Unit 2 Worksheet 3- Pvtn Problems Chemistry Unit 9 Worksheet 1 Gases Again
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Proper noun Date Pd Unit 2 Worksheet three PVTn Problems On each of the issues beneath, get-go with the given P, V, T, or n; then make a decision as to how a change in P, V, T, or due north volition bear upon the starting quantity,
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How-do-you-do guys was Raymond here and today we're going to review how to practice PV T and n problems this is from the packet that you got on Wednesday October 16th and then if yous were here you'll exist able to follow along with what you've already gotten done if y'all were not here so yous can fill it in as we're going and make certain that you break and rewind if you're not understanding something okay so allow's offset we're going to commencement with question 2 it'due south a question 2 says that we have a bicycle tire and this bicycle tire is at 105 psi then you want to think about what that hundred and v psi is that 105 psi is the initial pressure considering we know that psi is the unit for pressure so it tells us that it'southward at 25 degrees Celsius well 25 degrees Celsius is temp merely we have to think that we want to add together 273 so that we get Kelvin and that gives us 298 Kelvin and that'southward because all of our gases any gas equation that we use we have to utilise Kelvin temperature and not Celsius just like what we did in the lab we saw that we didn't get 0 zero point on our graphs with Celsius but we exercise with our Kelvin okay if we keep going we see that information technology says you have the bicycle upwards to Huntington where the temperature is negative 5 again add together 273 and this time we get 268 Kelvin so that means that the final storm to 68 Kelvin now information technology wants to know what is the pressure in the tires so that's our question mark here it also tells united states of america that V and north are constant so if V and n are constant that means that we can actually simply kind of cross them out now our concluding step that nosotros're going to exercise is we take to look at this and we take to retrieve to ourselves okay well what's actually happening to the temperature the temperature you can meet here goes from 298 to 268 so that means that it goes downwardly and then we just draw a downwards pointer correct hither okay nosotros describe a downwards arrow now if temperature goes down it tin write little notes to ourselves if we go down in temperature then what happens to pressure well pressure and temperature every bit you remember is a direct relationship so if temperature goes down that means pressure level is going to go down and then if pressure is going to get down then we can get ahead and commencement with our problem we're going to solve for P final or p2 even so you want to telephone call it they could call initial every bit one final this too and so P concluding is 105 psi times and then we want a ratio now that ratio can be either 298 over 268 or information technology can exist 268 over 298 well we want to look back and see okay well we want our pressure to go downwardly and so look at these ii and figure out which 1 of these would make the force per unit area go down if we multiplied it by alright if you said this one you were correct so the 268 is what nosotros want to use to practise this trouble we desire to employ that ratio then to do this we're going to go ahead and we're going to plug in the 268 over 298 at present those are both Kelvin we don't really have to put the unit of measurement's there because they abolish now when yous multiply and you carve up you lot go your answer here and that answer is going to be in the units...
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