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Density is an easy way to distinguish between gold (density: approx. 19 g/cm3), fool's gold (density: approx. 4.5 g/cm3), and sand (density: approx. 2.5 g/cm3). If a large golden rock has a mass of 252 g and a volume of 56 cm3, which type of mineral is it?
The lethal inhalation dose of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation dose.
Which of the following is true of the individual resonance structures which contribute to a resonance hybrid. a) each resonance structure actually exists
how many grams of methanol (CH3OH) is required to prepare a 0.112 m solution in 440 g of water? answer in units of g.
A reaction has a standard free-energy change of -14.40 kJ mol-1 (-3.442 kcal mol-1). Calculate the equilibrium constant for the reaction at 25 °C.
An unknown organic compound is mixed with 0.5190 g of naphthalene crystals to give a mixture having a total mass of 0.5959 g. The mixture is heated until the naphthalene melts and the unknown substance dissolves.
The pressure of 3.0 L of an ideal gas in a flexible container is decreased to one-sixth of its original pressure, and its absolute temperature is decreased to one-ninth of the original. What is the final volume of the gas?
Draw the Lewis structure for each of the following molecules or ions, and predict their electron-domain and molecular geometries.
cloudiness in ice cubes is caused by dissolved air in the water asit freezes. to make ice sculptures that are
If a 0.135 g sample of NaCl were placed on an ion exchange column in the H+ form and the eluate titrated with 0.1231 M NaOH, what volume of the NaOH solution would be required to reach a phenolphthalein end point
Explain what is the mechanism of the bromination of cis stilbene, by means of each reagent, pyridium tribromide as well as then glacial acetic acid. Step by step, written out mechanism, please.
why nitromethane ch3no2 have one double bond on oxgen... why not both oxygen have a double bond when writing the
For a particular redox reaction MnO2 is oxidized to MnO4- and Cu2 is reduced to Cu . Complete and balance the equation for this reaction in basic solution. Phases are optional.
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