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A certain species of ionized atoms produces an emission line spectrum according to the Bohr model, Find the next-to-the-longest wavelength in the series of lines
What would happen to the A450 value for a smaple which include : 1mL of 0.0025M Fe(NO3)3 + 1mL of 0.0025M KSCN + 5.0mL of 0.1M HNO3 , if you accidentally added 5 drops of disodium hydrogen phosphate
An ambulance siren is the source of sound emitted with a frequency of 1600 Hz. What is the frequency of the reflected sound wave heard at the ambulance
A 5 mC charge is located 1.8 m away from another charge. If the force between the charges is 5.0 N, what is the magnitude of the other charge
A mass vibrates at the end of a spring with simple harmonic motion. The spring constant is 30 N/m. What is the kinetic energy of the mass when it is at half its amplitude
The rear window of a car consists of thirteen thin wires (resistivity = 88.0 * 10^-8 ohms) embedded in the glass. Find the cross-sectional area of each wire
The minimum energy needed to eject an electron from a sodium atom is 4.41 * 10^-19 J What is the maximum wavelength of light, in nanometers, that will show a photoelectric effect with sodium
To save on heating cost, the owner of a greenhouse keeps 660kg of water around in barrels. find the minimum ampere rating of an electric heating system
A 20.0 kg wood ball hangs from a 1.70 m-long wire. The maximum tension the wire can withstand without breaking is 500 N. What is the largest speed this projectile can have without causing the cable to
With the cobalt ion equilibrium- CoCl4^2- +6 H2O -> CO(H2O)6^2+ +4Cl-, what is the effect on the [CO(H2O)6^]2+ molarity when chloride is added. which species is of the cobalt complex will increas
Two identical small insulating balls are suspended by separate0.25m threads that are attached to a common point on the ceiling. determine the charge on each ball
(a) 0.519 M acetic acid (weak acid with Ka = 1.8e-05). (b) 0.802 M hydrocyanic acid (HCN) (weak acid with Ka = 4.9e-10). (c) 0.693 M pyridine (weak base with Kb = 1.7e-09).
I have a rectangular slab of aluminum that is in contact with a rectangular slab of copper and both slabs are 5.00 cm x 15.0 cm in area. how much energy would flow from one face to the other
If i have a hollow copper sphere that has an outer diameter of 20.00 cm that is floating so that everything is just submerged in a bucket of water
(a) What is the pH of this buffer (b) What is the pH of the buffer after the addition of 0.48 mol of NaOH. (assume no volume change) (c) What is the pH of the original buffer after the addition of 0
A member of an aircraft maintence crew wears protective earplugs that reduce the sound intensity by a factor of 350. What sound intensity level would the crew member experience
what volume of carbone dioxide ,measured at STP,would result from the reaction of 9.786 kg of oxygen with excess pentane
A spider hangs from a strand of silk whose radius is 4.0*10^-6m. Thedensity of the silk is 1300kg/m^3. determined the mass of the spider
What temperature would be observed during the entire distillation. B) If a thermometer were immersed below the surface of the liquid of the boiling flask, what temperature would be observed. C) What
A volumetric flask made of Pyrex is calibrated at 20.0 °C. It is filled to the 175-mL mark with 36.5 °C Mercury. After the flask is filled, What is the volume of the acetone when it cools to
A conducting spherical shell of radius Ri has a net charge Q on it. Using Gauss's law, find the electric field between the two shells
Using the alpha diagram for carbonate in a closed system, at what pH would the molar CO2 concentration be approximately equal to the molar bicarbonate concentration
A nuclear-fueled electric power plant utilizes a so-called "boilingwater reactor". In this type of reactor, nuclear energy causes water under pressure to boil at 285 °C, by which the temperature
A 52-kg mountain climber, starting from rest climbs a vertical distance of 730m. At the top, she is again at rest. Find her efficiency as a heat engine
Given: NaOh 0.108 M HCl 7.80 mL calculate the molar amount of NaOH used in titration HCl