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After the reaction is complete, the excess MnO2 is collected by filtration, washed, allowed to dry, and is then weighed; 0.3521g are recovered.
A TLC plate showed two spots with Rf values of 0.25 and 0.26. The plate was removed from the developing chamber, the residual solvent was allowed to evaporate from the plate, and then the plate was
Neglecting gravity, estimate the average force of air resistance during a pitch, if the distance between the plate and the pitcher is about 15m .
At one instant of time the first particle with a charge of 4.20 uC is located at x = 0 and y = +7.40 cm, and the second particle with a charge of 2.00 uC is located at x = 0 and y = -7.40 cm.What i
In a chemcial analysis of a chromium alloy, all of the chromium is first converted to chromate ions. a 50ml sample of chromate ion solution is then reduced in a basic solution to chromium (lll) hydr
You throw a ball horizontally off of a building with a horizontal velocity of 5m/s. What is the ball's horizontal velocity 8 seconds later? How high should the building be if you want the ball to fa
As a 2.0-kg object moves from (2 i + 5 j)m to (6 i - 2 j)m, the constant resultant force acting on it is equal to (4 i - 3 j)N. If the speed of the object at the initial position is 4.0 m/s, what is
If the frequency of the siren relative to the polive car is 500 Hz, what is the frequency heard by an observer in the truck as the police car approaches the truck? (Assume the velocity of sound in a
A car approaches a stationary police car at 80mi/hr. The frequency of the siren (relative to the police car) is 500 Hz. What is the frequency (in Hz) heard by an observer in the moving car as he app
A 10.0 g piece of metal at 100 Degrees Celcius is transferred to a calorimeter containing 50.0 mL of water intially at 23.0 Degrees Celcius. Calculate the specific heat capacity of the metal if the
A steady wind of 25 knots over a very long fetch can create waves of 3-meter height, a period of approximately 10 seconds, and a speed of 16m/s. A steady wind of 40 knots can create waves of 6-meter
A gondola can carry 20 skiers, with a total mass of up to 1760kg . The gondola ascends at a constant speed from the base of a mountain, at 2450 m, to the summit at 3910 m. How much work does the mot
A student placed a mixture of BaO and CaO in a 1.46 L flask containing carbon dioxide gas at 35.0 degrees celsius and 746 mmHg. After the reactions were complete, she found that the CO2 pressure had
When cylinder-head bolts in an automobile engine are tightened, the critical quantity is the torque applied to the bolts. Why is the torque more important than the actual force applied to the wrench
In an adiabatic bomb calorimeter, oxidation of 0.4362g of naphthalene(C10H8) caused a temperature rise of 1.707 degree celsius. The final temperature was 298.15K.
How many liters of gaseous hydrogen bromide at 27 degrees Celsius and 0.965 atm will a chemist need if she wishes to prepare 3.5L of 1.2 M hydrobromic acid?
Transverse waves are traveling on a 1 meter long piano string at 500 m/s. If the points of zero vibration occur at one-half wavelength (where the string is fastened at both ends), find the frequency
If P waves are received at a seismic station 1 minute before an S wave arrives, how far to the earthquake center?
Sketch a free-body diagram, labeling the gravitational and normal forces acting on the beam and placing the woman x meters to the right of the first pivot, which is the origin. (Do this on paper. Yo
If our eyes could see a slightly wider region of the electromagnetic spectrum, we would see a fifth line in the Balmer series emission spectrum.
Water pressurized to 3 * 10^5 pa is flowing at 5 m/sec in a horizontal pipe which contracts to 1/3 its former area. What is the pressure and velocity of the water after the contraction?
If the cards are to blur together into solid blocks of color when viewed by a spectator at the other end of the stadium (140 m away), what is the maximum diameter (in mm) of the spectator's pupils?
A supertaker filled with oil has a total mass of 6 * 10^8 kg. If the dimensions of the ship are those of a rectangular box 300 meters long, 80 meters wide, and 40 meters high, determine how far the
Water flows into the center of a porous material and then flows through the other side. (The center of the material is cylindrical in nature). Assuming the output rate of flow is double the input r
The inner sphere has a net charge of Q1 = 4.70 µC, and the outer spherical shell has a net charge of Q2 = -8.30 µC. What is the surface charge density, sb, on the inner surface of the oute