Embedded Files
Lesson Instructions
Lesson Instructions
Review the learning goals and success criteria for Topic 4: The Combined Gas Law.
Review the minds on, action, and consolidation sections of the lesson, completing any tasks as outlined.
Complete the fill-in-the-blanks handouts that have been provided to you. They have been linked below.
Practice and apply what you've learned by completing the practice tasks outlined at the end of the lesson.
Learning Goals
Learning Goals
I am learning to ...
define the conditions for STP or SATP.
use molar volume to find the volume of a gas.
use the Combined Gas Law to determine the effect of changing pressure, temperature or volume.
Minds On
Minds On
Molar Volume
Molar Volume
Knowing the amount of gas available for a dive is crucial to a diver's survival. The tank on the diver's back is equipped with gauges to indicate how much gas is present and what the pressure is. A basic knowledge of gas behaviour allows the diver to assess how long they can stay underwater without developing problems.
Combined Gas Law
Combined Gas Law
The modern refrigerator takes advantage of the gas laws to remove heat from a system. Compressed gas in the coils is allowed to expand. This expansion lowers the temperature of the gas and transfers heat energy from the material in the refrigerator to the gas. As the gas is pumped through the coils, the pressure on the gas compresses it and raises the gas temperature. This heat is then dissipated through the coils into the outside air. As the compressed gas is pumped through the system again, the process repeats itself.
In this video, you will learn how to get an egg into a bottle using a flame and the combined gas law. The egg will be able to enter a bottle that has an opening smaller than the diameter of the egg. By the end of this video you will be able to explain how the egg in the bottle experiment works and how it relates to the laws of gases.
Action
Action
Molar Volume, Vn
Molar Volume, Vn
the volume occupied by one mole of a gas.
all gases occupy the same volume at the same temperature and pressure.
the relationship between the number of moles (n), volume (L), and molar volume (Vn) is described by the formula:
At Standard Temperature and Pressure (STP):
T = 273.15 K
P = 101.3 kPa
Vn = 22.4 L/mol
At Standard Ambient Temperature and Pressure (SATP):
T = 298.15 K
P = 100. kPa
Vn = 24.8 L/mol
Example
Example
A sample of methane, CH4 , occupies 4.50 L at STP. How many moles of methane are present?
Example
Example
What volume would 4.55 g of hydrogen gas occupy at STP?
Summary
Summary
Equal volumes of gases under the same conditions contain the same number of particles.
Standard temperature and pressure is defined as 0oC (273.15K) and 1atm pressure.
The Combined Gas Law
The Combined Gas Law
The combined gas law combines Boyle's Law, Charles' Law, and Gay-Lussac's Law into ONE formula:
Example
Example
A 400. mL sample of gas is stored at 25oC and 90.0 kPa. If the same gas is stored in a 750. mL container at 60.0 kPa, what will the temperature be?
Example
Example
A 600. mL sample of gas is being stored at 99.5 kPa and 25oC. What volume would this gas occupy at STP?
Practice
Practice
Now that you've learned how to use the Combined Gas Law, try solving this problem:
Now that you've learned how to use the Combined Gas Law, try solving this problem:
2.00L of a gas at 35oC and 0.833atm is brought to standard temperature and pressure (STP). What will be the new gas volume?
Summary
Summary
The combined gas law shows the relationship among temperature, volume, and pressure:
This lesson is now complete. Consolidate your learning by evaluating the self-check below and the assigned practice questions.
Self-Check
(This is a self-assessment of your learning – you do not need to submit this).Self-Check
How prepared am I to start my homework? Can I ...
define the conditions for STP or SATP?
use molar volume to find the volume of a gas?
use the Combined Gas Law to determine the effect of changing pressure, temperature or volume?
Practice
Practice
Using your textbook, complete the following questions:
p542 #3-7
p549 #14-16, 18
Google Sites
Report abuse