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