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a dilute aqueous solution of h2so4 solution is to be concetrated with solution containing 90 h2so4 by mass solution b
a child pulls a 300-kg sled across level ground at constant velocity with a light rope that makes an angle 300 degrees
under constant pressure conditions a sample of hydrogen gas initially at 880 degree c and 950 l is cooled until its
using the boltzmann distribution calculate the ratio of electrons at the bottom of the conduction band to those at the
a lens for a 35mm- camera has a focal length given by 51mma what is the magnification of the image on the
1 calculate the ph of a solution that is 15 m na2hpo4aq and 44 m na3po4aq not sure how to solve it the ka1 of h3po4 is
to measure calcium in breakfast cereal 05216g of crushed cheerios were ashed dissonved in 6m hcl quantitatively
a pulsar is a collapsed rotating star that sends out a narrow beam of radiation like the light from a lighthouse with
the battery charger for an mp3 player contains a step down transformer with a turns ratio of 132 so that the voltage of
write equations to show how a buffer made up of equimolar amounts of acetic acid ch3coohm and acetate ch3coo- would
a tennis ball is shot vertically upward in an evacuated chamber with an initial speed of 200 ms at time t0how high does
how come the reaction of terminal alkynes and alkenes with kmno4 would yield a carboxylic acid and carbon dioxide why
an astronaut on the surface of the moon fires a cannon to launch an experiment package which leaves the barrel moving
a certain amount of gas at 280 degrees c and at a pressure of 900 atm is contained in a glass vessel suppose that the
a gas evolved during the fermentation of glucose wine making has a volume of160 l when measured at 220 degree c and
a rectangular loop of wire with sides 020 and 035 m lies in a plane perpendicular to a constant magnetic field the
calculate the ph during the titration of 200 ml of 025 m hbr with 025 m koh after 1990 ml of the base have been
an object placed 149 cm from a concave mirror produces a real image 123 cm from the mirror if the object is now moved
if a virtual image is formed 100 cm along the principal axis from a convex mirror of focal length -150 cm how far is
dry ice is solid carbon dioxide a 0149 g sample of dry ice is placed in an evacuated 477 l vessel at 260 degree c
a circular loop of radius 115 cm is placed in a uniform magnetic fielda if the field is directed perpendicular to the
dissolving 349 g of an impure sample of calcium carbonate in hydrochloric acid produced 635 l of carbon monoxide
a 9v battery is connected across a capacitor of 20uf through a switch which is initially open what is the amount of
the empirical formula of a compound is ch at 2000 degrees c0193 g of this compound occupies 972 ml at a pressure of 740
suppose the magnitude of the electric field in an electromagnetic wave is doubleda by what factor does the magnitude of