you will use.
2. Assign numbers to all variables and show all conversions:
Ex: T1= 10°C + 273 = 283K*
Ex: P1 = 1.20 atm. x 760 mm Hg = 912 mm hg**
1atm.
3. Plug in numbers with labels into the equation and solve
4. Provide a final answer with label and sig. figs. (Lowest number of significant figures in all of the the initial data.)
5. Name of Law: Boyles, Charles, Gay-Lussac’s, Combined, Ideal, Daltons or Grahams Law
*In all gas law problems, temperatures must be converted to Kelvin.
** If you have two pressures or two volumes, they must be in the same units to solve the problem. If not, use these conversion in step 2 above.
C + 273 = Kelvin
101.3 kpa = 1 atmosphere = 760 mm Hg = 29.8 inches of Hg
1000 ml = 1 liter
1 mole = _____grams (periodic table and round to .1 grams
Homework Assigned:
Week of March 17- March 20
Watch the 3 videos about Boyles Law below. I will take you through the first page of the note packet and then you are assigned the following:
Note: Please do NOT perform the demonstrations at home. You do not have the safety equipment needed.
The first video is by Lange and takes you through the first page of notes on the unit 9 note packet. The other Boyles videos show you demonstations of the law and what is happening at the atomic level.
Boyles Law video with sample math problems
Stop at 4:13 before it starts Charles Law
Unit 9 problem set 1: Boyles Law (Please do by Friday, March 20th)
Look at video's below for Boyles Law before doing problem set 1
Gas Law Simulation Lab Activity (Please do by Friday, March 20th)
Use the link to access the lab sheet and a link to the website.
Gases Intro (HTML5)
Supporting Powerpoints for this homework:
Introduction to Gas Laws PowerPoint
PowerPoint on Boyles Law
KEYS to homework due on March 20th
Key to Unit 9 Problem set 1
Key to the Gas Law Simulation Lab Activity
After Spring Break:
Week of March 30th- April 3
There are 7 mini video's for you to watch. There are 3 videos by Lange that take you through a sample Charles Law problem, a sample Gay-Lussac's law problem, and a sample Combined gas law problem. Please note that i
f a gas is at STP that means it is at 0◦C or 273 Kelvin and 1 atmosphere of pressure (760 mm Hg or 101.3 Kpa). That means you know the temperature and pressure.
There are 4 video's that demonstrate each law and what is happening in a mini labs.
** Videos range in lengh from 6 minutes to 50 seconds.
Optional:
The final video at the bottom called
THE GAS LAWS takes you through all 4 gas laws with examples.
This is a great review video.
Supporting Powerpoint notes for this homework:
PowerPoint on Charles and Gay Lussac's Law
These are the next 7 video's to watch after spring break. The final optional video is a review of all laws.
Charles law video demonstration
Charles Law and Very Cold Liquid Nitrogen
Sample Charles Law problem in note packet by Lange
Gay Lussacs video demonstration
Gay Lussacs sample problem in the note packet by Lange
Combined gas law demonstration
Sample Combined Gas Law problem from note packet by Lange
Optional Video review: Sample gas law problems worked out: Boyles, Charles, Gay-Lussacs, and Combined Gas Laws
NOTE: Gas Laws are based on the Kelvin Temperature Scale.
All temperatures must be converted into Kelvin. T1= 10°C + 273 = 283K
Use conversions at top of page 1 of note packet and make sure volume and pressure units are the same.
Supporting Powerpoint notes for this homework:
PowerPoint on Charles and Gay Lussac's Law
This homework will be due on April 3rd:
1. Unit 9 problem set 2: This problem set is on Boyles, Charles, Gay-Lussacs, and the Combined gas laws (this is a combination of all 3 laws). Please either print the worksheet or open in Canvas and fill in electronically.
2. Mathematical simulation lab on gas laws: Please either print it or open in Canvas and fill in as you do the lab. The link to the simulations is embedded in the lab online lab sheet.
Homework: In Canvas you will find both assignments in an electronic form that you can fill out and submit. Due to the nature of typing math problems, you are also welcome to print both documents and fill in by hand. If you fill in by hand, please take a picure of each page of the documents and the pics to clange@ecasd.us. If you type answers electronically on Canvas, please hit the submit button when finished.
Keys to homework due April 3
Key for Problem Set 2
Key for Gas Law Simulation Lab with Calculations.
Chemistry Activities for the week of April 6th to April 9th.
QUIZ on GAS LAWS Problem Sets 1 and 2:
The quiz will be posted on Canvas Monday April 6 and 7th. Students will need to electronically show their work (type it) for each question as shown in the videos and in the quiz directions. The need to click submit when they are finished. I will check the quizzes on April 8th and provide feedback on their quiz. I will post the key to the quiz, offer a helping session online, and then offer a retake the following week.
This homework will be due on April 9th at 11 am on Thursday morning.
1. Unit 9 problem set 3-Ideal gas law This is a new gas law that brings in the mole (yep-the mole box is back!) I made two Lange notes videos to show you where the ideal gas constant came from and how to do a sample problem. Please either print the worksheet and send a pic to Lange or open in Canvas and fill in electronically.
(Do worksheet before you attempt the lab please.)
2. Ideal gas law-Mass of Air Lab: So when staff were able to come back to the building for a couple hours, I made videos of the next 3 labs. (Some are better than others!) Attached you will find the Mass of Air lab sheet. It will also be available on Canvas electronically.
Please either print the lab sheet and send a pic to Lange or open in Canvas and fill in electronically.
NOTE:
Please do problem set 3 before the lab.
There are
2 videos for the lab. The first one is the theoretical data collection. You will collect data for P, V, T and use the ideal gas law to solve for the number of moles. Note: P, V, and T will have to be converted to the same units as R (the ideal gas constant). Once you have the moles, you can change moles into grams of air (mass) using the molar mass provided.
The second video shows how the experimental mass of the air is obtained.
Keys for unit 9 Problem set 3
Key for the Mass of Air Lab
Homework: In Canvas you will find both assignments in an electronic form that you can fill out and submit. Due to the nature of typing math problems, you are also welcome to print both documents and fill in by hand. If you fill in by hand, please take a picure of each page of the documents and the pics to clange@ecasd.us. If you type answers electronically on Canvas, please hit the submit button when finished.
Supporting Powerpoint notes for this homework:
Ideal gas constant derrived by Lange
Ideal gas law sample problem by Lange
Ideal Gas Law/Mass of Air mini lab handout
Video 1 for collection of theoretical data by Lange:
Video 2 for collection of experimental data by Lange:
Chemistry Activities for the week of April 14th to April 17th. (PD Monday for staff)
1. Unit 9 problem set 4-Dalton's and Graham's Laws. Please watch the videos on Dalton and Graham's Law. Please note that for unit 9 problem set 4 #3 you need to use two equations. First find the partial pressure of the oxygen. Then use this partial pressure of oxygen and the ideal gas law to find the number of moles on oxygen. Due Thursday.
2. Graham's Law lab sheet (goes with Graham's Law video lab that Lange did below) Due Thursday.
3. Quiz on Ideal, Dalton's, and Graham's laws on Friday only.
Keys for week of April 17
Unit 9 problem set 4 key
Grahams Law lab-Molecular race key
Langes introduction to Dalton's and Graham's Law
Graham's Law Lab setup
Graham's Law lab data collection
Labs and Activities (In school only labs)
Boyle's Law Lab
Charles' Law Lab
Ideal Gas Law Lab
Graham's Law Lab