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Questions (16)
Tantalum metal is produced by reaction of potassium heptafluorotantalate (K2TaF7) with elemental sodium (Na) in a reactor heated
3 answers
794 views
Consider an electron in the ground state of hydrogen.
(a)What is the least amount of energy needed to excite the ground state
2 answers
525 views
Tantalum metal is produced by reaction of potassium heptafluorotantalate (K2TaF7) with elemental sodium (Na) in a reactor heated
5 answers
528 views
Atoms of ionized lithium gas (Li2+) are struck by neutrons moving at a velocity of 1.46e5 m/s. Calculate the shortest wavelength
1 answer
451 views
A particle wavelength (λp) of a proton is 10-12m.
What is the velocity of this proton [m/s]? To achieved the velocity that you
6 answers
610 views
Calculate the enthalpy of atomization per unit volume for Rb. Express your answer in kJ/m3.
Determine the volume (in mL) occupied
5 answers
524 views
Calculate the atomic weight of an element (X) given the following information:
26X: 26.000 amu at 0.1102 fractional abundance
3 answers
575 views
(a) Consider the gaseous molecule BN-. At home, construct the molecular orbital diagram that is consistent with the known order
6 answers
672 views
Magnesium can be produced by reaction of magnesium oxide (MgO) with silicon (Si). The by-product of the reaction is magnesium
1 answer
595 views
A gas in a discharge tube consists entirely of ions of the same element, of the same charge. Each ion has only one remaining
3 answers
691 views
Calculate the wavelength of a proton with energy 2.45eV.
in meter plz
3 answers
471 views
(b) Calculate the absorption edge of this material. Express your answer as a wavenumber in units of inverse meters.
5 answers
525 views
(f) How much oil will dissolve in the surfactant-water solution if the concentration of surfactant falls in region A?
3 answers
458 views
A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and
5 answers
468 views
The silicon wafer is coated with a layer of metallic aluminum which acts as an electrical contact. The x-ray diffraction pattern
4 answers
411 views
(a) A pressure vessel contains a large volume of CO2 gas at 10 atm pressure. A membrane composed of a poly(ether ketone) polymer
3 answers
456 views
Answers (32)
5520
same here... Strange...
A) glass B B) glass A
I think all of the except E are correct. Any idea?
Sorry I meant the last one
it's number 5
It's E
2 and 3
1201
Please stop spamming.
Please don't spam.
Please stop spamming or I have to report you. What's more what I do is none of your concern. Thank you.
Muchas gracias mi amigo ;)
Sorry but I couldent make it :(
Thank you for the help.
Thank you very much.
Many thanks.
Please don't spam.
Thanks dear but actually I got the two first ones last night and stuck with part c. :(
Many thanks.
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If you don't know the answer please don't spam.
Please don't spam.
Please don't spam.
Formula please...
Here is the full question: (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. Answer for a=6.22*10^18 (b) Calculate the absorption edge of
b please...
I'll be appreciate if you tell me about b
Many thanks. I see now :)
Thanks yoshii but what about a)?
Would you please give the formula?
July 29,2011 i just took thw test and aced it these answers are 100% right thanx for the help. 1.D 2.B 3.B 4.D 5.B 6.B 7.A 8.A 9.A 10.D
