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Which isomer of 1-bromo-3-isopropylcyclohexane reacts faster when refluxed with potassium tert-butoxide, the cis isomer or the trans isomer? Explain your reasoning and draw the structure of the expe
What is the binding energy for a beryllium-9 nucleus? What is the binding energy, , for a beryllium-9 nucleus in ? Recall that . 1mev=1.60 x 10^-14
the water dissociation reaction H2O (l) --> H+(aq) + OH-(aq). What are the standard states for the three species in the two cases? Density of water is 997 kg/m^3.
What is the wavelength (in meters) of photons with the following energies? In what region of the electromagnetic spectrum does each appear? 91.0 kj/mol
The sun produces energy via fusion. One of the fusion reactions that occurs in the sun is How much energy in joules is released by the fusion of 3.06 of hydrogen-1
Unlike chemical reactions, for which mass is conserved, nuclear reactions result in slight changes in mass. When mass is lost, it becomes energy according to the equation where is the energy in joul
The reaction of pure (S)-2-chlorobutane with sodium cyanide in dimethylsulfoxide produces pure (R)-2-cyanobutane. Explain why a racemic mixture is not expected for this reaction if it occurs via an
What is the mole fraction of NaCl in this solution? what would be the vapor pressure of this solution at 45C? The vapor pressure of pure water is 23.8 torr at 25 C and 71.9 torr at 45C
Use bond enthalpy to estimate the enthalpy change for each of the following reactions: (a)H2C=O(g) + HCl(g) ---> H3C¬O¬Cl(g (b)H202(g)+2CO(g)
The precipitated Hg was removed by filtration. The product was isloated by diethyl ether extraction. After drying over Na2SO4, solvent was removed and distillation gave the product.
For carbon tetrachloride, the boiling-point constant is 5.03 C x kg/mol, and the boiling point of pure carbon tetrachloride is 76.50 C.
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3 -> NH4+(aq) + NO3(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal pl
Enter scientific notation as 1.23E4. (a) When 11.50 mL of 0.470 M HNO3 have been added. (b) When 65.00 mL of 0.470 M HNO3 have been added
Draw the Lewis structures for each of the following molecules or ions. Which do not obey the octet rule? (a) NO, (b) BF3, (c) , (d) OPBr3 (the P is the central atom), (e) XeF4
What is the mole fraction of NaCl in this solution. what would be the vapor pressure of this solution at 45C? The vapor presssure of pure water is 23.8 torr at 25C and 71.9 torr at 45C
Determine the molarity of each of the following. be sure to show the setups by which you get the answers. Na+ and SO3(2-) in .647 M Na2SO3 Ca2+ and SO4 (2-) in .035 M CaSO4
A 8.05-L container holds a mixture of two gases at 39 degree Celsius. The partial pressure of gas A and gas B, respectively, are 0.178 atm and 0.894 atm. If 0.210 mol a third gas is added with no ch
1) What would be produced if water was used instead of methanol for the transesterification (fats/oils with strong alkali solution) 2) How does burning biodiesel produce no net CO2 in the atmosphere
A scientist wants to make a solution of tribasic sodium phosphate, , for a laboratory experiment. How many grams of will be needed to produce 250 of a solution that has a concentration of ions of 0.
If each of the following gas samples have the same temperature and pressure, which sample has the greatest volume? A) 1 gram of O2 B) 1 gram of Ar C) 1 gram of H2 D) all have the same volume E) not
Suppose you prepared benzil by the oxidation of benzoin, describe how you could use TLC (thin layer chromatography) to decide when the reaction is complete.
Complete the equations that illustrate bicarbonate ion's capability to function as a buffer. a) HCO3^-1 + H+ --> ? b) HCO3^-1 + OH- -->
If I try to make a battery using copper and silver electrodes (along with the corresponding ionic solutions), will it work? Why or why not
The element chromium is thought to be a cancer causing agent. Chromium in the form of the chromate ion in a water soluble compound presents a risk to humans
Compute the partial pressure of Ar(g) that is needed to achieve this. You may assume that delta(vap)H for water is independent of temperature and pressure