EK 1001 Chemistry

[agill786]

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Hi, I decided to take a look at this Chem book I have not used in a LONG time.

For question 162, why can't the relationship between pressure and volume be perfectly constant, isn't because PV=nRT and the P/V ratio would be the slope so it would be slightly parabolic?

Thanks!

 

[inno89]

http://www.phy.ilstu.edu/slh/Common Graph Forms.pdf

The second graph explains it exactly as you would like to. In the PV = nRT equation, the nRT can be simplified to a constant C. So, PV = C, and either transforming it to P = C / V or V = C / P should alarm you that this will be a parabolic graph. Since V is the independent (x-axis) variable in this case, you should simplify it to P = C / V and see that as V increases, the whole C/V term (which is equal to P) gets smaller. Thus, since you know it is parabolic and decreasing, the only answer choice is C.

 

[agill786]

http://www.phy.ilstu.edu/slh/Common Graph Forms.pdf

The second graph explains it exactly as you would like to. In the PV = nRT equation, the nRT can be simplified to a constant C. So, PV = C, and either transforming it to P = C / V or V = C / P should alarm you that this will be a parabolic graph. Since V is the independent (x-axis) variable in this case, you should simplify it to P = C / V and see that as V increases, the whole C/V term (which is equal to P) gets smaller. Thus, since you know it is parabolic and decreasing, the only answer choice is C.

Thanks!