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a forensic laboratory and are given an unknown substance, a pale yellow powdery solid, and asked to evaluate its purity and to determine whether it might be identical to a given sample of an illegal drug, a white crystalline solid. Clearly explain what you would do, why you would do it, and how you interpret your results
Write a chemical equation describing the condensation process for CO2 and a chemical equation describing the freezing
what is the percent relative error? Please explain by showing work. Are these measurements more precise or more accurate? What is the purpose of repetition in measurements?
at 25 degrees C a saturated solution of a metal hydroxide has a pH of 9. What is the value of the solubility-product constant (Ksp) of M(OH)2 at 25 degrees C?
The rate constant of a reaction increases by a factor of 2 when the temperature is increased by 10C above room temperature (25C). Calculate the activation energy for this reaction.
The equilbrium constant for the decompositon at 25 degrees C is 2.3 X 10 ^ -4. At 25 degrees C , 7.5 g of NH4CO2NH2 is sealed in a 10 L flask and allowed to decompose.
What is the probability of locating an electron between x = 0 and x = 0.2 nm in its lowest energy state in a conjugated polyene molecule
How many grams of sodium fluoride should be added to prepare the buffer solution? Neglect the small volume chane that occurs when the sodium fluoride is added.
A reverse osmosis unit is to be used to concentrate the aqueous solution of metal complexes left over from a metal finishing operation. A pressure of 100 bar is exerted on the solution side of the membrane during concentration.
analysis. To a 500 mL air sample at 700 torr and 38 deg C, she adds 20.00mL of 0.01017 M aqueous iodine which reacts as follows:
A 29.0-g sample of ice at -11.0°C is mixed with 113.0 g of water at 71.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
In this experiment you will measure the heat of combustion (delta Hc) of naphthalene. Report the values of the following: Cv, the heat capacity of the system.
An aqueous solution of sodium chloride contains 4.50g of CaCl2, per liter. What is the molarity of CaCl2? When calcium chloride dissolves in water, the calcium ions
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