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you are given a sample of metal and asked to determine its specific heat you weigh the sample and find that its weight
how much acid of 05n concentration would be required to fully neutralize an 86g sample of sodium
how many moles of a reducing agent are used in a reaction containing 15l of this material which possesses a density of
a steel tank is completely filled with 300 m3 of ethanol when both the tank and the ethanol are at a temperature of
a us penny has a diameter of 19000cm at 200 c the coin is made of a metal alloy mostly zinc for which the coefficient
an unknown monoprotic weak acid ha has a molar mass of 550 a solution contains 250 g of ha dissolved 800 ml of solution
in a large centrifuge used for training pilots and astronauts a small chamber is fixed at the end of a rigid arm that
what ratio ch3nh3ch3nh2 is needed to prepare a buffer solution with a ph of 860 from methylamine ch3nh2 and
find the de broglie wavelength of an oxygen molecule of average kinetic energy in air at a temperature of 1940 k the
an ancient bone contains 555 as much carbon 14 as a piece of living matter with an equal carbon content how old is the
a geiger counter reading of a radioactive sample is initially 7120 counts per minute the same sample gives a reading of
the equilibrium constant for the reaction n2g 3h2g 2nh3g is kp434x10-3 at 300c pure nh3 is placed in a 100 l flask
a 10cm long animal tendon was found to stretch38mm by a force of130n the tendon was approximately round with an average
calculate the ph of a solution formed by mixing 1720 ml of 0100 m naf and 2010 ml of 0025 m
if 490cm of copper wire diameter 100 mm is formed into a circular loop and placed perpendicular to a uniform magnetic
even if two spots have the same rf value we cannot be certain that the two samples are identical compounds suggest a
how many grams of kcooh are needed to prepare 150 ml a buffered solution of ph 385 if the acid concentration hcooh is
if you have 50 ml of a buffered solution of 015m hno2 and 005m nano2 how many ml of 02m hcl can you add before the ph
you want to prepare 250 ml of buffered solution composed of nh3 and nh4cl with a ph of 101 if you start with 250 ml of
a uniform diving board of length 521 m and mass 504 kg is supported at two points one support is located l1 332 m from
a man is doing push-ups as shown in the figure below he has a mass of 740 kg and his center of gravity is located at a
you have 200ml of a solution which is 02m nh3 and contains 023grams of nh4cl a what type solution is it b what is the
if the rms value of the electric field in an electromagnetic wave is doubled by what factor does the rms value of the
for a 025m solution of hf a write the ionization equation b what will be the concentration of all species present