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what is the main difference between, 2s or 3s or 4s orbitals, or 2p, 3p or 4p. is it just that they are bigger?
A rectangular loop consists of N = 100 closely wrapped turns and dimensions a = 0.4m and b= 0.3m. What is the expected direction of rotation of the loop
If you wanted to make a 3 liter solution of 500 mM formic acid buffer at pH 3.9 how many grams each of sodium formate (MW=68g/mol) and formic acid (MW=46g/mol) would you add
Cyclotrons are sometimes used for carbon-dating by accelerating singly ionized C14 and C12 ions from a sample of material. find the difference in cyclotron frequencies for the two ions
The nitrate ion reaction is positive. In this case, is it accurate to state that nitrate ion was present in the original solution? Brie?y explain, referencing specific chemical reactions to support
An astronomical telescope uses an eyepiece of power +80.000 D. what is the magnification of the telescope
Calculate the cell potential for the following reaction as written at 61 °C, given that [Cr2 ] = 0.826 M and [Ni2 ] = 0.0200 M. Cr(s) + Ni ^2+ (aq) --> Cr^2+ (aq) + Ni(s)
A sinusoidal ac voltage source in a circuit produces a maximum voltage of 12.6V and an rms current of 7.50mA. Find the voltage amplitude
A 3700 ? (ohm) resistor and a 1.2-µF capacitor are connected in series across a generator, Determine the average power delivered to the circuit
Calculate the standard potential for this cell at 25 °C. Standard reduction potentials can be found here.
A charge of -3.00 nC is placed at the origin of an x-y coordinate system, and a charge of 2.00 nC is placed on the y-axis at y=4.00cm. What are the magnitude and direction of the total force
Which of the following combinations would be the best to buffer an aqueous solution at a pH of 5.0? H3PO4 and H2PO4- (Ka=7.5e-3) HNO2 and NO2 (Ka=(4.5e-4) CH3CO2H and CH3COO (Ka= 1.8e-5) H2PO4 and H
for a helium aton in a one-dimensional box calculate the value of the quantum number of energy level for which the energy is equal to 3/2kt at 25 degrees c for a 1nm long box
A stream of air (21% O2 m, the rest N2) flowing at a rate of 10.0 kg/h is to be mixed with a stream of CO2 inside a mixer. The CO2 enters the mixer at a rate of 20.0 m/h at 150 ?C and 1.5 bar. What
An apple is placed 13.6 cm in front of a diverging lens with a focal length of magnitude 22.4 cm. What is the magnification of the image of the apple
The positions of three particles, written as (x, y coordinates, are: particle 1 (mass 3.7 kg) at (4 m, 0 m); What is the location of the center of mass
An ideal gas mixture contains 35% helium, 20% methane, and 45% nitrogen (by volume) at 2.00 atm absolute and 90 C. Calculate: (a) The partial pressure of each component
Two ice skaters, with masses of 30.0kg and 75.0kg , are at the center of a 30.0m -diameter circular rink. how long does the lighter skater take to reach the edge
The pressure gauge on a 20.0 m3 tank of nitrogen at 25 C reads 10 bar. Estimate the mass of nitrogen in the tank by : (a) Direct solution of the ideal gas equation of state. (b) Conversion from stan
A tennis player swings her 1000 g racket with a speed of 15.0m/s . She hits a 60 g tennis ball that was approaching her at a speed of 15.0m/s. compute the average force that the racket exerts on the
Sodium phosphate is added to a solution that contains 0.0014 M aluminum nitrate and 0.078 M calcium chloride. The concentration of the first ion to precipitate (either Al3+ or Ca2+) decreases as its
A 40.0g ball of clay traveling east at 3.00m/s collides, What is the speed of the resulting ball of clay
Calculate the solubility of copper (II) iodate in 0.56 M copper (II) nitrate. Ksp* is 7.4x10-8 M3.
A parallel-plate capacitor having square plates 4.50cm on each side and 8.00mm apart is placed in series with an ac source of angular frequency 620rad/s, What is the resonance angular frequency of t