Gas Properties Chemistry: Gas Laws Review
Learning Goals: • Design experiments to measure the relationships between pressure,
volume, and temperature. • Create graphs based on predictions and observations.• Make qualitative statements about the relationships between pressure,
volume and temperature using molecular models.
Previous knowledge: Students are able to describe a molecular model of gas pressure.
1.P1/T1 = P2/T2
2.
3.As pressure increases, volume decreases4.Direct relationship between volume and
temperature5.PV = nRT6.Law that allows for respiration!7.Law involving the direct relationship between moles
and pressure/volume
New warm up paper Warm ups #4 (April) Number 1-7: Name the law…
1. Gay-Lussac2. Combined Gas Law3. Boyles4. Charles
5. Ideal gas law6. Boyles7. Ideal
8. Whose Law?
Gay Lussac Law
9. Whose law?
BOYLEP1 (V1) = P2 (V2)
11. This is a direct relationship. True or False? F
10. Whose Law?
Charles’ LawV1 / T1 = V2 / T2
11. This is a direct relationship. True or False? T
11. Name the law…
Boyle’s Law
Allows for respiration!
12. What does this graph indicate?
0 1 2 3 4 5 6 7 8 9 100
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2Pressure vs Volume
Volume in Liters
Pre
ss
ure
(kP
a)
13. What variables were held constant?
0 1 2 3 4 5 6 7 8 9 100
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2Pressure vs Volume
Volume in Liters
Pre
ss
ure
(kP
a)
A.Pressure and Volume B.Pressure, number of particles, and VolumeC.Number of particles and temperatureD.Volume, number of particles and temperature
14. What does this graph indicate? 0 1 2 3 4 5 6 7 8 9 10
020406080
100120140160
X vs Y
X
Y
15. Which explanation could be used to explain the relationship between temperature and pressure for gases?
A.Pressure depends on the number of collisions and if the temperature increases, the molecules increase speed, so they would hit the sides more and the pressure would go up.B.Pressure depends on the energy of collisions and if the temperature increases, the molecules increase speed, so they would hit the sides with more energy and the pressure would go up.C.Both help explainD.Neither help explain
16. What are the properties of gas? (#1 on study guide)
17. What units are used to measure pressure and what factors affects pressure?
1. Expansion: 2. Fluidity: 3. Low density: 4. Compressibility:5. Diffusion and effusion:
Atm, kPa, mmHg, torrAffected by:
• Kinetic theory (collisions) • Pressure • Volume• Temperature
Absolute zero
• https://www.youtube.com/watch?v=f1eAOygDP5s
• https://www.youtube.com/watch?v=g97MzBArEkM
Math problems!
• Work on the gas law problems in your study guide, #23-34– Solve on a separate sheet of paper (show
work) and attach to study guide
List the things that affect gas pressure and draw graphs and equations that shows the correct relationships.
Gas Laws with just 2 variables
0 1 2 3 4 5 6 7 8 9 100
0.5
1
1.5
2Pressure vs Volume
Volume in Liters
Pre
ss
ure
(kP
a)
P1V1 = P2V2
0 1 2 3 4 5 6 7 8 9 100
100
200
Number of particles vs Pressure
Number of particles
pressure
𝑷𝟏
𝒏𝟏
=𝑷𝟐
𝒏𝟐
0 1 2 3 4 5 6 7 8 9 100
50
100
150
Temperature vs Pressure
Temperature
pressure
𝑽𝟏
𝑻 𝟏
=𝑽 𝟐
𝑻 𝟐0 1 2 3 4 5 6 7 8 9 10
0
50
100
150
Temperature vs Volume
Temperature
Volume
𝑷𝟏
𝑻 𝟏
=𝑷𝟐
𝑻 𝟐
Remember that the other variables must be held constant