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 Justine_5420 #1 Posted : Saturday, July 04, 2020 4:41:29 PM Rank: MemberGroups: Registered Joined: 5/13/2020Posts: 14Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Hello,I have a question pertaining to the Physical Sciences section on the Altius #2 COVID Exam. It is attached to a passage but doesn't require any information from the passage as it is given in the question stem.This question asks how decreasing the length by 50% and increasing the radius by 100% will affect the number of moles in a new concentration vs. an original concentration. At first glance this is a chem question regarding the idea gas law, but as you look through the Altius solution, it looks like they are applying some physics principles. For example: as you increase the radius by a certain factor, you increase the pressure by that factor, and as you decrease length by a certain factor, you increase volume flow rate by that factor.Can I approach this question like this? Using this method, I am having difficulty mathematically coming to the ration that they did to find the answer. Should I stick to the ideal gas law? In addition could you please explain how they found increases of a factor of 5 and 2?Thank you in advance. Back to top User Profile
 INSTR_Radhika_42 #2 Posted : Tuesday, July 07, 2020 5:03:23 PM Rank: MemberGroups: Registered Joined: 6/15/2019Posts: 21Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Hello,Thank you for your question!In order for me to answer this best, would you be able to post or PM me the passage and solution?I suspect this has to do with the shape of the container and potentially fluid dynamics which is why the solution may not have used Ideal Gas Law but I'd need more information to be able to shed light.Thanks! Back to top User Profile
 Justine_5420 #4 Posted : Thursday, July 16, 2020 9:48:48 PM Rank: MemberGroups: Registered Joined: 5/13/2020Posts: 14Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) That's very helpful thank you so much! One follow up: why did you use the equation pi(r^2)x L for the volume? Back to top User Profile
 INSTR_Radhika_42 #5 Posted : Monday, July 20, 2020 11:31:23 AM Rank: MemberGroups: Registered Joined: 6/15/2019Posts: 21Thanks: 0 timesWas thanked: 0 time(s) in 0 post(s) Good question - I saw this as a cylinder! You can use 'h' instead of 'L' if that's more intuitive :) Back to top User Profile
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