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October 25, 2014

Posts by Chemgam


Total # Posts: 36

chemistry
E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 frecuency(hz)= E / h
January 12, 2013

chemistry
b) 0.551
January 12, 2013

chemistryy
E = P^2/2Me + E(first ionization) P= h / BroglieWavelength E(first ionization)=21.7*10^-19 Me= 9.1*10^-31 h= 6.626*10^-34 frecuency(hz)= E / h
January 12, 2013

Chemistry
b) 0.551
January 12, 2013

science
b) 0.551
January 12, 2013

Chemistry
Same here. Received a red X on the answer.
January 11, 2013

chem
2.8*10^-4
January 11, 2013

Chemistry
a)4.27*10^-6 b)536.7
January 11, 2013

Chemistry
Jasmin, Thank you for the explanation.
January 11, 2013

CHEMISTRY
0.435
January 11, 2013

chemistry
13.8
January 11, 2013

Chemistry
2.8*10^-4
January 11, 2013

Chemistry
Had the answer from someone else and still awaiting the formula to double check.
January 11, 2013

Chemistry
a) 11.13 b) 10.76
January 11, 2013

Chemistry
any ideas on a)? b) A c) F d) D e) C, D, E f) E
January 11, 2013

chemistry
Anonymous is right! a)5.11 atm and -56.3 b) I c) 73 atm and 31.1 d) 1 atm -78.5
January 11, 2013

Chemistry
Thank you. (a) B E (b) B E (c) E (d) critical micelle concentration (e). Region B (f). 0
January 11, 2013

Chemistry
Thank you for a) Any ideas for (b) Which are likely to have much lower critical micelle concentrations? A B C D E (c) Which surfactant is more likely to form non-spherical micelles? A B C D E The surface tension versus concentration for a surfactant in aqueous solution is ...
January 11, 2013

Chemistry
Consider the following surfactants: (a) Which are nonionic surfactants? i) A ii) B iii)C iv) D v) E
January 11, 2013

Chemistry
The energy versus bond length for the average bond in two solids, A and B, is shown below. Atoms in the two solids have the same number of nearest neighbots. (a) Which solid has the largest cohesive energy? A or B (b) Which solid has the smallest bond energy? A or B (c) Which ...
January 11, 2013

Chemistry
Arginine O 2.01 H2N---CH--C----OH 9.02 CH2 CH2 CH2 NH 12.48 C==NH NH2 ________________________________________ 9.78 O 2.35 H2N----CH---C----OH CH3 Glycine ________________________________________ Shown above are images of two amino acids, along with the pKas of each of their ...
January 11, 2013

Chemistry
For each pair of compounds, identify the one with the higher boiling point. I)GeCl4 or SnCl4 II)PF3 or PF5 III)H2O or H2S
January 11, 2013

Chemistry
0.435
January 11, 2013

Chemistry
The vacancy fraction of a particular metal is found to double as the temperature of the metal is increased from 700 degrees C to 850 degrees C. Calculate the enthalpy of vacancy formation for this metal. Express your answer in units of eV.
January 11, 2013

Chemistry
Thank you for the explanation.
January 11, 2013

Chemistry
(a) Silicon (50 g) has been doped with 27 mg of antimony (Sb). Determine the concentration of free charge carriers (carriers/cm3) at room temperature in this material. (b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse ...
January 11, 2013

Chemistry
27*(4.891*10^-3)^4
January 11, 2013

Chemistry
(a) The solubility of bismuth iodide (BiI3) in water is 4.891 x 10-3 M. Calculate the value of the solubility product. The dissolution products are Bi^3+ (aq) and I^- (aq). (b) Do you expect the solubility of (BiI3) in 0.1 M NaCL (aq) to be equal to, greater than, or less than...
January 11, 2013

Chemistry
Identify the element that, acting as a target in an x-ray tube, generates Lα radiation of wavelength, λ, equal to 3.07 nm (3.07 x 10-9). i) Cu ii) Ni iii) Li iv) Ti v) K vi) Mo vii) W
January 11, 2013

Chemistry
Thank you a)3.03*10^-8 b) 2.14*10^-8 c) 33.2
January 11, 2013

Chemistry
(a) What is the distance between second nearest neighbor atoms in vanadium? Express your answer in cm. (b) What is the interplanar spacing between (110) planes in vanadium? Express your answer in cm. (c) At what angle must (110) planes of vanadium be exposed to a collimated ...
January 11, 2013

Chemistry
Shown below is a rough sketch of the unary phase diagram (pressure vs. temperature) for carbon dioxide , dry ice. Note the diagram is not drawn to scale and contains breaks in the axes to signify this. Using the diagram, answer the following questions: (a) Give the pressure (...
January 11, 2013

Chemistry
(a) Propylene, H2C=CH-CH3, can be reacted to form a polymer known as polypropylene (PP). What type of polymerization reaction is most appropriate for the formation of polypropylene? i)Addition Polymerization ii)Anionic Polymerization iii)Condensation Polymerization (b) What is...
January 11, 2013

Chemistry
(a) What is the pH of 50 mL of a 0.2M glycolic acid aqueous solution after adding 5 mL of 0.25 M KOH? The pKa of glycolic acis is 3.83 at 25 Celsius. (b) Classify each of the following compounds as either "acidic", "basic", or "amphoteric" (able ...
January 11, 2013

Chemistry
For AsClF4^2-: a)Name the hybridization of the orbitals of the central atom. i)s ii)sp iii)sp2 iv)sp3 v)sp4 vi)sp3d vii)sp3d2 b)Estimate the Cl-As-F bond angle. i)Slightly less than 90 ii)Exactly 90 iii)Slightly greater than 90 iv)Slightly less than 109.5 v)Exactly 109.5 vii)...
January 11, 2013

Chemistry
The rate constants for a first order decay reaction are found to be: K287.3C = 1 X 10-4s-1 K327.4C = 19.2 X 10-4s-1 (a) Determine the value, in s-1 of K250C (b) How long will it take, at 350C, for the reactant to decay to 1% of its original concentration? Express your answer ...
January 11, 2013

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