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Both the meta- and para- forms of phenylene diamine are used in the production of Kevlar and Nomex, respectively. Why is a corresponding material with similar properties not made from ortho-phenylene diamine, and why is the ortho-form of the diamine, and why is the ortho- form of the diamine a hindering impurity that must be rigorously removed before the production of Kevlar and Nomex?
3 State what happened when 2 drops of concentrated hydrochloric acid are added to the bromophenol blue indicator. Explain the change in terms of equilibrium.
What is the hybridization scheme for the central atom in the following?
Mg3N2(s) + 3 H2O(l)= 3 MgO(s) + 2 NH3(g) How many moles of Magnesium oxide are produced by the reaction of 3.82g of Magnesium nitride with 7.73g of water?
Dissolving NH4NO3 in water is an endothermic process. In fact, this reaction is often used in cold packs sold at the drug store. When 23.8 g of NH4NO3 was rapidly dissolved in 79.5 mL of water in a coffee cup calorimeter,
Draw the major and minor products generated in the reaction of 1-Bromo-3methylene-cyclopentane in methyl alcohol and heat.
determine the initial concentration - Constant rate is 3.20×10-4 M/s for a zero-order reaction. concentration has dropped to 9.00×10-2 M after 60.0 seconds
A 0.0050 molar solution of sugar is separated from pure water by a membrane at 20 C. What is the osmotic pressure?
how much heat is absorbed when 63.7g h2o at 100 c and 101.3 kpa is converted to steam at 100 c.
A 4.20 g nugget of pure gold absorbed 290 J of heat. What was the final temperature of the gold if the initial temperature was 25.0°C? The specific heat of gold is 0.129 J/(g·°C).
vitamin tablet contains 125 mg of vitamin C (C6H8O6). How many vitamin C molecules are contained in the tablet?
benzoic acid in water is 6.8g per 100ml at 100 degrees c, and .34 per 100ml at 25 degrees c. calculate the minimun volume of water needed to dissolve 1.00g of benzoic acid.
Hydrogen is collected over water at .975 atm and 28 degrees Celsius. What is the partial pressure of H2?
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