Understanding Gases

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9 Questions
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Understanding Gases

After watching the previous video clip Diffusion of Gases, from The Chemistry Journey), explain using the concept of diffusion why smoke from a fire will eventually fill a room.  
Use the previous video GCSE Science Revision - Diffusion of Gases to answer the following questions:   1. Why did the NO2 gas diffuse faster that the Br2 gas?   2. Will gases diffuse faster in  air or when air is removed, like in a vacuum? Explain. 
Learn more about diffusion from the video below. The next question will focus on the video, so watch closely! (This annotation contains a video)
This video is a great summary of gas diffusion. Pay close attention from 0:30 sec to 2:30 sec to see an experiment which shows the difference between diffusion through air, and when air is removed, and how lighter gases diffuse faster than heavier gases. The next question will focus on this video. (This annotation contains a video)
Please explain what causes gas pressure. 
Gas pressure and volume (This annotation contains a video)
Why is there less atmospheric pressure at higher elevations? 
Vacuums can be used to take the air out of spaces!  (This annotation contains a video)
How many kPa (Kilopascals) is 2 atmospheres equivalent to?  
1. What do the letters "STP" stand for? 2. Why is "STP" used by scientists?  
1. What is standard pressure measured in kilopascals? 2. What is standard temperature measured in Kelvin?  
1. Why is the Ideal Gas Law useful?2. What are the limitations of the Ideal Gas Law? 
This video gives a summary of the ideal gas law from time 0-1:45. Watch until 1:45. (This annotation contains a video)
This is a good summary of KMT as it relates to ideal gases.  (This annotation contains a video)
Tell whether the following is assumed true or false based on the principle of the Ideal Gas Law. If it's false, correct it to make it true.1. Molecules in a gas are large and close together.2. When gas molecules collide, they do not lose any energy.3. Gas molecules always move from left to right.4. When molecules collide, they make a "u" turn.  
Understanding Gases Quiz