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Analysis of an unknown substance showed that it has high boiling point and is brittle. It is an insulator as a solid but conducts electricity when melted, which of the following substances would hav
The accuracy of this experiment depends on good technique. Would the following techinque errors result in an erroneously high or an erroneously low calculated molarity of an NaOH solution
A point charge q is situated between two infinate grounded parallel plates, at a distance x from one and a-x from the other. calculate the force on a charge q in the form of an infinite series
you are making a buffer. you add 57.89g of sodium methanoate to 500.0 ml of water. The molecular mass of sodium methanoate is 68.01 g/mol. The Ka of methanoic acid is 1.8*10^-4. find the pH of the b
An artificial satellite circling the Earth completes each orbit in 133 minutes. Find the altitude of the satellite
Iodine-123 is used to establish thyroid gland function. If after 79.8 hours, 1.56% of the original dose remains in the patitent, what is the half-life
Consider a flat disc of radius R and surface charge density (sigma) = a s^n, Find the potential at the center of the disc
A ball is shot from level ground into the air. At a height of 9.1 m, its velocity is given by v=(7.6m/s) + (6.1m/s), What total horizontal distance can this ball travel
You are titrating 50.00 ml of unknown concentration of HNO3 with 0.487 M lithium hydroxide. You add 25.34 ml of lithium hydroxide to reach the neutralization point. Write the neutralization reaction
A hypothetical 40cm long arm is assumed to be weightless. What is the maximum weight that can be held in the hand if the muscle is attached 1 cm from the below
The OH- concentration in an equilibrium 0.101 M NH3 solution is 1.30*10^-3 M. Calculate Kb of NH3.
The temperature of 15 kg of water increases at 0.003 degrees Celsius per second. At what rate is the internal energy of the water increasing
A hydrogen atom is moving at a speed of 125.0 m/s. It absorbs a photon of wavelength 97 nm that is moving in the opposite direction. By how much does the speed of the atom change
Given Keq=kr/kf= 0.5 suppose the addition of an enzyme increases kf by a factor of 10^9, (a) calculate Keq for this reaction (b) suppose you add an enzyme that increases Kf by a factor of 10^9, what
Show all the steps for determining the overall net ionic equation by the method of half reactions for the redox reaction of permanganate with oxalic acid. the two unbalanced half reactions are MnO4
You want to use a lens with a focal length of 37.0cm to produce a real image of an object, with the image twice as long as the object itself. Where should the object be placed
The dipole moment of hydrogen chloride is 1.08D while that of hydrogen bromide is 0.82D. On the basis of dipole-dipole interactions, hydrogen chloride should have a higher boiling point than hydroge
a man has to install an instrument on top of the mast of his sailboat. He uses a boson's chair to hoist himself up. With what acceleration does the man move up
Helium has a lower boiling point than nitrogen. What do you conclude about the polarizability of helium in comparison to that of nitrogen
A particle starts from the origin with velocity 5 m/s at t = 0 and moves in the xy plane with a varying acceleration given by = (8t), Determine the velocity of the particle as a function of time
You are the design engineer in charge of the crashworthiness of new automobile models. What is the average force acting on the car by the inner barrier
If a non-cyclic alkane shows a molecular ion peak at m/z 464, what is the chemical formula
A 11kg hammer strikes a nail at a velocity of 8.7m/s and comes to rest in a time interval of 7.4ms, What is the impulse of the given nail
A 23-g bullet traveling 270m/s penetrates a 2.2kgblock of wood and emerges cleanly at 215m/s. how fast does it move after the bullet emerges
What is the half-reaction of P(s) going to the most common ion for O? Hint: P is under N in the periodic table so, their most common charge should be the same.