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a buffer is to be made with a ph of 850 by adding hydrobromic acid to one of the following bases which base is the best
the active ingredient in acetylsaliclic acid was isolated what does it mean is my experimental melting point range was
a 115 k resistor and a 505 mh inductor are connected in series to a 1250 hz generator with an rms voltage of 142 va
a generator connected to an rlc circuit circuit has an rms voltage of 120 v and an rms current of 34 ma if the
a particle with positive charge q 320e10-18 c moves with a velocity 4i 4j -k ms through a region where both a
a clear blue unknown solution tested neutral to indicator paper there was no reaction when this unknown was tested with
a piece of wood that floats on water has a mass of 00175kg a lead weight is tied to the wood and the apparent mass with
a clear colorless unknown solution was divided into four separate test tubes nothing was observed when koh was added to
for 1 mol of an ideal gas pext p 101 kpa pressure remains constant the temperature is changed from 100 degrees c to
a flask contains 400 ml of 05 m phosphate buffer that has a ph of 72 what volume of 05 m naoh should be added to
a 1000 kg experimental rocket sled on a level frictionless rails is loaded with 50 kg of propellant it exhausts the
7 200 moles of an ideal gas at 200 degrees c expands isothermally from an initial volume of 200 l to a final volume of
during exercise a person gives off 150 calories of heat in 22 minutes how much water would this amount of energy
it has been suggested that we should use our power plants to generate energy in the off-hours such as late at night and
if a solution of compound s mw 300 with a known of 40000 at max of 360 nm gave an absorbance of 10 in a 100-cm cell
in the experiment separation of the components of a mixture a student found that her mixture was 13 nh4cl 18 nacl and
a nuclear power plant generates 2000 mw of heat energy from nuclear reactions in the reactors core this energy is used
john dalton the father of the atomic theory of matter said that all atoms of a given chemical element are identical
a massless rope connects two blocks through a frictionless pulley with a moment of inertia i 04 kgm 2 and a radius r
a sample of magnesium with a mass of 100 g is burned in oxygen to produce an oxide with a mass of 166 g of magnesium
a hot 35-gram aluminum rivet is dunked into a tank containing 22 l of water to cool it the change in temperature of the
a laser beam is incident on the left mirror its initial direction is parallel to a line that bisects the mirrors what
a block with mass m 200 kg slides without friction on a ramp inclinced at 531 degrees above horizontal a spring with
a copper pipe with an outer radius of 0015 m runs from an outdoor wall faucet into the interior of a house the