1. Review the Content Gases on the D2L site, and the chapter on Gas Laws in the Hill textbook.
2. Complete the Clicker Questions on Gas Laws in the Teaching Idea “Concept Questions for Chemistry using PhET” posted by Trish Loeblein.
1. There are 2 balloons in a room. They are identical in size and material. One balloon is filled with air and the other balloon is filled with Helium. How does the pressure of the air balloon compare to the pressure of the Helium balloon. The pressure in the air balloon is:
Answer: C, greater, because the air is more dense than the helium and this means that with it being denser it has a greater amount of pressure.
2. How does the pressure in the Helium balloon compare to the pressure of the air in the room? The pressure in the Helium balloon is:
Answer: A, less , this is because if the balloon does float in the air it has to have less pressure than the amount of pressure that is in the air.
3. How do the number of air molecules in the air balloon compare to the number of He atoms in Helium balloon? The number of air molecules is:
Answer: A, less, the number of helium molecules are less than helium atoms because air molecules take up more space because air molecules are larger than helium molecules.
4. How does the average speed of the Helium molecules compare to that of the air molecules? The average speed of the He molecules is:
Answer: C, greater, because helium molecules are smaller and able to move faster. This allows them to travel around faster inside of balloons compared to air molecules.
5. What will happen to the pressure if temp is held constant and the volume is decreased?
Answer: B, this is because when I decreased the volume the pressure increased. When doing this more collisions are happening but with each collision the force is the same. Boyle's law states that at constant temperature, the volume of gas is inversely proportional to its pressure.
6. You are flying from Denver to Boston, and you bring along a ½ full bottle of shampoo that was well sealed before you left Denver. You land in Boston and proceed to your hotel. The number of air molecules within the shampoo bottle:
Answer: B, stayed the same, since the shampoo bottle is sealed the change pressure did not affect the air molecules inside the bottle.
7. If the walls of the shampoo bottle are strong and rigid so that the bottle has the same shape as before you left, how does the pressure of the air inside the bottle compare to the pressure of the air in Denver?
Answer: B, equal to, this is because the bottle is from Denver, so the pressure inside the bottle is the same as the pressure of the air in Denver.
8. How does the pressure inside the bottle compare to the pressure of the air in Boston?
Answer: A, less than, because the pressure in Denver is lower than it is in Boston, this is because Denver is at a higher altitude.
9. If you had a water bottle with very soft sides. When you open your suitcase in Boston, the bottle would look:
Answer: A, squished, this is because the pressure in the air is greater is than the pressure in the bottle. So pressure that is being applied on the bottle will cause the bottle to squish together.
Kelsey, great job organizing this post! I like how you wrote "answer:" so that people are directed right to your answers and responses. I really enjoyed reading your responses to each answer and it was interesting to compare them to my own. It seems like we had a lot of the same responses, which shows our thought processes are very similar!
ReplyDeleteI agree with Mackenzie, writing "answer" next to your answers really helped differentiate your responses from the questions. Your responses were well thought out and made a lot sense. I liked that they were short and too the point but didn't leave out super important information. Great job!
ReplyDeleteGreat job on your answers- I had many of the same ones so I hope that means they are correct! I thought the bottle and pressure questions were very interesting! I had never thought of that before. I wonder if that affects the way things are produced?
ReplyDeleteI like how organized your post looks. I had mostly the same answers as you except you had more information on your to make sure that nothing was left out which is awesome.
ReplyDeleteGreat answers! #4 and #9 are very thorough and well explained. We have very similar answers. I thought that for #1 the pressures would be equal because the balloons are under the same conditions. Overall, your answers are very well explained and great for peers to understand the reasoning.
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