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The intensity of electromagnetic radiation from the sun reaching the earth's upper atmosphere is 1.37 kW/m^2
What is the minimum amount of electrical energy required by the refrigerator to carry out this process if it operates between reservoirs at temperatures of 20.0 °C and -20.0 °C?
A solid mixture of KCl, KNO3, and Ba(NO3)2 is 20.92 mass % chlorine, and a 1.000 g sample of the mixture. What are the mass percents of KCl, KNO3, and Ba(NO3)2 in the mixture?
A man and a boy are carrying a uniform wooden beam that is 8 m long and weighs 900 N. The boy lifts at one end. At which distance from the boy does the man have to hold the beam so that he lifts twi
Calculate the molecular weight of citric acid if 25.0 mL of a 0.750M sodium hydroxide solution were required to titrate 1.20g of citric acid.
The thermal decompositon of N205(g) to form N02(g) and o2(g) is a first order reaction. The rate constant for the reaction is 5.1 x 10-^-4 s^-1 at 318K. What is the half-life of this process?
For each 100.0 grams of phosphoric produced, what volume of hydrogen flouride gas is produced? Assume atmospheric temperature and room temperature.
A speck of clay of mass m = 0.01 kg strikes and stick to a wooden block of mass M = 0.99 kg, which rests on a frictionless horizontal surface and is attached to a spring with spring constant k = 10
The classical picture of the hydrogen atom has a single electron in orbit a distance 0.0529nm from the proton. Calculate the electric potential associated with the proton's electric field at this di
How does the chromatographic seperation ability of thin layer chromatography compare to seperation (resolving) power of column chromatography?
A new material is found to be superconducting below 104 K. How much resistance will a 100 mm long sample of this material have if it is at a temperature of 93.6 K while connected to a 8.3 V AC-power s
Write and blance a reaction for Lithium. How many moles of H2 will be formed by the complete reaction of 6.23 moles of Li and excess water?
The headlights on a certain car are measured to be 1.1 m apart. The diameter of the pupil in a human eye is 2.5 mm. What is the furthest distance at which a human eye could clearly see the headlight
How much heat, in kJ, did the body have to supply to raise the temperature of the water to body temperature (37 C)?
An electron traveling at 713 m/s enters a 0.9 T magnetic field. The angle between the velocity and the field is 90o. Find the radius of the resulting circular path.
Consider the interface between atmospheric air and a body of water, both at 17 °C.
Write a balanced molecular equation for the reaction between zinc metal, NaOH, and water to produce Na2[Zn(OH)4] and hydrogen gas.
The work function of sodium is 2.23 ev. What is the longest wavelength that a photon may have , if it is to cause an electron to be ejected when the photon strikes the surface of a piece of sodium?
A 25oC capacitor is charged to a potential of 18V. (a) How much charge is stored on the capacitor? (b) The potential is then changed so that the charge becomes 5.9 x 10-4C. What is the change in pot
The plates of a spherical capacitor have radii 43.4 mm and 46.9 mm. What must be the plate area in square centimeters of a parallel-plate capacitor with the same plate separation and capacitance?
On a hot summer day, the temperature of air in Arizona reaches 113°F. What is the speed of sound in air at this temperature? (Enter your answer to four significant figures. The speed of sound at
An electron traveling at 993 m/s enters a 1.5 T magnetic field. The angle between the velocity and the field is 90o. Find the radius of the resulting circular path.
2.55g napthalene dissolved in 30g of benzene. benzene freezes at 5.5C and resulting solution freezes at 2.13C what is the freezing point depression constant of benzene.
An electron is accelerated through a potential difference of 400V. Find its wavelength and momentum.
The density of toluene (C7H8) is 0.867 g/mL, and the density of thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 23.0 g of thiophene in 250.0 mL of toluene.