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the density of gold is 1931 gcm3 and the density of platinum is 2143 gcm3 if equal masses of gold and platinum are
write the reaction of the borohydride ion with water using curvy arrows to show electron movement to form one molecule
a tank having a volume of 011 m3 contains helium gas at 170 atm how many balloons can the tank completely fill if each
sodium borohydride reacts slowly with water and even more slowly with ethanol to generate h2 what observation would
in a metal each atom and its core electrons are connected by springs to each of their neighbors this would give a
consider a powder with 995 aucl3 particles and 05 agcl particles and each weighs 10 microg a if one weighed out 40 mg
sound is passing perpendicularly through an open window whose dimensions are 11 m x 075 m the sound intensity level is
a raindrop of mass 335 10 -5 kg falls vertically at constant speed under the influence of gravity and air resistance
a a party store has a tank of helium at a pressure of 68 atm in the store where the temperature is 21degc if an
the hang time of a punt is measured to be 450 s if the ball was kicked at an angle of 63 degrees above the horizontal
the total volume of water in the oceans is approximately 140 multiplied by 109 km3 the density of sea water is 1030
a flask contains 300ml of 012m phosphate buffer that has a ph of 72 what volume of 02m hcl should be added to drop the
in a nuclear power plant the fuel rods last 3 yr before they are replaced if a plant with rated thermal power 100 gw
a stone is projected at a cliff of height h with initial velocity of 42 ms directed 60 degrees above the horizon the
air bag in automobile inflate when sodium azide nan3 rapidly decomposes to its components elements 2nan3 s 2nas 3n2
a spacecraft is launched from the surface of the earth with a velocity of 0480c at an angle of 500deg above the
assuming no heat loss by the system what will be the final temperature when 30 g of water at 100oc are mixed with 78 g
a boy shoots a rock with initial velocity of 40 ms straight up from his slingshot he quickly reloads and shoots another
a typical adult ear has a surface area of 149 times 10-3 m2 the sound intensity during a normal conversation is about
write condensed structural formulas of two esters and a carboxylic acid that each have molecular formula
a series rlc circuit contains the following components r 300 102 l 350 102 mh c 500 microf and a generator with
a diverging lens with a focal length of -22 cm and a converging lens with a focal length of 19 cm have a common central
in aqueous solution amphipathic molecules form aggregates of micelles or bilayers that maximize hydrophobic interaction
a spaceship of proper length298m takes079micros to pass an earth observer determine the speed of this spaceship as
an automobile accelerates from rest at 20 ms2 for 20 s the speed is held constant for 20 s after which there is