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Why is the first step in an electrophilic aromatic bromination reaction so much more endothermic than the first step in an electrophilic addition to an alkene?
A molecule has an excited state electronic energy level that emits radiation of 1/λ = 360 cm-1 when it falls to the ground state. The ground state is non-degenerate and the excited state is d
Sketch showing the acceleration of the canon ball over time if it was fired at 30°, 45° and 60° above the horizontal.
In a certain oil spill, hydrocarbons from the oil disappeared with a first-order rate constant of 2 ^ 10 -6 s -1. How many days did it take for the oil spill to decrease to 10% of its initial value?
52.0 mL of a 1.70 M solution is diluted to a volume of 248 mL. A 124-mL portion of that solution is diluted using 169 mL of water. What is the final concentration?
Suppose you have equal volumes of saturated solution NaNO3, Na2SO4, and PbS. which solution would dissolve the most with PbSO4?
The water level in a graduated cylinder initially at 220 rises to 279 after a piece of lead is submerged. What is the mass in grams of the lead?
A 350. mL air sample collected at 35 Celsius has a pressure of 550. torr. What pressure will the air exert if it is allowed to expand to 425 mL at 57 Celsius .
Light of wavelength 633 nm from a distant source is incident on a slit 0.750 mm wide, and the resulting diffraction pattern is observed on a screen 3.50 m away. What is the distance between the two
A solution is prepared by adding some solid BaCO3 to water and allowing the solid to come to equilibrium with the solution. What are the concentrations of Ba2+ and CO32- in the solution?
A space station, in the form of a wheel 135 m in diameter, rotates to provide an "artificial gravity" of 3.50 m/s2 for persons who walk around on the inner wall of the outer rim. Find the rate of ro
The acid-dissociation constants of phosphoric acid (H3PO4) are Ka1 = 7.5 × 10-3, Ka2 = 6.2 × 10-8, 25) and Ka3 = 4.2 × 10-13 at 25.0 °C. What is the molar concentration of pho
A 4.80 g nugget of pure gold absorbed 284 J of heat. What was the final temperature of the gold if the initial temperature was 28.0°C? The specific heat of gold is 0.129 J/(g·°C).
Calculate the longest wavelength visible to the human eye. given 164kJ/mol
After a day of testing race cars, you decide to take your own 1500 kg car onto the test track. While moving down the track at 10.0 m/s, you uniformly accelerate to 27.0 m/s in 10 s. What is the aver
Calculate the mass of copper that could be made from 4.0 g of copper oxide
The gas is then compressed by the piston so that its final volume is half the initial volume. The final pressure of the gas is 2.2 atm. What is the final temperature of the gas in degrees Celsius?
A 5.0--long ladder has mass 11.0 and is leaning against a frictionless wall, making a 66 angle with the horizontal. If the coefficient of friction between the ladder and ground is 0.42, what is the
A 5.0 ml sample of vinegar was titrated with 7.2 ml of 0.55 M NaOH. if the density of vinegar solution is 1.00g/ml, what is the mass percent of acetic acid present
Consider a graph of Ecell (vertical axis) versus Temperature, T (horizontal axis) for the cell reaction Pb (s) + Cu2+ (aq) → Pb2+ (aq) + Cu (s). a. What is the expression for the slope of the g
If the create has a mass of 100 and is 1.6 tall and 0.80 in depth and width, what is the minimum force needed to make the crate start tipping? (Assume the center of mass of the crate is at its cente
A lead ball is dropped into a lake from a diving board 5.0 {rm m} above the water. After entering the water, it sinks to the bottom with a constant velocity equal to the velocity with which it hit t
What does the volume correction constant (b) in the van der Waals equation represent? Why is b for helium small (b = 0.0238 L /?mol) compared to b for decane (C10H22, b = 0.3043).
When HBr(g) reacts with Cl2(g) to form HCl(g) and Br2(g), 40.6 kJ of energy are evolved for each mole of HBr(g) that reacts.
Why is dinitration not a significant process under the conditions used? and Why is the reaction flask shaken frequently during the addition of the bromobenzene to the acid mixture?