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a sample of uranium is enriched to 32 atom-percent in u-235 with the remainder being u-238 what is enrichment of u-235
a street merchant is trying to sell you a 14 karat gold bracelet for 450 100 pure gold is 24 karats the gold is
a solid aluminum sphere has a mass of 87g how do you use the density of aluminum to find the radius of the sphere in
a box contains a mixture of small copper spheres and small lead spheres the total volume of both metals is measured by
why does the temperature 25 degrees celsius have three significant figures and the temperature of -196 degrees celsius
if 10ml of 10-on naoh is added to 1l of the buffer prepared in a how much would the ph
648g of nah2po4 and 2196 g of k2hpo4 are dissolved in sufficent water to make a liter of solution caluclate the ph of
to obtain the same antifreeze protection requires 76 of propylene glycol to replace each 62 of ethylene glycol
use the vsepr model to predict the effective electron pair electron cloud geometry and the molecular structure for the
zircon is a mineral with the empirical formula zrsio4 if all the zirconium is 90zr all the silicon is 28si and all the
a piece of metal foil is 1318 ft long and 512 inches wide the density of the metal is 8722 gcm3 and the specific heat
air containing 1 mass water is humidified by adding water if air dry basis flows into the humidification process at
an interference filter is to be constructed for isolation of nitrobenzene absorption band at 1537 cm-1 if it is to be
1500 ml of radiator liquid from a car has a mass of 1569 g calculate the density of the radiator liquid based on the
a temperature measurement of has three significant figures while a temperature measurement of has only two significant
how is chemistry related to cellphones more likely to work in hurricanes than
what is kd of a substance x if 25 ml of a 0015 m aqueous solution of x is extracted with 100 ml of ether the entire 25
why is it quantitatively not acceptable to titrate each vinegar samples with naoh titrant to the same dark pink
make the 3 polynomial functions a0 a1b1x a2b2xc2x2 orthonormal in the interval -1ltxlt1 by determining appropriate
when the d line of sodium light impinges an air-diamond interface at an angle of incidence of 30 degrees the angle of
what mass of sodium benzoate should add to 150ml of 15 m benzoic acid solution to obtain a buffer with a ph of
list 4 isotopes with their approximate atomic weight and approximate percentages commonly found in organic molecules
the air tanks used by a certain fire department each contain 250 l of air at a pressure of 2000atm and a temperature of
aluminum reacts with oxygen to yield aluminum oxide if 50 g of al reacts with 445 g of o2 what is the empirical formula
the reaction m2o3s cs ms co2g is spontaneous at low temperatures but non-spontaneous at high temperatures if we