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What is the pH of a solution prepared by adding 20.0mL of 0.10M acetic acid and 10.0mL of 0.10M sodium acetate? What is the pH after the addition of 1.0mL of 0.10M HCl to15mL of the solution?
The great, gray-green, greasy Zambezi River flows over Victoria Falls in south central Africa. The falls are approximately 108 m high. If the river is flowing horizontally at 3.60 m/s just before go
Boron has primarily two isotopes one withatomic mass of 11 amu and the other with an atomic mass of 10 amu.if the abundances of the boron atom with a mass of 11 amu is 18.9%and the abundance of the
A jogger runs 100 m due west, then changes direction for the second leg of the run. At the end of the run, she is 175 m away from the starting point at an angle of 15.0 degrees north of west. What w
A -3.07 μ C charge is placed at the center of a conducting spherical shell, and a total charge of +7.30 μC is placed on the shell itself. Calculate the total charge on the outer surface of the
Two carpenters are hammering at the same time, each at a different hammering frequency. The hammering frequency is the number of hammer blows per second. Every 4.6 s, both carpenters strike at the s
A projectile is launched at an angle of 32 degrees to the horizontal at a speed of 322 m/s. Assuming g = 9.81 m/s2, what is the projectiles maximum height and horizontal range? Stuck determining time
Starting with initial concentrations of 0.400 M and .600 Mconcentrations of nitrogen and hydrgon respectively, the abovereaction is allowed to come to equilibrium
A solid sphere of radius a=10cm is concentric with a spherical conducting shell of inner radius b=20cm and outer radius c=24cm. The sphere has a net uniform charge q1=+10μC; and conducting shell
A gas evolved during the fermentation of sugarwas collected. After purification its volume was found to be25.0 L at 22.5°C and 702 mmHg. How many grams of gas were collected?
A cargo barge is loaded in a saltwater harbor for a trip up a freshwater river. If the rectangular barge is 3.50 m by 24.0 m and sits 0.600 m deep in the harbor, how deep will it sit in the river?
Two compounds with partition coefficients of 15 and 18 are to beseparated on a column with Vm/Vs = 3.0 andtm=1 min. calculate the number of theoretical plates needed to produce a resolution of 1.5.
An infinitely sharp zone of solute is placed at the center of acolumn at time t = 0. After diffusion for time t1, the standard deviation of the Gaussian band is 1.0mm
How many electrons must be removed from each of two 4.3-kg copper spheres to make the electric force of repulsion between them equal in magnitude to the gravitational attraction between them?
A pendulum is made of a uniform stick of length L. It is allowed to swing in a vertical plane. Where should the pivot be placed on the stick so that the frequency of (small) oscillations is maximum?
Deuterium, 2H (2.0140 u), is sometimes used to replace the principal hydrogen isotope 1H in chemical studies.The percent natural abundance of deuterium is 0.015%.
The cubes are lined up from left to right and a force is applied to the left side of the left cube causing all three cubes to accelerate to the right at 2.0 m/s2. What is the magnitude of the force
A truck covers 40.0 m in 9.20 s while smoothly slowing down to a final velocity of 2.60 m/s. (a) Find the truck's original speed. ______ m/s
The heat capacity of lead is 0.13 J/g. degrees C. How many joules of heat would be required to raise the temperature of 15 g of lead from 22 degrees C to 37 degrees C?
The average person passes out at an acceleration of 7g (that is, seven times the gravitational acceleration on Earth). Suppose a car is designed to accelerate at this rate. How much time (in seconds
How much acetone would there be in a solution containing 1kg of water and acetone at the same concentration asshe had in her experiment?
Assume that a particular person's skin is found to have a resistance of 1 x 10^5O when dry and 1400O when wet. How much current will flow into the body on contact with a 120 V household AC outlet wi
In the reaction of ethanol with KBr in the presence of H2SO4, diethyl ether may be formed as byproduct. Describe by means of a set mechanism, the formation of this by product?
A point charge of 4 C is located at x = 2 m, y = 3 m. A second point charge of -4 C is located at x = 2 m, y = -1 m. Calculate the magnitude and direction of the force on an electron at x = -3 m, y =
Alan leaves LA at 8am to drive to SF, 400mls away. he travels at a steady 50mph. Beth leaves LA at 9am and drives a steady 60mph. who gets to SF first? how long does the first to arrive have to wait