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Radioactive element X decays to element Y with decay constant -0.3. Y decays to stable element Z with decay constant -0.2. Explain what is the system of differential equations for the amounts x(t), y(t), z(t) of the elements X, Y, Z respectively, at time t?
Mendeleev ordered the elements in his version of the periodic table on the basis of atomic masses instead of their atomic numbers. why
Determine the molecular formula of the oxide of phosphorous when it is in its gaseous state.
An unknown metal m reacts with sulfur to form a compound with te formula M2S3. If 3.12g of m reacts with 2.88g of S, what are the names of M AND M2S3
Calculate the cell potential E for a silver-silver chlroide lectrode immersed in 0.800 M KCl at 25 C.
1. Which of the following is NOT a form of potential energy. a. compression of a spring b. electrostatic force c. gravity d. a free electron moving at 1000 m/s e.
Explain why wet hair placed in curlers that is allowed to dry tends to retain the shape of the curl.
consider the dissolution of mns in water ksp 3.0 times 10-14.nbspmnss h2ol mn2aq hs-aq oh-aqhow is the solubility
The mixture is cooled to the temperature of liquid nitrogen at which ammonia freezes out and the remaining gas is removed from the vessel. Upon warming the vessel to 0.00 degrees C and 1 atm , the volume is 74.0 cm^3 .Calculate the mole fraction o..
Purification of nickel can be acheived by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an electrolytic cell.
The metal tungsten crystallizes in a body centered cubic unit cell with one atom per lattice point. When x-rays with wavelength 0.7107 A are used, the second order Bragg reflection from a set of parallel planes in a(n) tungsten crystal is observed..
calculate the total amount of heat energy that must be removed to convert 34.0g of steam to water at 25 Celsius
2 no g o2nbsp--gt 2 no2nbspga sample of air at a certain temperature is contaminated with 2.0ppm of no by volume. the
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