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a railroad whistle is sounded an echo is heard 50 seconds later if the speed of sound is 343ms how far away is the
two canoes are 10 m apart on a lake each bobs up and down with a period of 40 seconds when one canoe is at its highest
the block in the figure has a mass of 15kg the top angle the incline is 37 degrees and there is no friction on the
carotenoids present in all organisms capable of photosynthesis extend the range of light absorbed by the organism they
a buffer is made from benzoic acid and sodium benzoate how many grams of the acid would you have to mix with 144 g of
the salts of calcium sulfate magnesium carbonate lead ii bromide calcium chloride and silver nitrate are all added to a
a 01329 g sample of solid magnesiumis burned in a constant-volume bomb calorimeter that has a heat capacity of 1769
a solution is made by diluting 050 mol naclo to a volume of 30 l with water explain what is the ph of the solution kbof
state a net ionic equation for the neutralization reaction of ammonium chloride as well as sodium hydroxide identify
if oxygen gas were collected over water at 20 degrees c as well as the total pressure of the wet gas were 670 mm hg
the vapor-pressure lowering upon forming solution can be utilized for determining molecular weight of nonvolatile
a 04357 gram sample of impure barium chloride dehydrate weighed 03587 grams after it was dried at 200 degc for two
a 01964 g sample of quinone c6h4o2 is burned in a bomb calorimeter that has a heat capacity of 156 kj celsius the
one mole of h20g at 100 atm and 100celcius occupies a volume of 306 l explain when one mole of h20g is condensed to one
if an aqueous solution of certain organic compound has a density of 1063gml an osmotic pressure of 1216atm at 25o c and
the density of an unknown element in the gaseous state is 160 gl at300 k and 1 atm which of the following could be the
equimolaramounts of helium and neon are placed in separate flasks of equal volume and maintained at the same
explain a mixture of hydrogen gas and water vapor has a total pressure of 738 mm hg if the partial pressure of water
explain a 30-lsample of helium was placed in a container fitted with a porous membrane half of the helium effused
chemist found the density of freon-11 cfcl3 to be 558 gl under her experimental conditions her measurements showed that
explain how much energy is contained in 1 mol of the following lambda- ray photons with a wavelength of 260 10-5 nm
explain what is the condensed electron configuration of pb2 take out of the configuration is it xe 4f14 5d10 or do
list all the possible electron addresses for the electrons in a shell n5 sub shell presume you have enough electrons to
a sample of 275 moles of carbon dioxide gas at 125degc and 248 torr occupies a volume of 275 l explain what will the
the pressure in an oxygen tank stored at 0degc is 100 atm what pressure will develop in the tank if it is heated in a