Yoo

Most popular questions and responses by Yoo
  1. chem

    rank strongest acid to weakest acid? rank strongest acid to weakest acid H3CNH2 CH3C (triple bond) CH CH2=CHCH3 H20 CH4 i tried to rank them using the Pka values but I couldn't find the pKa value of the alkyne and I thought the H3CNH2 was the strongest but

    asked on February 15, 2011
  2. chemistry

    Tarnished silver contains Ag2S. The tarnish can be removed by placing silverware in an aluminum pan containing an inert electrolyte soln, such as NaCL. Explain the electrochemical principle for this procedure, [The standard reduction potential for the

    asked on July 27, 2010
  3. organic chemistry

    in gas chromatography, why do E1 and E2 give different peaks (areas) though it's the same compound?? For example, for 1-butene, the percent composition is low in E1 but very high in E2.

    asked on January 24, 2011
  4. chemistry

    Describe the electrolysis of an aqueous soln of KNO3

    asked on July 27, 2010
  5. organic chemistry

    what product is formed from 1-bromo-2 methyl-cyclohexane reaction with CH3ONa and CH3OH...from a substitution reaction ...I got 1-CH3OH-2methly-cyclohexane but it's wrong. Not sure how to do it

    asked on January 19, 2011
  6. math

    A car drives down a road in such a way that its velocity ( in m/s) at time t (seconds) is v(t)=2t^1/2 +2 . Find the car's average velocity (in m/s) between t=4 and t=9. i really need help with thisss

    asked on January 29, 2011
  7. organic chem

    what are some chemical reasons that might have resulted in a lower yield of a product on a grignard reaction. Something related to grignards being very reactive and since its the limiting reagent, any reaction that destroys it will result in a hit in

    asked on February 28, 2011
  8. chemistry

    for oxidation number of Fe(CO)5 I don't understand why Fe is zero

    asked on July 27, 2010
  9. organic chemistry

    in gas chromatography, why do E1 and E2 give different peaks (areas) though it's the same compound?? dehydration of a secondary alcohol proceeds readily with the presence of strong acid and proceeds with E1 mechanisms. Removing product from chemical system

    asked on January 24, 2011
  10. chemistry

    A hypothetical diprotic acid has pKa1=5 and pka2=7. Could a buffer at pH6 be prepared with this acid? If so how?

    asked on July 27, 2010
  11. calc

    f(x)=3x^ln(x), find f '(9). i can't find the answer :( I got 3x^lnx(((ln(lnx))/x)+ 1/lnx)

    asked on February 18, 2011
  12. chemistry

    I did a lab about melting point. It is asking me for the purity of the compounds? How do I find it? Do I use melting points or percent yield?

    asked on October 5, 2010
  13. bio

    Supercoiling of DNA can occur (choose all that apply): A. when double stranded DNA is overwound B. when double stranded DNA is underwound C. when double stranded DNA is heated above it's Tm D. when DNA is treated with nucleases and Generally, cellular DNA

    asked on April 4, 2011
  14. bio

    Supercoiling of DNA can occur (choose all that apply): A. when double stranded DNA is overwound B. when double stranded DNA is underwound C. when double stranded DNA is heated above it's Tm D. when DNA is treated with nucleases and Generally, cellular DNA

    asked on April 4, 2011
  15. calc

    f(x)=6(sin(x))^x, find f'(1). and f(x)=3x^ln(x), find f'(9). i tried these so many times and it keeps telling me that my answers are wrong :/ for the first one i did f'(1) = 6sin(1) * {ln[sin(1)] + cot(1)}., is that correct, when i put it in my calculator

    asked on February 18, 2011
  16. math

    Find the volume of the solid obtained by rotating the region bounded by the given curves about the specified axis. x=2y^2 , y=1 ,x=0 about the y-axis

    asked on January 29, 2011
  17. Chemistry

    calculate the ph 25.00 mL solution of 0.125 M acetic acid (Ka= 1.75 x 10^-5) after the addition of each of the following volumes of 0.100 M KOH: 10.00 mL, Vep and 35.00 mL

    asked on April 21, 2013
  18. chem

    what other experiments or techniques can be used in replace of infrared spectroscopy

    asked on February 15, 2011
  19. chem

    standard free energy change of -11.70 kJ mol-1. Calculate equilibrium constant for 25 degrees C. I got 7.772..and it's wrong I did -11700J/ (-2.303 x 8.314 x 298)= 2.0505277 and then e^(2.0505277)= 7.77 I don't know what I did wrong

    asked on December 3, 2010
  20. english

    What does relocalization within this text? what does relocalization mean within this text "A sane urbanism has to mean an intense commitment to RELOCOLIZATION, specifically to local economies. It means not spending $8 billion dollars to expand highway

    asked on September 29, 2010
  21. chemistry

    is melting point of 120-126 C a typical range for a melting point

    asked on September 28, 2010
  1. Math 6th Grade

    answers?

    posted on May 31, 2019
  2. ELA 10

    the responses LOLLL but thank u @need help

    posted on May 18, 2019
  3. Math cca

    UnderSwap Paps are you 100% correct

    posted on February 4, 2019
  4. Math

    I just solved the first question which is D so I'm guessing either Hannah gave out the wrong answers or the test changes its questions.

    posted on March 9, 2018
  5. Math

    I just solved the first question which is D so I'm guessing either Hannah gave out the wrong answers or the test changes its questions.

    posted on March 9, 2018
  6. Physics

    20m

    posted on September 24, 2015
  7. calculus

    To find the concavity just graph it or use the first derivative and pick values greater than, or less than your critical points see if those values are positive or negative. IF positive, the graph will concave up, if negative - concave downwards. To find

    posted on November 11, 2012
  8. organic chemistry

    dehydration of a secondary alcohol proceeds readily with the presence of strong acid and proceeds with E1 mechanisms. Removing product from chemical system at equilibrium shifts the equilibrium in the direction favoring the formation of the products. I

    posted on January 24, 2011
  9. organic chemistry

    so it is because acidic and basic conditions are used...but I'm still unsure how that gives different product ratios.

    posted on January 24, 2011
  10. chem

    thank you!

    posted on December 4, 2010