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a 0010 m aqueous solution of a weak acid ha has a ph of 400 what is the percent dissociation of ha in the
one-eighth of a sample of th remains undercayed after 54 days what is the half-life of this thorium
a generator driven by a diesel engine that develops 12 hp delivers 28 a at 240 v what is the efficiency of the
calculate the ph of a solution formed by mixing 500 ml of 0015 m hbr with 200 ml of 0200 m
a charge of 2 x 10-7 c is 10 cm from a charge of -6 x 10-6 c find the magnitude and direction of the force on each
a if a propanoic acidpropanoate buffer is 020m in propanoic acid and has a ph of 463 what is the molar concentration of
an x-ray photon with a wavelength of 069 nm scatters off an electron at 123 degrees what is the wavelength of the
the brakes of a car are applied to give it an acceleration of -3 ms2 the car comes to a stop in 5 s what was its speed
a 2000 ml sample of 0200 m hbr solution is titrated with 0200 m naoh solution calculate the ph of the solution after
water flows at 0990 ms from a hot water heater through a 450-kpa pressure regulator the pressure in the pipe supplying
1- a 546 g sample of a conducting material is all that is available the resistivity of the material is measured to be
calculate the ph of a buffer formed by mixing 85 ml of 013 m lactic acid hl with 95 ml of 015 m nal sodium
a wheel turns with a constant angular acceleration of 0640 rads2a how much time does it take to reach an angular
the ph of a solution oh hn3 was found to be 47 find the original concentration of the hydroazoic acid
in each part two solutions are mixed together if a reaction occurs write the balanced chemical equation and the net
a certain molecule has a dissociation energy of 469 ev what is the minimum frequency photon that can dissociate it in
a 05212 g sample of an unknown monoprotic acid was titrated with 996 x 10-2 m naoh the equivalence point of the
two identical pucks are on an air table puck a has an initial velocity of 20 ms in the x-direction puck b is at rest
after a satellite is blown apart the first part has speed v1 063c and the second one has a speed v2 091c if the mass
if 550 ml of ethanol initially at 80c is mixed with 550 ml of water density 10gml initially at 286c in an insulated
an object carries a charge of -80 microc while another carries a charge of -20 microc how many electrons must be
a 200 cm long organ pipe is filled with air and is open at one end and closed at the other the velocity of sound in air
aluminum is a very light metal with density of 27 gcm3 what is the weight in pounds of a solid sphere of aluminum of
an inexperienced catcher catches a 130 kmh fastball of mass 140 g within 1 ms whereas an experienced catcher slightly
a 58-kg astronaut is in space far from any objects that would exert a significant gravitational force on him he would