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What's the difference between adding zinc metal to iodine with water and acetic acid vs. adding zinc metal to iodine with water without acetic acid?
Carbon monoxide is a common pollutant in urban environments. On one particular day, the air contains 5.5 mg of carbon monoxide per 1.000 cubic meter of air.
2.86 g of a mixture of butene C4H8 and butane C4H10 is burned in excess O2 to give 8.8g CO2 and 4.14g of H2O. What are the weight percents of butene and butane in the mixture.
The activation energy for a reaction A ----> B is 114.0 kJ/mol. If a catalyst increases the rate of reaction by a factor of 2.20 × 10^6 at 25.0 oC, what is the activation energy (kJ/mo
The specifictaions associated with a commercial spectrophotometer are: Diffraction grating with 600 groves per mm. Focal length,f, 330nm. Blaze angle, first order, 500nm. What is the reciprocal of t
An interference filter has an effective bandwidth of 10nm. Would it be feasible to employ such a filter to isolate the calcium emmission line at 422.7nm from the potassium emmission line at 404.4nm?
A current of 0.500 A is passed through an electrolytic cell containing molten MgCl2 for 2.00 h. Calculate the quantity of Mg metal formed at the cathode.
You accidentally poured salt into your large grind pepper shaker. This is the only pepper you have left and you need it to cook a meal, but you dont want the salt to be mixed in.
The general guideline for the onset of plastic deformation is a strain of 0.10%. What force is required to induce such a plastic deformation in a 0.50 cm diameter nickel rod?
A solution of KOH is prepared and is standardized against 0.5418 g of KHP. The phenolphthalein endpoint was reached by the addition of 25.91 mL of KOH. What is the molarity of KOH solution?
A 10ml sample of pure Orange Juice was diluted with 40ml of metaphosphoric acid solution. Then 10ml of diluted juice was titrated to an endpoint with 9.27ml of DCIP.
The reaction of dinitrogen pentoxide with ammonia to form water vapor and nitrogen is hypothetical in the gas phase because at temperatures greater than 200k, dinitrogen pentoxide readil converts to
At a given temperature, the equilibrim constant for the system studied in this experiment is 1.4e2. Suppose 100.0ml of 2.00e-3M KSCN was mixed with 100.0ml of 2.00e-3M Fe(NO_3_)^3.
A reaction vessel of volume 20.0 L contains 5.0 mol of nitrogen gas, 3.0 mol of hydrogen gas, and 2.5 mol of oxygen gas at 298 K initially. The gases react forming NH3(g) ammonia and H2O(l) water.
If you are using 15. mL of 6.0% H2O2 by mass (m/m), and you assume that the density of the solution is 1.0 g/mL and that all of the hydrogen peroxide decomposes according to the reaction:2H2O2(aq) -
Suppose you calibrated an apparatus by injecting 20.0 mL of air at 0.933 atm and 23.1.C into your apparatus containing 15. mL of water. The pressure in the apparatus is observed to change by 0.066 a
What is the biological advantage (in KJ per mole of energy released as heat) of complete aerobic oxidation comparred with anerobic glycolysis to lactic acid?
A scientist proposed the following equation of state: p= RT/Vm - B/Vm(squared) + C/Vm(cubed) Show that the equation leads to critical behavior.
A bottle of Acetaminophen (Tylenol) containing 75 tablets (325-mg each) sells for $2.29. Calculate the cost of one billion tablets. How many grams of Acetaminophen (Tylenol) are needed to make thos
Assuming that the air leakage is one-way (no outside air enters the oven), what fraction of the original mass of air in the oven is lost due to expansion?
You added 25 lambda of a mg/ml amino acid solution to 975 lambda of buffer. What is the concentration of the amino acid in the diluted solution?
Give your answer as an ordered set of numbers alpha, beta, gamma, ... Use the least possible integers for the coefficients. What is Delta H for the reaction represented by this equation?
The nonvolatile, nonelectrolyte solute aspirin, C9H8O4 (180.10g/mol), is soluble in diethyl ether CH3CH2OCH2CH3. How many grams of aspirin are needed to generate osmotic pressure of 6.70atm when dis
Nitrogen has a Henry's law constant of 8.42x10^-7 M/mmHg at 25degreesC when dissolving in water. If the total pressure of gas (N2 gas plus water vapor) over water is 1.0atm, what is the concentratio
The mole fraction of magnessium chloride, MgCl2 in aqueous solution is 7.55x10^-2. What is the percent by mass of magnessium chloride in the solution?