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A He+ ion emitts a photon with a frequency of 2.76× 1015 Hz. If the energy of the initial state ofthe He+ ion was -3.49 × 10(-19) J,calculate the energy of the final state. Express answ
You have two flasks of equal volume. Flask A contains H2at 0°C and 1 atm pressure. Flask B contains CO2 gasat 0°C and 2 atm pressure. Compare these two gases with respectto each of the follo
Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +1.80 pC. (a) What percentage of the electrons originally in the cube was removed?
Assume that you have 1,2,5,and 10 ml pipets and a 25mlvolumetric flask. Describe in detail how you would prepare asolution with a concentration near 0.10 M from a 0.650 M stocksolution.
To solve this problem, you can consider a cubic box on the Moon 1m on each edge, and find how long it will take to fill the box.
A flask of volume 9.1 liters contains 5.0g of hydrogen, 0.55moles of oxygen, and sufficient argon so that the partial pressureof argon is 2.20 atm. The temperature is 136 c.
At what height above the surface of the earth does the weight of the object decrease to .99mg?
If the pure vapor pressures of benzene(C6H6) and toluene(C7H8) are Pben=94.6 torr andPtot= 29.1 torr, what are the mole fractions of benzeneand toluene xben and xtol in both the liquidand vapor phas
A piston with a radius of 10 cm and a mass of 50 kg presses down on water inside a cylinder. The atmospheric pressure of 100 kPa also presses down on the top piston. What is the water pressure?
For each of the anatomical levers listed, indentify the class of lever represented; identify the fulcrum, effort point, and resistance point; and name the kind of movement favored by this type of le
Calculate the volume of methane, CH4, measured at 300. Kand 1.09 atm, that can be produced through the bacterialdecomposition of 1000 g ofC6H12O6.
Calculate the density of iron Fe given that the melatllic radius isrFe= 1.24 Angstrom and that Fe displays a body centeredcubic unit cell.
When each sphere has a charge of +1.00 µC, the spacing doubles. Assuming that the spheres have a negligible diameter, determine the spring constant of the springs.
Firstly, In order to perturb the structure of protein J,you can make any substitution you wish for aa21 ( the 21st aminoacid residue from the NH2 terminal), which is Lys.
Two point charges lie along the y-axis. A charge of q1 = -8.5 μC is at y = 6.0 m, and a charge of q2 = -7.5 μC is at y = -4.0 m. Locate the point (other than infinity) at which the total elect
Calculate the # of molecules of N2, ofO2, and of Ar in 1.00 L of air at 21 ºC and 1.00atm. Calculate the mole fractions of N2,O2, and Ar in the air.
A charge of -4.00 nC and a charge of -5.35 nC are separated by a distance of 40.0 cm. Find the position at which a third charge of +7.80 nC can be placed so that the net electrostatic force on it is
To a sol containing 2.00g of CaCl2 & RbCl we add an excess of AgNO3 to form 3.45 gof AgCl(s) precipitate. What is the % of RbCl in theoriginal mixture.
An adventurous archaeologist crosses between two rock cliffs by slowly going hand-over-hand along a rope stretched between the cliffs. He stops to rest at the middle of the rope . The rope will brea
If a cube with edges of 1.000 cm weighs 25.68 g, what would themass of a cube of the same material with sides 2.57 cm in length be?
A bird migrating toward its summer nesting site travels 3200 miles in a direction 18° East of North. How much farther North is the bird at the end of this migration?
The SI unit of length is the meter, which is defined as thelength equal to 1,650,763.73 wavelengths of the light emmitted by aparticular energy transition in krypton atoms. Calculate thefrequency o
A third point charge q = +9.3 µC is fixed at the origin. The net electrostatic force exerted on the charge q by the other two charges has a magnitude of 25 N and points in the +y direction. De
A 2.10-g sample of PCl3(l) reacted with excess H2O(l) in acalorimeter. The temerature rose from 20.55oC to30.30oC. The heat capcity of the calorimeter andcontents is 427 J/oC. What is the enthalpy c
A large box containing your new computer sits on the bed of your pickup truck. You are stopped at a red light. The light turns green and you stomp on the gas and the truck accelerates. To your horro