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a.) Two groups of students prepared the compound acetamide. Group A isolated is a solid with a melting point of 80.5 degrees C. Group B obtained a compound with a melting point of 74-77 degrees C. When the students consulted the chemistry manual, acetamide was found to have a melting point of 82 degrees C. Which group prepared a more pure compound and why?
b.) The melting point of a solid may be defined as the temperature when both solid and liquid phases coexist. How may you define the boiling point of a substance?
c.) The boiling point of liquid is determined by heating it slowly and recording the temperature when the liquid vaporizes. Suppose a student doing the experiment heats the liquid up very rapidly. Is he likely to get the correct boiling point?
d.) The boiling point of a liquid on the pressure of its vapor over the liquid. Therefore the boiling point of water at the top of the Himalayan Mountain is lass than 100 degrees C. What is the melting point of ice on top of the Himalayan mountain?
A mass of mercury occupies 0.750 L. What volume would an equal mass of ethanol occupy? The density of mercury is > and the density of ethanol is 0.789 g/mL.
if a sample of gas has fixed volume, and under a standard atmosphere of pressure, if its temperature is raised from 20 degrees celsius to 40 degrees celsius
How many L of N2 gas are produced at STP when the airbag inflates if the airbag contains 132g of sodium nitride?
Standard potentials measured against the standard hydrogen electrode, Standard potentials are measured against the standard hydrogen electrode (S.H.E.). Because it is not always convenient to use a S.H.E
The standardized perchloric acid solution is then used to titrate 41.10 mL of a solution of sodium lactate (NaC2H5OCOO). An endpoint is reached when 18.22 mL of perchloric acid has been added.
If atmospheric pressure suddenly changes from 1.00 atm to 0.898 atm at 298 K, how much oxygen will be released from 3.10 L of water in an unsealed container?
in photosynthesis, plants use energy from the sun in combination with carbon dioxide and water to form glucose (C6H12O6) and oxygen. If 4.50 moles of water react with carbon dioxide, what mass of glucose is produced?
You are a hazmat responder and walk into what appears to be a meth lab. There are flasks of iodine, White Gas fuel, Sodium Hydroxide, Nitric Acid, and a box of ephidrine.
Example of reducing agent mechanism, Using Curved arrows to symbolize the flow of electrons, write the mechanism for the steps involved in the conversion of 9-fluorenone
Calculate the mass, in grams, of Ag2CrO4 that will precipitate when 50ml of 0.20M AgNO3 solution is mixed with 40ml of 0.10M K2CrO4 solution. Assume that Ag2CrO4 is completely insoluble (its Ksp is ~ 0).
5.00 mL of water sample was titrated for hardness with 4.15mL of 0.0200M EDTA. write the equastion for the reaction and calcualte the hardness of the water in ppm
What is the hydronium ion concentration in an aqueous hydrochloric acid solution that has a pOH of 11.540 ?
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