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  1. J

    I know that when you hyperventilate, the Pco2 in blood decreases

    I was initially thinking arterial CO2 because after you blow a lot of it out through hyperventilating, less CO2 would be left to go to the body... but I'm not exactly sure :S
  2. J

    I know that when you hyperventilate, the Pco2 in blood decreases

    I know that when you hyperventilate, the Pco2 in blood decreases... but is it the venous or arterial PCo2 that's decreasing? Can someone please clarify this? Thank you!
  3. J

    Questions about oxygen level in humans

    1. The % of hemoglobin bound with Oxygen is different at high and low carbon dioxide concentrations when the partial pressure of O2 equals 0mm Hg True or false?? This should be false right...? if partial pressure is 0... Hb can't bind to any oxygen in the first place... is my reasoning...
  4. J

    Please help! ion channels? voltage?

    Whole-cell patch clamp electrophysiology can be used to record: a. the activity of the ion channels that are present in the patch of membrane. b. the activity of multiple neurons at a given time. c. voltage and/or current across the membrane of a cell. d. multi-unit activity...
  5. J

    Some questions about neuro stuff

    Whole-cell patch clamp electrophysiology can be used to record: a) the activity of the ion channels that are present in the patch of membrane b) the activity of multiple neurons at a given time c) voltage and/or current across the membrane of a cell d) multi-unit activity My guess: c...
  6. J

    Data acquisition for waves

    well that's the problem... cuz 450 is not in the choices.. :( what do you think the best choice is...???
  7. J

    Data acquisition for waves

    If your MP100 is recording at 10 sps and your input analog signal is at 100Hz, how many waves would the data acquisition miss in a 5 s recording? a. 50 b. 1000 c. 25 d. 500 e. 100 This means that you're sampling every 10 cycles. Then you miss 9/10. so once it goes through 100 cycles...
  8. J

    Maclaurin series coefficient

    hmm i'm still not too sure... I do get the series u've written above... now for sinx i expand it like x - x^3/3! + x^5/5!... up to the fourth order.... and plug in 0??.... doesn't that just make everything equal to 0.....????
  9. J

    Maclaurin series coefficient

    Homework Statement find coefficient of x^4 in the MAclaurin series for f(x)=e^sinx Homework Equations ok... so taking derivatives 4 times for this function.....gave me a mess!!! @.@ can someone help me in simplying the derivatives...? 1. cosxe^sinx then for 2. is it...
  10. J

    Series; convergence, divergence

    ohhhh i get it now~~ thank you!! ^^ can anyone help me on inverse trig series that i've written above?? :S also... i think i made some mistake again in using the ratio test for this question: sum(infinity, n=1) (-1)^n((5^2n)/n!) i end up with lim(25/n+1)... and it's supposed to be...
  11. J

    Series; convergence, divergence

    series; convergence, divergence.... Homework Statement 1. sum(infinity,n=1) n!/1.3.5...(2n-1) 2. sum(infinity, n=1) (-1)^n arcsin(-1/n) 3. sum(infinity, n=0) arcsin(1/n^2) / arctan(1/n^2) The Attempt at a Solution 1. i used the ratio test and then i ended up with lim((n+1)(2n-1)/2n+1))...
  12. J

    Integral problem

    so if y = 2sinb then dy = 2cosbdb hence 1/2(integral]0->2f(y)dy) = 1/2(6) = 3 Is this the answer?
  13. J

    Integral problem

    suppose that f is continuous and (integral]0->2 f(x)dx = 6. Then (integral]0 -> pi/2 f(2sinb)cosbdb=? ok.... i'm totally lost here... how do u solve this without knowing what f(x) is..????
  14. J

    Arclength question

    this is a really easy question... but seems like i keep getting something wrong in my calculations... - - Find the arclength of y = x^3/2 0<x<5/9 when i do it using the formula; L = sqreroot (1+(dx/dy)^2) i keep getting one... can someone post the calculation process.....
  15. J

    Rolling motion?

    A uniform, spherical bowling ball of mass m and radius R is projected horizontally along the floor at an initial velocity v0 = 6.00 m/s. The ball is not rotating initially, so w0 = 0. It picks up rotation due to (kinetic) friction as it initially slips along the floor. The coefficient of...
  16. J

    Separation of solid mixture by extraction

    Hi, I have a question about separation of solid mixture by extraction. so how can you tell what reacts with what and which layer contains what? k for example, if you have a mixture of phenol and salicylic acid, first the mixture is dissolved in diethyl ether... then the solution is mixed with...
  17. J

    Energy barrier?

    What's an energy barrir to rotation? I have data on the enrgy at anti and gauche conformations of 1-iodopropane. I have also graphed the data (steric energy vs dihedral angle) from the graph, do I just subtract the trough at anti from the trough at gauche? so from anti to gauche, it'd be...
  18. J

    Melting point and solubility in water of benzoic acid

    noo... we haven't covered any of that... since it's organic. hmm... those equations will make me look smart for sure :P but I don't think they want to see calculations... more a theoretical interpretation...
  19. J

    Melting point and solubility in water of benzoic acid

    yes this is for organic chem lab... and.. I'm not getting it... :(
  20. J

    Gauche and anti of n-butane

    so the reason why there's less energy difference for 1-iodopropane... is that I is a less bulkier group, and the bond length with C is longer??
  21. J

    Melting point and solubility in water of benzoic acid

    in literature, find melting point and solubility in water of benzoic acid, vanillin, phthalic acid, salicyclic acids. Calculate the expected volume of hot water that would be requried to dissolve 0.15g of each compound. With info on melting point and solubility in water... how can you...
  22. J

    Gauche and anti of n-butane

    no... the question stated that the difference between gauche and anti of n-butane is 3.6kJ/mol... not kcal/mol...
  23. J

    Gauche and anti of n-butane

    so since they're farther apart, there's less energy..?? oh... I just thought iodine was bulkier... cuz.. it has a higher atomic number.... nope... maybe not... lol ohh if methyl groupd is bulkier, it makes sense that it has a higher energy difference... please clarify for me..!! > . <
  24. J

    Gauche and anti of n-butane

    ok to clarify i'm comparing the energy difference between gauche and anti of n-butane and 1-iodopropane not butane...- -;; what was i thinking... anyways, I just think that there'd be more energy difference when there is Iodine because it's a bulkier group... hence more steric strain... but it...
  25. J

    Gauche and anti of n-butane

    The difference in energy between gauche and anti of n-butane is 3.6kJ/mol. For the molecule iodobutane, I found the differnece in energy between the gauche and anti to be about 0.62KJ/mol... What accounts for this difference??? and also, when you're asked to find the energy barriers to the...
  26. J

    What is the geometry of dichloromethane?

    hmm i'm confused... aren't the IPr groups for all three isomers pushing against =CH2 regardless of how they're arranged?
  27. J

    What is the geometry of dichloromethane?

    1. Does the bond angle change to reduce steric strain maybe?? and we measured the C-Cl bond length which was about 1.76 whereas after optimization, it went up to about 1.79A. So again, does making the bonds be farther apart make it more stable?? 2. ok the bond angle of C=C-C was measured for...
  28. J

    What is the geometry of dichloromethane?

    organic chem!! What is the geometry of dichloromethane?? Before optimization, Cl-C-Cl bond is 109.5, H-C-Cl bond is 67.8... so it must be tetrahedral... but after optimization, do the angles get bigger?? why? and also, the bond length increases... Why do angles and the bond length in...
  29. J

    Bond angles

    How is the bond angle for Cl-C-Cl in dichloromethane different from H-C-H bond angle of CH4? Is it smaller??
  30. J

    HELP NEEDED ! regarding distillation.

    HELP NEEDED!!!!!! regarding distillation................ Hi I am in need of desperate help with chemistry... So we did a simple distillation of an unknown alcohol and after the distillation, we were to identify what the alcohol is.. My result was that i got my first drop of distillate at...
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