Search results

  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?

    Thank you for the explainations :) That really helps!
  3. 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!
  4. 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...
  5. 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...
  6. 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...
  7. J

    [Chemistry] Another electrochemistry question

    so in this case, k is 1.1×10^16? cause when i try the quadratic on the internet quadratic solver, it says the answer is an imagary number....
  8. J

    [Chemistry] Another electrochemistry question

    but since the k is such large number, [Ce4+] is going to be large too right?
  9. 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...
  10. 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...
  11. 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.
  12. 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.
  13. 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...
  14. J

    PKa of Phenol

    what about the ratio of phenol and phenoate? is that mean the ratio of concentration?
  15. 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...
  16. 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...
  17. J

    I don't understand this integral

    nevermind , i got it
  18. J

    I don't understand this integral

    this is the process i got so far (x^2/2)((y^2-x^2)^(3/2))/(3/2)(-1/x^2) but one thing i don't understand, for the (-1/X^2), is this a proper intergral step?
  19. J

    I don't understand this integral

    what about this one? how do you integrate x(y^2 - x^2)^(1/2)? my TA says the answer is (-1/3)((y^2 - x^2)^(3/2)) but i don't get where is the (-1/3) comes from....
  20. 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!
  21. 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%...
  22. 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.
  23. J

    How to calculate the comet's speed?

    i got the answer, thank you so much! btw, so does that mean if for similiar questions, the M is always M of sun?
  24. J

    How to calculate the comet's speed?

    one question, when we calculate with the K2 + U2 = K1 + U1, the M we are using, is that the mass of the sun or neptune?
  25. 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...
  26. J

    Calculus-taylor series

    okay so in that case -|x| < 1 is wrong right?
  27. J

    Calculus-taylor series

    thank you so much by the way, one side question, can R be negative?
  28. J

    Calculus-taylor series

    o..... okay so in general, if we want to know the equation for An to do the ratio test, the An equation we need is derive from the f^(n)(x) pattern right?
  29. J

    Calculus-taylor series

    okay, i think i start to get it......what you saying is using the equation derive in part a) right?
  30. J

    Calculus-taylor series

    but what i don't understand is, when you do the ratio test lim |An+1/An| don't you need an equation involving n? for example like n^x/(n+1)
Top