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give a nanoscale interpretation of the fact that at the melting point the density of solid mercury is greater than the
1 quantum dots also known as nanocrystals are a special class of materials known as semiconductors which are crystals
assuming that a neutron star has the same density as a neutron calculate the mass in kg of a small piece of a neutron
a pure titanium cube has an edge length of 265 how many titanium atoms does it contain titanium has a density of
potassium atomic mass 3019 amu has three isotopes with masses 389367 amu 399640 amu and 409618 amu the abundance of
consider the reaction when aqueous solutions of ammonium sulfide and potassium nitrate are combined the net ionic
a steel rigid tank contains 6kg of water liquid-vapor at 60 degrees celcius with a volume of 05 m3 state 1 the tank is
perform each of the following conversionsbeing sure to set up clearly the appropriate conversion factor in each casei
silicon is widely used in the semi-conductor industry its isotopes and their anatomic masses aresi-28 279769amu si-29
calculate the molar concentration of oh - ions in an 118 m solution of a weak base hydrazine n2h4 kb 40 10-6what is
for each of the following salt solutions indicate whether the solution will be acidic basic or neutralthen using data
a long glass tube sealed at one end has an inner diameter of 100 mm the tube is filled with water and inverted into a
consider the titration of 300 ml of 0030 m nh3 with 0025 m hcl the equivalence point is reached when 36 ml of hcl
an unknown compound contains only carbon hydrogen and oxygen combustion of 400 of this compound produced 587 of carbon
given the following four substances bromine water carbon and air indicate whihc is expected to 1 be a homogeneous
what volume of a 150 by mass naoh solution which has a density of 1116 gml should be used to make 540 l of an naoh
a vessel of volume 224 dm3 contains 20 mol h2 and 10 mol n2 at 27315k initially all the h2 reacted with sufficient n2
110-phenanthroline forms a bright red complex with ironiii the complex has an analytical wavelength of 510 nm and has a
if 63 g barium chloride is reacted with excess sodium sulfate how many grams of barium sulfate are
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how many grams of aluminum oxide are produced by the complete reaction of 224 g aluminum with excess