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Until about 1900, there was little cooperation between the federal government and state governments, a condition which was known as (?) federalism.
The concentration of Mg2+ in seawater is 0.052 M. At what pH will 99% of the Mg2+ be precipitated as the hydroxide salt? (Ksp for Mg(OH)2= 8.9 x 10 -12.)
a chemist often uses a white card with a black mark to aid in reading the meniscus of a clear liquid. How does this technique make the reading more accurate
What is the general relationship between the size of an atom and its first ionization energy? Which element in the periodic table has the largest ionization energy? Which has the smallest?
calculate the concentration of each ion present in a solution that result from mixing 50 ml of a .20 m naclo3 solution
Calculate the equilibrium constant for the photodecomposition of ascorbic acid (vitamin C) in a poorly packaged fruit, such as guava. 165g of guava contains 0.377g of ascorbic acid.
when making ice cream, the temperature of the ingredients is decreased to below the freezing point of pure water by using a surrounding water bath that contains a large amount of table salt, NaCl.
A weather balloon has a volume of 450 L when filled with helium at 45oC to a pressure 0.80 atm. What is the new volume of the balloon in an atmosphere where the pressure
Hydrazine is somewhat toxic. Use the half reactions shown below to explain why household bleach(a highly alkaline solution of sodium hypochlorite)
Mixtures of helium and oxygen can be used in scuba diving tanks to help prevent "the bends." For a particular dive, 46L He at 25°C and 1.0 atm and 12L O2 at 25°C and 1.0 atm were pumped into a tank with a volume of 5.0L.
The heat of fusion of sodium metal is 630 cal/mol. How much heat (in kilocalories) is required to melt 179 grams of sodium
Calculate the pH at the equivalence point in the titration of 54 mL of 0.10 M methylamine with a 0.20 M HCl solution. Ka = 4.4 X 10^-4
Sulfur is one of the world's most important raw materials. Fires involving sulfur pose some unique hazards. Why are secondary fires likely to result near burning bulk quantities of sulfur. What precautions should be taken to prevent these s..
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