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CaCl2 is used to lower the freezing point of water on streets and sidewalks. Assuming it forms an ideal ionic solution, how many grams of CaCl2 must be added to 1.50 kg of water to lower the freezing point of the mixture to -2.00* C? Kf for water = 1.86*/molal
If you had a mixture of benzoic acid (C6H5CO2H) and biphenyl (C6H5C6H5), how would you purify them based on solubility/recrystallization
pure nitrogen can be prepared when an aqueous solution of ammonium nitrite decomposes to form water vapor and nitrogen
Also, give an estimate the pl of this tetrapeptide (you may assume the pKa of any acidic R group is 4, the pKa of any basic R group is 11.5, and the pKa of the alpha-COOH is 2, and the alpha-NH3 is 9.5).
When 3 methyl 1 butane reacts with Hbr, two alkyl halides are formed: 2 bromo 3 methylbutane and 2 bromo 2 methyl butane. Propose a mechanism that explains the formation of these products.
Balance each of the following equations and choose the appropriate expression for its equilibrium constant. a. NO(g)--> N2O(g)+NO2(g)
calculate the minimum volume of distilled water in liters necessary to completely dissolve a 7.5 g sample of agbr s at
A student is given an antacid tablet that weighed 5.6832g. The tablet was crushed and 4.3628 g of the antacid was added to 200mL of simulated "stomach acid". This was allowed to react and then filtered.
Explain why most multicellular organisms use an iron-containing protein for oxygen binding rather than free iron. Your answer should include an explanation of (a) the role of heme and (b) the role of the protein itself.
Balance the following reaction and predict the number of moles of SO2 required to completely react with 3.0 moles of 0.2 SO2+O2---->SO3
Determine the values for the equilibrium constants for the following reactions. (Hint: When reaction equations are added, the equilibrium expressions are multiplied.) (a) Na2O(s) + 1/2 O2(g) Na2O2(s) (b) NaO(g) + Na2O(s) Na2O2(s) + Na(l) (c) 2 NaO..
A radioactive sample contains 2.50g of an isotope with a half-life of 3.8 days. How much of the isotope in grams will remain after 14.2 days
A body consists of a right circular cone whose base is 12 in. and whose altitude is 16 in. A hole 8 in. in diameter and 4 in. deep has been drilled from the base. The axis of the hole coincides with the axis of the cone. Locate the centroid of the..
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