1. - Chemistry -
Gas Laws
(notes)

2. “P and V hold an inverse relationship”
Boyle’s Law
“P and V hold an inverse relationship”
When V
then P
-> P x V is a constant
P x V = k or
P1V1 = P2V2
Mnemo: “ ”

3. “T and V hold a direct relationship”
Charles’ Law
“T and V hold a direct relationship”
When T
then V
-> V / T is a constant
V / T = k or
V1/T1 = V2/T2
Mnemo: “Charles has Direct TV”

4. “T and P hold a direct relationship”
Gay-Lussac’s Law
“T and P hold a direct relationship”
When T
then P
-> P / T is a constant
P / T = k or
P1/T1 = P2/T2
Mnemo: “ ”

5. Keep constant:
Play with:
Law: T
P, V
Boyle:
PV = k
T, V
Charles:
T / V = k P V
T, P
Gay-Lussac:
T / P = k

6. Example:
A 1 atm pressure occupies a volume of 4L. What will be the pressure if you reduce the volume to 2L?
P1= 1 atm
V1= 4L
P2= ?
V2= 2L
Formula:
Law:
P1 x V1 = P2 x V2
P2 = P1 x V1 / V2
Boyle’s
Isolate P2:
= 1 atm x 4L / 2L
= 2 atm
Add to your Tabs foldable.

7. Example 2:
A 303K temperature occupies a volume of 3L. What will be the volume if you change the temperature to 400K?
T1= 303 K
V1= 3L
T2= 400K
V2= ?
Formula:
Law:
V1 / T1 = V2 / T2
V2 = V1 x T2 / T1
Charles’
Isolate V2:
= 3L x 400K / 303K
= 3.96 L
Add to your Tabs foldable.

8. Example 3:
A 273K temperature has a pressure of 590 mmHg. What will be the pressure if you change the temperature to 373K?
P2= ?
T1= 273 K
P1= 590mmHg
T2= 373K
Formula:
Law:
P1 / T1 = P2 / T2
P2 = P1 x T2 / T1
Gay-Lussac’s
Isolate P2:
= 590mmHg x 373K / 273K
= mmHg
Add to your Tabs foldable.

9. Constructing the “Tabs”
Then: (each tab)
Units of P, V, and T
BOYLE’S Law
CHARLES’ Law
GAY-LUSSAC’S Law
COMBINED GAS Law
IDEAL GAS Law
DALTON’s Law
Front Tab:
Your name,
period,
date
Title:
“Unit 5: Gas Laws”
Back:
KMT

10. Include, for Boyle’s, Charles’, and Gay-Lussac’s gas laws: Description
Formulas
Mnemo device
Example problem
For COMBINED gas law:
Main Formulas, both forms
Isolated equations for the 6 variables
For KMT:
Description of each Postulate, using txt mssg lang