Recent content by amit25

  1. A

    Specific Rotation of 4-Methoxy-d-Mannose in Tetrasaccharide Hydrolysis

    Thanks, hmmm..im not sure if we're expected to make some assumptions but that's how the Question was worded exactly.
  2. A

    Specific Rotation of 4-Methoxy-d-Mannose in Tetrasaccharide Hydrolysis

    Homework Statement The specific rotation of a tetrasaccharide was measured to be -20.5°. Upon complete hydrolysis in acid the optical rotation of the solution was found to be -36.9°. Knowing that the specific rotations of n-acetylgalacosamine,3-deoxy-l-fucose and 2-deoxy-D-ribose are...
  3. A

    Calculating Concentrations of CrCl(OH2)5+2 and Cr(OH2)6+3

    Homework Statement 10 mL solution of 0.5 M CrCl(OH2)52+ is allowed to aquate to Cr(OH2)63+. To determine an approximate rate of reaction, the amounts of CrCl(OH2)52+ and Cr(OH2)63+ present after a certain period of time are evaluated. This is done by pouring the solution on a cation exchange...
  4. A

    Calculate molar conductivity of Co(NH3)4CO3]NO3?

    Homework Statement This was determined from an experiment,where the resistance of 0.02M of KCl was to be determined [KCl]=0.02M conductance=2.86ms L=0.002768ohm^-1 to obtain k Co(NH3)4CO3]NO3 : conductance: 1.923ms concentration of cobalt complex: 0.002M Homework Equations k=RL...
  5. A

    How Do You Calculate the Wavelength of an Electron Transition in a Helium Ion?

    should i use this ΔE = RchZ²{1/n²(1) - 1/n²(2)} where R is the Rydberg constant (1.0974 x 10E7 m-¹); c the speed of light in vacuum (2.9979 x 10E8 m s-¹); h Planck's constant (6.626 x 10E-34 J s); Z nuclear charge; n(1) & n(2) are the principal quantum numbers of the electron transition
  6. A

    How Do You Calculate the Wavelength of an Electron Transition in a Helium Ion?

    Homework Statement He+ ion consists of a nucleus which is an alpha particle plus one orbiting electron.Hence it has a net positive charge. a)Derive an expression for the electron state energies b)what is the wavelength associated with a transition between the lowest two energy states...
  7. A

    Constructive Interference of Sound waves

    i think r is suppose to represent distance. The question gives me the formula in terms of r I guess my question is if my calculations are correct? Not sure if I am on the right track. I am not sure how many answers to give I wasnt told but I calculated up to 3.
  8. A

    Constructive Interference of Sound waves

    Homework Statement A pair of speakers connected to the same signal generator face each other, one at x=0 and the other at x=1.5m. If they are producing a sound frequency of 2000Hz what are the points (position x) of constructive interference between the speakers? Express your answer in...
  9. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    lol well i have a sheet we got with all the notes and frequency so i don't think were expected to memorize them, anyways thanks i feel like this is going no where ill just ask my professor
  10. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    from here not sure which octave anyways i think its wrong the answer should still be C http://www.sengpielaudio.com/calculator-… Scroll down to "Frequency to Musical Note Converter".
  11. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    so 2.7 x 262hz=707hz so that's F5 note ?
  12. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    those are the same values i just researched to get more accurate values
  13. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    927 is the speed of helium and 343 is the speed of sound
  14. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    Wavelength in helium λ = c / f = 927 / 262 = 3.538 m. Wavelength in air λ = c / f = 343 / 262 = 1.309 m. Ratio = 3.538 / 1.309 = 2.7
  15. A

    What note does a listener hear when a singer gulps helium and sings middle C?

    233Hz/294Hz=0.80 which is less than the wavelength ratio