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If 50 mg of phenacetin were dissolved in 100 mL of water, how much ether would be required to extract 90% of the phenacetin in a single extraction?
(a) If the block travels a distance of 4.5m along the surface, what is the work done by the rope? (b) Find the work done by friction on the block.
A projectile is fired with a speed of |v| = 60 m/s at angle of 60 degrees. A second projectile is then fired with the same speed 0.5 s later. Determine the angle of the second projectile so that the
If neither driver brakes and the cars collide at the intersection and lock bumpers, what will the magnitude of the velocity of the cars be immediately after the collision? (wants an answer in km/h,
How could you improve the resolution (better separation) of chlorophyll a and b? Would this make the experiment take a longer or shorter amount of time?
What would you have observed if you had added a concentration solution of NaCl to the CoCl2/ Co(H2O)6 equilibrium system? Explain your answer in the terms of shifts or LeChatelier's principle.
How long does it take the flywheel to reach top angular speed of 1000 rpm?
A 1.5 kg ball and a 2.2 kg ball are connected by a 1.0 m long rigid, massless rod. The rod is rotating cw about its center of mass at 30 rpm. What torque will bring the balls to a halt in 4.4 s?
The electron in a hydrogen atom with an energy of-.544 eV is in a subshell with 18 states. a) What is the principal quantum number, n for this atom?
Calculate Delta H degree rxn for the reduction of V2O5. The table is : V2O5(s) = -1550.6 DeltaH degree kj/mol : H2(g) = 0 DeltaH degree kj/mol : V(s) = 0 DeltaH degree kj/mol: H2O(g) -241.82 DeltaH
The alpha particle will come to rest when all is initial kinetic energy has been converted to electrical potential energy. Find the distance of closest approach between the alpha particle and the go
If the frequency of light emitted by potassium is 3.95 x1014 Hz, what is the corresponding wavelength associated with this frequency in nanometers?
Give a strategy that allows you to use the preceding information to calculate work function and cutoff frequency for this surface. Carry out your strategy and determine the work function and cutoff
How would you detect the presence of mercury in a sample potentially containing other group 1 cations? Detail the procedure and what the conformation presence test would be.
This coil is placed inside a solenoid, with coil and solenoid axes aligned. The solenoid has 3200 turns and is 23 cm long. At what rate must the current in the solenoid be increased to induce a 1.1 mA
To see why, consider a 9 V battery supplying 3.0 A to an electromagnet with inductance 2.6 H. A switch in this circuit opens and the current drops to zero in a mere 6.7 ms. What's the emf induced in
A tablet of vitamin C was analyzed to determine whether it did in fact contain, as the manufacturer claimed, 1 g of the vita-min. One tablet was dissolved in water toform 100 mL of solution, and 10
If an alternator coil is 17 cm in diameter and is spinning at 1150 revolutions per minute in a 0.11 T magnetic field, how many turns must it have to produce a 14 V peak output?
The pain reliever phenacetin is soluble in cold water to the extent of 1.0 g/ 1310 mL and soluble in diethyl ether to the extent of 1.0 g/90 mL.
Two 57.5 kW radio stations broadcast at different frequencies. Station A broadcasts at a frequency of 892 kHz and station B broadcasts at a frequency of 1410 kHz. Which stations emits more photons p
Because anhydrous sodium sulfate is a relatively inefficient drying agent, a student uses twice as much of this salt as recommended. What are the advantages and disadvantages of adding extra drying
Light of frequency 9.95 x 10^ 14 hz ejects electrons from the surface of silver. IF the maximum kinetic energy of the ejected electrons is .18 x 10^ -19 J what is the work function of silver?
A mixture of immiscible liquids (both water-insoluble) is subjected to steam distillation. At 90 degrees C, the vapor pressure of pure water is 526 mm Hg.
When a person visits the local tanning salon, they absorb photons of ultraviolet light (UV) to get the desired tan. What are the frequency and wavelength of a UV photon whose energy is 6.5 x 10^-19
The same calorimeter was used for the dissolution of 8.86 g sample of lithium chloride in 100.0 mL of water at 22.2 °C. When the salt was dissolved, the temperature of the solution was 39.5°