Why or why isn't it possible to have pi bonds between two atoms without there being a sigma bond?
How do you work out which ionic molecules are more polarised and which are less covalent
A mixture of helium and neon gases is collected over water at 28.0 C and 745 mmHg. if the partial pressure of helium is 368 mmHg, what is the partial pressure of neon?
A certain strain of tobacco mosaic virus has Mm = 4 *10^7 kg/k mol. How many molecules of the virus are present in 1 cm^3 of a solution that contain0.1mg of virus per cm^3
What volume, in milliliters, of a 2.00 M aqueous KOH solution would be needed to neutralize a) 110.0 mL of 0.0550 M aqueous H2SO4? b) 45.00 mL of 2.50 M aqueous HCl?
A closed vessel contains moist air at 20 degree celcius, the relative humidity being 30 %. What would be the relative humidity become if the vessel were cooled to 10 degree celcius ? SVP of watyer at 20 deg celcius = 17.5 mm SVP of water at 10 deg celcius = 9.2 mm
A Hydrogen atom, treated as a point mass, is confined to an infinite one-dimensional square well of width 1.0nm. How much energy does it have to give up to fall from the level with 5 to the lowest energy level? The answer needs to be in Joules. This problem deals with quantum part of Physical chemistry.
If you start with 64 g of a material with a half-life of 10 years, how much will be left at the end of 40 years?
Which element(s) has an outermost electron that could be described by the following quantum numbers: (3,1,-1,+1/2) ?
Calculate the amount of energy associated with a photon of light with a frequency of 6.23 x 10E14 /s.
Calculate the frequency, in units of "per second", of light with a wavelength of (a) 540 nm, and (b) 650 nm.
A certain colour of light has a wavelength of 550 nm. What is the energy possessed by a photon of such light? (a) 2.42 x 10E-19 (b) 5.45 x 10E14 J (c) 3.61 x 10E-14 J (d) 3.61 x 10E-19 J (e) 5.37 x 10E-19 J
How would you describe how to separate a mixture of oil, sand, and saltwater?
Whiskey can have an alcohol content in the 50 to 60% range whereas the upper limit for alcohol content in beers and wines is only about 10%. Why is this?
What precipitate forms when solutions of the following are mixed: K+, Ca2+, NH4 1+, and Cl-, NO3 1-, CO3 2-?
Explain what is meant by a Scientific Method.
A shipment of iron-fortified powdered baby formula has been rejected by the buyers in China because the power is off-color. The color of the powder should be cream-colored, but this shipment is reddish-brown to gray. Investigation by the manufacturer shows that the manufacturing process is simply "bucket chemistry". This mean
Find the following: <r> for the 2p0 <r2> for the 2p1
Explain why each of the following integrals must be 0 when the functions are hydrogen-like wavefunctions: <2p1|Lz|3p-1> and <2p0|Lz|2p0> Show that taking the lithium spin orbitals in a Slater determinant as 1sa, 1sb, and 1s(c1a+c2b) where c1 and c2 are constants gives a wavefunction that equals zero. Tthe a and b are alp
Isotopes & Radioactive Decay. Includes using relationships between half-life (t1/2), decay constant, understanding decay.
The isotope C14 has a half-life of 5700 years. What fraction of the C14 atoms will decay (a) each year, and (b) each minute?
If the volume fraction of ozone in the air of a city is 5x10-7, what is the ppm of ozone in the air?
If a gas occupies 625 mL at 0 Celsius and 760 torr pressure, what will its volume be at 373 degree C and 1520 torr pressure?
What is the atmospheric pressure if the partial pressures of nitrogen, oxygen, and argon are 77.75 kPa, 19.94 kPa, and 1.99 kPa, respectively?
Convert 37 Celsius in to Fahrenheit
An angstrom is a non SI unit of measurement equal to 10^-10m. How many angstroms are equivalent to 259 picometers?
What is the coefficient for water (H2O) when the following equation is balanced using the lowest whole numbered coefficients? Al(s)+ ____H20(l) --> Al(OH)3(s) + H2(g)
1) How many significant figures are there in the answer to the following problem? (8.881*.02100) + .590? 2) A parsec is 206,265 times the distance from earth to the sun. If the distance is 8.000 million miles, express the distance of a parsec in miles in scientific notation.