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what happens to recrystallization if the crystals obtained by suction filtration are not washed with fresh hot solvent
Two pencils have the same average density (500 kg/m^3). The mass of the mechanical pencil is twice the mass of the conventional pencil. Which accelerates at the greater rate
The Kd of methylene chloride/ water of an organic compound is 2.50 A solution is made my dissolving 48 mg of the compound in 10 ml of H2O. How many mg of the compound will be extracted using 10 ml o
the blood plays an important role in removing heat from th ebody by bringing the heat directly to the surface where it can radiate away. nevertheless, what is the thermal conductivity of this person
A free electron and a free proton are exactly 1.2cm apart. Find the magnitude of the acceleration of the proton
The commercial synthesis of adipic acid involves the oxidation of cyclohexanol with nitric acid. List the hazards involved with this process, and briefly comment on both the environmental impact and
When two parallel slits are illuminated with monochromatic light of wavelength 632.8 nm, What is the distance between the parallel slits
An advantage of the hydroboration reaction is that the rearrangement of the carbon skeleton does not occur. This lack of migration contrasts with results obtained upon the addition of hydrogen chlor
As shown in the figure, a square has sides of d = 5.0 cm with a charge of Q = -18.0 µC at one corner (a) and with charges of q = +6.0 µC, Find the electric field at the center of the squa
Offer a reasonable explanation to account for the unequal ratio attained (2% of one isomer and 98% of the other isomer) in the reaction of BH3 (and the solvent diglyme) with 2-methyl-2-butene.
A small object is located 31.6{\rm cm} in front of a concave mirror with a radius of curvature of 39.0{\rm cm}. Where will the image be formed
Explain how an increase in the amount of dissolved CO2 in ocean water results in a decrease in the pH of ocean water.
A plastic rod is rubbed with a cloth, and in the process it acquires a charge of ?2.1×10E?8C. How much does the mass of the rod increase by
When diborane (B2H6) dissociates in either solvents, such as tetrahydrofuran (THF), a complex between borane (BH3) and the ether is formed. (a) In the Lewis sense, what is the function of BH3 as it
a 0.5 kg block of aluminum is heated to 200 degrees C. The block is then quickly placed in an air insulated tub of cold water at 0 degrees C and sealed. compute the final temperature of the water a
A 88 g cube of ice at 0°C is dropped into 1.0 kg of water that was originally at 76°C. What is the final temperature of the water after the ice has melted
What five chemical tests would be performed to determine the difference between the starting alkene and the alcohol product of a hydroboration-oxidation reaction
A 95 g ice cube at 0°C is heated until 85 g has become water at 100°C, How much energy was added to accomplish the transformation
What does the structure of isopinocampheol (the product of a hydroboration-oxidation reaction of (1R)-(+)-alpha-Pinene) indicate about the mechanism of the reaction in terms of regioselectivity and
An aluminum cup contains 225 g of water and a 40 g copper stirrer, all at 27°C. A 490 g sample of silver at an initial temperature of 90°C is placed in the water. Calculate the mass of the a
A flask contains 10.0 mL of HCl and a few drops of phenolphthalein indicator. The buret contains 50.0 mL of 0.230 M NaOH. what volume of NaOH is needed to reach the end point of the titration
The punter on a football team tries to kick a football so that it stays in the air for a long "hang time." what is the "hang time"
an 1800 kg car is moving at 14 m/s slows to 8.0 m/s in 4.4 s. Use the impulse momentum theorem to find the magnitude of the force on the car
Draw chemical structures to explain why a water molecule might be essential to producing a stable crystal of caffeine.
A 9.00-V battery delivers a current of 1.35 A to the lightbulb filament of a pocket flashlight. Calculate the power delivered by the battery