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The binary hydrogen compounds of the Group 4A elements and their boiling points are: CH4, -162 deg C; SiH4, -112 deg C; GeH4, -88 deg C; and SnH4, -52 deg C. Explain the increase in boiling points from CH4 to SnH4.
a sled-dog racer builds three identical igloos. one is used to store her supplies another houses her team of 12 dogs
In a protein determination, the color of dye changes to blue when it binds to protein, and the absorbance of light is measured. The data below were taken to calibrate the instrument. An unknown protein sample gave an absorbance of 0.867
Calculate the root mean square (rms) average speed of the atoms in a sample of xenon gas at 0.11 atm and -37C.
Acetylene (C2H2) can be produced from the reaction of calcium carbide (CaC2) with water. Draw the localized electron orbital model (hybridized orbital model) for the acetylide anion (C22-), showing ?, ?, and lone pair electron orbital.
Gasoline currently powers the majority of automobiles in the U.S. but electric cars have been touted as a way to reduce our dependence on gasoline as well as improve our air quality by reducing production of byproducts associated with gasoline com..
Calculate the density of a solution of benzene and toluene mixed at 1:1 weight ratio at 20 degree C and 1 atm, given that ?(benzene) = 0.8790 g/cm^3 and ?(toluene) = 0.8668 g/cm^3 at 20 degree C and 1 atm.
The vapor pressure of water at 45.0 degrees celcius is 71.93 mmHg. Calculate the vapor pressure of a solution of 1.50m K2CO3 at this temperature (assume 100% dissociation)
What is the change in internal energy (?E) when a system loses 10 kJ of energy and 5000 J of work is done on the system?
Calculate the pH of this buffer if it is .10 M HC2H3O2 and .10 M C2H3O2-. The Ka for CH3COOH is 1.8x10^-5.
Need to know the experimental procedure for determining the presence of metal in the sugarcane by using atomic absorption spectroscopy
When 1 mol of Fe2O3(s) is formed by combustion of Fe(s)with O2(g), 824 kJ of heat is liberated. By this reaction, how many mol of Fe should be consumed in order to liberate 100. kcal of heat
Explain the large disparity in the numerical results pf Part (a). Discuss the advantages and disadvantages of the three energy sources.
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