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Create a 5-step procedure you think will work to compare the efficiency of the light emitted by an incandescent light bulb to a fluorescent light bulb. Make sure to mention all the variables you think you'll have to control.
C2H5OH(aq)+2Cr2O7^2-(aq)+16H+(aq)---> 2CO2(g)+4Cr^3+(aq)+11H2O(l) What is the blood alcohol level in mass percent if 8.26mL of 0.04988 M K2Cr2O7 is required for titration of a 10.005g sample of blood?
Why is there a differance in the change in enthalpy and the change in internal engery for the zinc/hydrochloric acid reaction but not for the neutralization reactions
A helium-filled weather balloon has a volume of 2.4 × 102 L at 99 kPa pressure and a temperature of 0°C. What is the mass of the helium in the balloon?
The presence of a carboxyl band near 1640 cm-1 and two bands near 3000 cm-1 is good evidence of an alcohol B) The presence of a sharp, medium intensity band near 2720 cm-1 and a strong carbonyl band near 1700 cm-1 is good evidence of an alcohol
an archeologist unearths a skeleton of a mastodon. analysis shows the skeleton to a carbon-14 activity of 2 cmp counts
A gaseous mixture of O2 and N2 contains 39.8\% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 385mmHg
The osmotic pressure of a solution containing 26.5 mg of an artificial sweetener per liter is 1.70 torr at 30C. Calculate the molar mass of the compound.
The natural uranium/lead "clock" technique can be used to estimate the age of rocks. assume that at the time of solidification from the molten state a rock contained the radioactive isotope uranium-238. U-238 decays to a stable end product, lead-2..
The base solution was added to the acid solution but was not stirred while temperature measurement were not made: c.) Some of the base splashed out of the calorimeter while pouring:
The reaction CH3CH2NO2 + OH- → H2O + CH3CHNO2- obeys the rate law d[A]/dt = -k[A][OH-], where A denotes CH3CH2NO2. It takes 0.5 min for one percent of the A to react at 25°C.
For an electron in a hydrogen atom, compute the most likely radius (in Angstroms) of the electron in each of the following states:
a corrosion technologist pipetted a 100.00 ml hard water sample and titrated it with 37.64 ml of 0.01 m edta solution
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