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A certain batch of fireflies were observed to "flash" at the rate of 10.9 times per minute at 25°C and at the lower rate of 5.9 times a minute at a temperature of 15°C. Assume that the flashing is the result of an overall chemical reaction that has a single rate limiting step with the highest activation energy. Use this data to estimate the activation energy for this slowest step. You can assume that the concentrations of "reactants" in the fireflies do not depend on temperature.
The molar solubility of AgBr in water is 7.31x10^-7 mol dm^-3 at 25C. What is the standard potential of the cell Ag(s)/AgBr(aq)/AgBr(s)/Ag(s) at that temperature
The kidneys function to eliminate ammonia from the blood. Based on the pK value, what is the molecular form that predominates in the blood? Could this molecule easily diffuse through the ehydrophobic lipid membrane of a kidney cell? Explain.
Chemical reaction calculations, 1. Unbalanced equation SOCL2(1) + H2O(1) --- SO2(g) + HCl(g). How many molecules of H2O can 35.0 grams of thionyl chloride remove?
How much heat is absorbed when 45.00 g of carbon reacts with SO2 to produce CS2 and CO according to the following reaction? 5 C (s) + 2 SO2 (g) ? CS2 (l) + 4 CO (g) ?H° = 239.9 kJ
Tungsten (W) metal, which is used to make incandescent bulb filaments is produced by the reaction
Determine the theoretical and percent yields of ethanol if 684 g sucrose undergoes fermentation and 349 g ethanol is obtained?
Balance the following equation in acidic solution using the lowest possible integers and give the coefficient of water. MnO4-(aq) + H2C2O4(aq) ? Mn2+(aq) + CO2(g)
What mass of NaOH (s) must be added to 1.0 L of 0.050 M NH3 to ensure that the percent ionization of NH3 is no greater than 0.0010%? Assume no volume change on addition of NaOH.
A solution contains a mixture of pentane and hexane at room temperature. The solution has a vapor pressure of 268 {rm torr}. Pure pentane and hexane have vapor pressures of 425 {rm torr} and 151 {rm torr}, respectively, at room temperature. What i..
Trichloroacetic acid (CCl3CO2H) is a corrosive acid that is used to precipitate proteins. The pH of a 0.050 M solution of trichloroacetic acid is the same as the pH
Sketch the titration curve for carbonic acid H2CO3. Plot pH on the ordinate axis and relative equivalents of base added on the abscissa axis. Using this figure, indicate what the major species of the carbonate buffe
a chemical reaction occurs between solutions of rbcl and silver nitrate. this reaction produces a precipitate that is
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