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There are two common polymorphs of zinc sulfide: cubic and hexagonal. Based on the analysis of Madelung constants alone, predict which polymorph should be more stable. Assume that the Zn-S distances in the two polymorphs are identical.
Chemical reactions are typically faster when a catalyst is added. This is because... 1. Molecules are moving faster when a catalyst is added
What is the concentration of an ammonium chloride solution prepared by using 0.5L of water to dissolve the product of the reaction of 1.25 L of ammonia gas at 22 degrees C
Lithium iodide has a lattice energy of and a heat of hydration of. Determine how much heat is evolved or absorbed when 40.0 of lithium iodide completely dissolves in water.
Maintenance of pH is vital to the cells of all living organisms because enzyme activity is influenced by pH. What is the intracellular pH range of most cells?
What current is required to produce 91.6 g of chromium metal from chromium(VI) oxide in 12.4 hours?
What is the limiting reactant? b) How many grams of magnesium hydroxide can be theoretically obtained? c) If only 2.009g of magnesium hydroxide are obtained, what is the percent yield of the reaction?
Consider a galvanic (voltaic) cell that has the generic metals X and Y as electrodes. If X is more reactive than Y (that is, X more readily reacts to form a cation than Y does),
If 50.0g of sulfuric acid is spilled, what is the minimum number of moles of sodium carbonate that have to be added to it to complete this reaction?
A hydrogen-filled balloon was ignited and 1.50 gram of hydrogen reacted with 12.0 g of oxygen. How many grams of water vapor were formed?
What is the average rotational energy assuming that only J=0 to 4 levels are populated in the vibrational ground state n=0?
A latex balloon, inflated to an excess pressure of 1kPa and a radius of 30cm, is attached to a smooth nozzle, initially stoppered. The stopper is removed, and the balloon deflates in 5 seconds.
A process stream contains mostly light species 1 and heavy species 2 . A relatively pure liquid stream containing mostly 2 is desired, obtained by a single-stage liquid/vapor separation
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