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Galileo made the first European observations of sunspots in 1610, and daily observations were begun in Zurich in 1749. At the present time we are well into the 23rd observed cycle. What is the frequ
In the determination of the quilibrium constant for the hydrolysis of 5.00mL of SbCl3, 24mL of water was addedand 0.0015 mol SbOCl precipitated.
A CD has a mass of 17 g and a radius of 6.0 cm. When inserted into a player, the CD starts from rest and accelerates to an angular velocity of 19 rad/s in 0.78 s. Assuming the CD is a uniform solid
Dichloromethane and Carbon tetrachloride... What are the partial pressures of these substances in the vapor above a mixturecontaining 1.6 mol of CH2Cl2 and 1.20 mol of CCl4 at 23.5 degrees Celsius?
The melting point of water at the pressure of interest is 0 degreescelcius and the enthalpy of fusion is 6.01 kj/mol. theboiling point is `00 degrees C and the enthalpy of vaporization is40.65 kj/mo
The rate of a particular reaction quadrupleswhen the temperature is increased from 298K to 308K Calculate the activation energy for this reaction.
Benzoic acid is a weak acid that has antimicrobial properties.Its sodium salt, sodium benzoate, is a preservative found in foods,medications, and personal hygiene products. Benzoic acid dissociates
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-5.00 × 107)t2 + (3.00 × 105)t, where v is in meters per second and t is in seconds. T
Two positive charges of 5.9 micro-Coulombs are placed on a horizontal surface with a coefficient of static friction of 0.75. If they are originally far apart and then one charge is slowly moved clos
Hematite (iron ore) weighting 70.7g was placed in a flask whos volume was 53.2ml. the flask with hematite was carefully filled with water and weighted the hematite and water weighted 109.3g. the den
Hydrogen atoms have an absorption line at 1.026X10-7m.What is the frequency of the photons absorbed, and what is theenergy diffrence, in joules, between the ground state and thisexited state of the
What is the theoretical atom economy of this reaction? Sodiumcarbonate is the desired product and water and card dioxide are theundesirable wastes.
A rod 16.0 cm long is uniformly charged and has a total charge of -21.0 µC. Determine the magnitude and direction of the electric field along the axis of the rod at a point 42.0 cm from its ce
What is the experience of a passenger aboard that space ship. Would he percieve time and his own aging, to have advanced through less than 4 hours? I assume that the time spent at near lightwpeed wo
When 3-methyl-1, 5-pentanediol is warmed with polyphosphoric acid, the major product has a molecular formula C6H12O.
A 3.20 L sample of neon at 4.57 atm is added to a 11.0 L cylinderthat contains argon. If the pressure in the cylinder is 5.13 atmafter the neon is added, what was the original pressure (in atm) of
Compare the three methods for distance. Explain in terms of length of backswing, speed at moment of release, and total distance used in applying force to ball before releasing it.
Snow is falling vertically at a constant speed of 9.0 m/s. At what angle from the vertical do the snowflakes appear to be falling as viewed by the driver of a car traveling on a straight, level road
Two very small spheres are initially neutral and separated by a distance of 0.62 m. Suppose that 9.3 x 1013 electrons are removed from one sphere and placed on the other. What is the magnitude of the
An unkiwn compound contians only carbon, hydrogen, and oxygen(CHO). Combustion of 3.50g of this compund produced 5.13g of carbon dioxide and 2.10g of water.
What must be the distance in meters between point charge q1 = 27.8 µC and point charge q2 = -68.7 µC for the electrostatic force between them to have a magnitude of 8.38 N?
You want to make an acetic acid/acetate buffer, pH 5.6, with a volume of 250 mL, and a final concentration of ([AcOH] +[AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong aci
What is the boiling point of a solution containing 16.0g ofcaffeine (C8H10N4O2)dissolved in 58.0g benzene (C6H6)? Theboiling point of pure benzene is 80.1 degrees Celsius andKbp is 25.3 oC/m.
Determine the acceleration and position of the bullet as a function of time when the bullet is in the barrel.
What are the balanced equations for the combustion of salicylicacid (C7H6O3), p-nitro benzoicacid (C7H5NO4), and phthalic acid(C8H6O4)? Also what are the ΔH's of the reactions?