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  1. J

    Bromination and Nitration

    Homework Statement 1) What other nitration products in a electrophilic nitration of benzoic acid would be formed if each reaction were carried out at a higher temperature? 2) The nitration of hydroquinone leads to a low yield of nitrohydroquinone. Propose the structure of the major product...
  2. J

    Is there any difference between Miscible and Soluble?

    Are there any differences between the terms Miscible and Soluble? I am kind of confuse between these two terms. Are they interchangeable? Thank you!
  3. J

    [Chemistry Lab] Isolation of Aldehyde and Carboxylic Acid

    [Chemistry Lab] Cannnizzaro Reaction Hi! I am having some questions about my chemistry lab. In the lab we are given 1 of the 5 unknown aldehyde (benzaldehyde, anisaldehyde, nitrobenzaldehyde, chlorobenzaldehyde, and dimethoxybenzaldehyde) and reacts it with methanol and KOH to undergo...
  4. J

    [Chemistry] Calculation of Pt potential

    Homework Statement Calculate the potential of a Pt electrode immersed in a solution that is 0.0263M in K2PtCl4 and 0.1492M in KCl. The answer given in 0.78 Homework Equations E = Eo - 0.05912/2 * log Q (Nernst Equation) The Attempt at a Solution We try looking at the reduction of PtCl4...
  5. J

    Mass balance/Charge balance

    Can somebody explain how do you write a Mass Balance or Charge balance for a acid-base equilibrium? Let say, if you are given 0.01M Zn(OH)2 in a saturated NaOH solution and also given that Zn(OH)2 + 2OH- -> Zn(OH)4(2-) how would you solve the mass balance/charge balance? I really have no idea...
  6. J

    [Chemistry] Another electrochemistry question

    1. Homework Statement Given the following half-reactions: Ce4+ + e− → Ce3+ E° = 1.72 V Fe3+ + e− → Fe2+ E° = 0.771 V A solution is prepared by mixing 7.0 mL of 0.30 M Fe2+ with 8.0 mL of 0.12 M Ce4+. Calculate [Ce4+] in the solution. I've got the potential of a platinum electrode...
  7. J

    [Chemistry] Membrane Potential

    [Chemistry] Another electrochemistry question Homework Statement Given the following half-reactions: Ce4+ + e− → Ce3+ E° = 1.72 V Fe3+ + e− → Fe2+ E° = 0.771 V A solution is prepared by mixing 7.0 mL of 0.30 M Fe2+ with 8.0 mL of 0.12 M Ce4+. Calculate [Ce4+] in the...
  8. J

    Electrochemistry question

    What is the different between spontaneous reduction and spontaneous oxidation? For spontaneous reduction you need to have Ecell to be (+), then what about spontaneous oxidation? Thanks.
  9. J

    Questions about Diels Alder reaction

    I am doing a research on Diels Alder, and I just want to know what are some of the history and applications of Diels Alder? Thank you.
  10. J

    PKa of phenol lab

    Homework Statement I am working on a lab about pKa of phenol, and I don't understand how to do the following questions. Can someone please kindly help me?? 1) Why was the rinsing of glassware with acetone not allowed in this experiment? T/F Acetone has a UV absorption itself and causes...
  11. J

    PKa of Phenol

    please help!!!! questions on pKa of Phenol Hi, I have some questions regarding the pKa of Phenol lab that I am working on right now. 1) What would cause the absorbance curves to not go through the isosbestic point? For this one, I know that isosbestic point is not pH dependent so pH won't...
  12. J

    [Chemistry] How do you find the new concentration?

    Homework Statement For solution A the concentration is 7.00x10^-4 mol/L. You transfer 10ml of the solution A out into a 10 dram vial and add 10mL of 0.1M HCL acid solution, and the new mixture is called solution B. What is the concentration of solution B? Homework Equations The Attempt...
  13. J

    I don't understand this integral

    I don't understand for integral ysin(xy)dx = -cos(xy) for a=1 b=2. I know sin's integral is cos, but I don't understand how to eliminated the y in the left equation so it become the right equation. Please help!
  14. J

    Analytical Chemistry involving buffer

    Homework Statement What volume of 0.200M HCl must be added to 250.0ml of 0.300M sodium mandelate to produce a buffer solution with a pH of 3.37? Homework Equations The Attempt at a Solution For 2 and 3, can I use the equation pH = pKa + log [A-/HA]? but for HCl isn't that 100%...
  15. J

    Need help with Trig/angle question

    For example: if i have a point (1, -1) in the forth quadrant of the xy plane. How do you convert it to angle = [7(pie)/2]+2n(pie) format? i just forget how to do that part. Also, what if the answer for tan-1(angle) is not a whole #, ex: 53.1, then how do you do the conversion? Thank you.
  16. J

    How to calculate the comet's speed?

    Homework Statement Comet moves around the sun in a very ellipical orbit around the sun. As it approach, in 1986, Comet Halley was 8.79x10^7km from the sun and moving with a speed of 54.6km/s. What will be the comet's speed be when it crosses Neptune's orbit in 2006? length of comet from...
  17. J

    Is it possible for radius of convergence to be negative?

    is it possible for "R" (radius of convergence) to be negative? is it possible for "R" (radius of convergence) to be negative? for example: -|x|<1 and R=-1?
  18. J

    Need some help to get started

    Consider the function f(x) = ln(1-x) a) compute the MacLaurin series of f(x) (ie: the Taylor series of f(x) around x=0) b) Compute the radius of convergence and determine the interval of convergence of the series in a) c) Determine the Taylor series of f'(x) around x=0. Can you do so...
  19. J

    What is the comet's speed at the midpoint?

    A binary star system has two stars, each with the same mass as our sun, separated by 1.10×1012 . A comet is very far away and essentially at rest. Slowly but surely, gravity pulls the comet toward the stars. Suppose the comet travels along a straight line that passes through the midpoint between...
  20. J

    Series with positive terms

    Let (infinity)(sigma)(n=1) = An be a series with positive terms such that lim(n -> infinity) = (An+1)/(An) = L < 1 a) Let L < r < 1. Show that there is an N > 0 such that for all n > N, we have (An+1)/(An) < r b) Show that Ak+N < or = ANr^k for k = 1, 2.... c) Show that lim (k ->...
  21. J

    Series question

    Hi, I just wondering if someone can help me on this question. 1) 1/(n(ln n ) ^p) 2) 1/((n(ln n)(ln (ln n))))^p Both are b = infinity and a = 1 for the integral signs. The question is for what value of p>0 does the series converges and for what value does it diverges. Thank you !!!
  22. J

    How do you solve the cos(x)?

    Given the following image and formula: cos(x) = (vi)/(vf+V9) how do you find the value for each of the velocity??? I try using Pythagoras theory for the triangel but no use....
  23. J

    How to do this question?

    If you were given vector A times vector B equals -10 and vector A times vector B = ABcos(x), how do you find x? also what plane is vector A and vector B on?
  24. J

    How to do this integral?

    How to do this integral? dy/dx = (y^2 - 1)/x a) Give the general equation of the curves that satisfy this equation b) Show that the straight lines y=1 and y=-1 are also solutions. Thank you!!!!
  25. J

    What's the different between a 'converge' and 'diverge' integral?

    What's the different between a 'converge' and 'diverge' integral?
  26. J

    How do you integrate the following questions?

    How do you integrate the following questions? 1) x/((3-x^4)^(1/2))*dx 2) (1+e^x)/(1-e^x)*dx 3) (xlnx)/((x^2-1)^(1/2))*dx thank you so much!!!
  27. J

    How do you know when it's time for Trignometric Subsitution ?

    How do you know when it's time for "Trignometric Subsitution"? How do you know when it's time for "Trignometric Subsitution"?
  28. J

    How to do integral for Cos(x^2)dx?

    How to do integral for Cos(x^2)dx? Is there a chain rule for integral? Coz sometimes when I approach questions like that i just don't know how to approach....thanks!
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