11.2 Gas Laws Charles's Law

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Gas Laws

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​Class Announcements:

• Mini Test Friday

• 18 days to make up or retake exams!

School Announcements:

• May 15th Early Release

• Boyle's Law

• Charles’s Law

• Avogadro’s Law

• Ideal Gas Law

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Charles's Law: Temperature and Volume

Charles's Law states that at constant pressure, the volume of a gas is directly proportional to its Kelvin temperature.

Charles's Law cont.

The straight line for the gas indicates that volume and temperature are in direct proportion.

Charles's Law cont.

When temperature increases, volume increases, and when temperature decreases, volume decreases.

Multiple Choice

According to Charles's Law when the temperature decreases the volume will

• decrease

• increase

• stay the same

Multiple Choice

According to Charles's Law, when the temperature increases, the volume will

• increase

• decrease

• stay the same

Kinetic Explanation of Charles's Law

As the gas particles are heated, they move faster and have more collisions with the sides of the container and move the piston upward creating an increase in volume.

Charles's Law cont.

The equation to the right can be used to find the volume of temperature.


Must Convert to Kelvin.

Fill in the Blank

30^oC to Kelvin

.

Fill in the Blank

-4^oC to Kelvin

.

Charles's Law Example Problem

Multiple Choice

 A balloon is filled with 3.0 L of helium at 310 K and 1 atm. The balloon is placed in an oven where the temperature reaches 340 K. What is the new volume of the balloon?

$$\frac{V_1}{T_1}=\frac{V_2}{T_2}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \frac{T_2V_1}{T_1}\ =V_2$$

• 0.92 L

• 4.2 L

• 3.3 L

Multiple Choice

A 4.0 L sample of methane gas is collected at 303 K. Predict the volume of the sample at 273 K.


$$\frac{V_1}{T_1}\ =\frac{V_2}{T_2}\ \ \ \ \ \ \ \ \ \frac{T_2V_1}{T_1}=V_2$$  

• 3.6 L

• 4.4 L

• 2.3 L