Delli

Most popular questions and responses by Delli
  1. Physics

    Light that is polarized along the vertical direction is incident on a sheet of polarizing material. Only 94% of the intensity of the light passes through the sheet and strikes a second sheet of polarizing material. No light passes through the second sheet.

    asked on February 15, 2009
  2. cHEMISTRY

    How many electrons are in the p-orbital of the methyl radical (CH3^.)

    asked on November 25, 2007
  3. Physics

    A car makes a trip due north for three fourths of the time and due south one-fourth of the time. The average northward velocity has a magnitude of 27m/s, and the average southward velocity has a magnitude of 17m/s. What is the average velocity, magnitude

    asked on September 14, 2008
  4. Physics

    a 300kg piano is being lifted at a steady speed from ground level straight up to an apartment 10.0m above ground. The crane that is doing the lifting produces a steady power of 400 W. How much time does it take to lift the piano?

    asked on November 25, 2008
  5. CHEMISTRY

    How many electrons does the p-orbital of a methyl radical carbon CH3^. contain?

    asked on November 25, 2007
  6. CHEMISTRY FOR DR. BOB or anyone else

    A hypothetical weak acid HA, was combined with NaOH in the following proportions: 0.20 mol HA, 0.08 mol NaOH. The mixture was then diluted to a total volume of 1L, and the pH measured. (a) If pH=4.80, what is the pKa of the acid (b) how many additional

    asked on May 11, 2007
  7. Chemsitry II

    mole fraction is equal to partial pressure divided by the total pressure Total pressure= sum of partial pressure use PV=nRT where n= number of moles equation become PV/RT=n make sure to convert the temperature to Kelvin and to use 0.0821 for R. V=volume,

    asked on May 10, 2007
  8. CHEMISTRY

    How many moles of Calcium chloride can be added to 1.5L of 0.020potassium sulphate before a precipitate is expected? Assume that the volume is not chnaged significantly. CaSO4 ==> Ca^+2 + SO4^= Ksp = (Ca^+)(SO4^=) = ??. Look it up. (SO4^=) = 0.02 M Use Ksp

    asked on May 14, 2007
  9. Chemistry

    How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.

    asked on November 25, 2007
  10. CHEMISTRY

    The pKa values of acetylene, ehtylene and ethane are 25, 44 and 50 respectively. This means that acetylene is the strongest acid of the three.Explain the order of acidity for the above hydrocarbons

    asked on November 4, 2007
  11. Physics Again

    In 1954 the English runner Roger Bannister broke the four minute barrier for the mile with a time of 3:59.4s (3 min and 59.4 sec) In 1999 the Morroccan runner Hicham set a record of 3:43.13s for the mile. If these two runners had run in the same race, each

    asked on September 14, 2008
  12. CHEMISTRY

    How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how it is 3.

    asked on November 25, 2007
  13. CHEMISTRY

    Is it possible to obtain pure (200-proof) ethanol using fractional distillation from a fermentation mixture that contains equal amounts of water and ethanol? Explain your answer. I know that some water will still remain i would just like to know why some

    asked on September 21, 2007
  14. CHEMISTRY

    Is it possible to obtain pure (200-proof) ethanol using fractional distillation from a fermentation mixture that contains equal amounts of water and ethanol? Explain your answer.

    asked on September 20, 2007
  15. Chemistry

    What does the ozonolysis followed by hydrolysis of an unsymmetrical, unbranched alkene form?

    asked on November 26, 2007
  16. CHEMISTRY FOR DR. BOB or anyone else

    A hypothetical weak acid HA, was combined with NaOH in the following proportions: 0.20 mol HA, 0.08 mol NaOH. The mixture was then diluted to a total volume of 1L, and the pH measured. (a) If pH=4.80, what is the pKa of the acid (b) how many additional

    asked on May 11, 2007
  17. CHEMISTRY

    C12H20(Y)--> 22CH2=O+ 2CH3C(=O)CH2C(=O)CH3 The reagents used are ozone, Zn and H20 Give condensed formula of C12H20Y

    asked on November 12, 2007
  18. CHEMISTRY

    pH= 7.44 What is the ratio of [H2PO4^-]/[HPO4^2-] What does the pH become if 25% of the hydrogen phosphate ions are converted to the dihydrogen phosphate ion? What does the pH become if 15% of the dihydrogen phosphate ions are converted to hydrogen

    asked on May 10, 2007
  19. Chemistry

    A 0.00400- mole sample of 2-chloro-2methylpropane is added to 150Ml of water, and the mixture is stirred till the p H levels off. What is the p H of the solution?

    asked on November 12, 2007
  20. CHEMISTRY HELP DR.BOB

    WHAT IS PK2? pK2 for H3PO4. Look in your text for k2 for H3PO4. My text, but it's an OLD OLD one lists k2 of 6.2E-8 and pK2 = 7.21. DRBOB. It is the same in my reference as well, 6.23E-8 or pK2=7.21 at 25C.

    asked on May 10, 2007
  21. CHEMISTRY HELP PLEASE

    when I use henderson-hasselbach Ka of HOP4^2- = 4.8 x10^-13 pKa= -lg(4.8 x10^-13)=12.3 substituting I get 7.44-12.3 = lg [base/acid] e^-4.86=[base/acid}= 7.75 x10^-3 according to my textbook this answer is incorrect and should be 0.59 Please Help! IF you

    asked on May 10, 2007
  22. CHEMISTRY

    pH= 7.44 What is the ratio of [H2PO4^-]/[HPO4^2-] What does the pH become if 25% of the hydrogen phosphate ions are converted to the dihydrogen phosphate ion? What does the pH become if 15% of the dihydrogen phosphate ions are converted to hydrogen

    asked on May 10, 2007
  23. CHEMISTRY

    Calculate Kp at 500 deg C for the reaction- 4No2+6H2O 4NH3+5O2. The value for Kc at 500 deg C is equal to 0.456. Kc = KpRT-delta n where delta n = ngas products - ngas reactants

    asked on May 12, 2007
  24. Chem for Dr.Bob

    I still don't understand how to caluculate the number of electrons in the p-orbital. Where do the other two electrons come from to make it three

    asked on November 25, 2007
  25. Chemisty Please Help

    I still don't understand how to caluculate the number of electrons in the p-orbital. Where do the other two electrons come from to make it three

    asked on November 25, 2007
  26. FOR DR. BOB

    With regards to my last question about the acid. Just to clarify, the [HA] that I should use is 0.12 which is the concentration of acid-concentration os base? right. (HA) = 0.12 [that's 0.20 - 0.08 = 0.12). And the base, which is (A^-), is 0.08, or course.

    asked on May 11, 2007
  1. CHEMISTRY

    How many electrons are there in the p-orbital of a CH3 RADICAL (CH3.) I don't understand how to count 3.

    posted on November 25, 2007