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Equal volumes of 1 x 10-5 M solutions of Cd2+ and CO32- ions are mixed in one flask and equal volumes of 1 x 10-5 M solutions of Ag+ and CrO42- ions are mixed in a second. Which substances precipita
Two objects attract each other gravitationally with a force of 3.1×10?10N when they are 0.45m apart. One of the object has a mass of 2.0kg. Find the mass of the other object
Free radicals are important in many environmentally significant reactions. For example, photochemical smog, which forms as a result of the actions of sunlight on air pollutants, is formed in part by
An electron enters a region of space containing a uniform 0.0000227-T magnetic field. Its speed is 115 m/s, Find the radius r of the electron\'s path, and the frequency f of the motion
What is the numerical value (ignore units) of the equilibrium constant for the following reaction
use the appropriate standard reduction potentials to calculate the value of k at 25 degrees celcius for this reaction
Sirius has a luminosity of 8.4 * 10^27 Watts and a mass of 2.1 times the mass of the Sun, How much hydrogen does Sirius convert into helium each second
Calculate the molality of a hydrochloric acid solution that is 26.4% by mass and has a density of 1.19 g mL^-1
Fluorine 18, which has a half live of 110 min, is used in PET scans. If 100 mg of fluorine 18 is shipped at 8am, how many mg of the radioisotope are still active if the sample arrives at 130 pm
A gaseous mixture has a volume of 240L and a pressure of 1.35atm at 24*C. The mixture is 67% He and 33% Kr by mass. What is the mass of Kr
50.0 mL of Ba(OH)2 is titrated to the final equivalence point with 19.34 mL of 0.250 M H3PO4. What is the concentration of the original Ba(OH)2 solution
A 28.0 g object moving to the right at 18.0 cm/s overtakes and collides elastically with a 9.0 g object moving in the same direction at 15.0 cm/s. Find the velocity of each object after the collisio
Explain what is meant by the discontinuous emission spectra of atoms (seen in flame tests or gas discharge tubes) and how the Bohr (Planetary) and Schrodinger (Quantum-Mechanical) model for electron
Name two important forms of injury from electricity and how to avoid them
Describe how you will separate the following mixture of ions in solution. Include an explanation/rationale of the reagent used, etc. a. Na+ , Al3+, Ni2+, Sr2+
A solenoid 10.0 cm in diameter and 75.4 cm long is made from copper wire of diameter 0.100 cm, What power must be delivered to the solenoid if it is to produce a field of 7.60 mT at its center
When do you expect to see signal distortions in 1H-NMR spectrums? What kind of distortions can occur? How can you minimize the appearance of distortions
A horizontal wire of length 0.50 m, carrying a current of 6.7 A, is placed in a uniform external magnetic field. When the wire is horizontal, Determine the magnitude of the external magnetic field
The reaction 2NO ? N2 + O2, has a rate constant of 3.6 x 10^-2 M^-1 s^-1. When [NO]= 2.8 x 10^-3 M, what is the rate of change in M.s^-1 for N2
A ship travels 155 km from the port on a course of 35 degrees south of west to an island, then it travels 142 km east of south to a second island, Find the displacement from the starting point to th
The rate constant for the production of glucose from cellulose with a newly developed catalyst was found to vary with temperature as shown by the data in teh following table. What is the activation
A ball is placed on an edge of a cliff and it is kicked by a soccer player at 20.0 m/s at an angle of ? = 30? above the horizontal, Find the height of the cliff
A gas is initially at 1.2 atm, 15.0 L, and O°C. What is the final pressure when the same amount of gas is heated to 10°C and the volume changed to 13.0 L
The right and left end wires of two circuits are separated by a distance d = 2 mm. If L = 13 cm, V1 = 14 V, V2 = 17 V, R1 = 1 ?, what is the resistance (in ohms) of R2