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Since methylene chloride and water to not mix, by wetting a piece of filter paper with water addition of both layers to the filter funnel results in the aqueous layer passing through the paper and the organic layer remaining in the funnel. This can be poured into another container, dried using sodium sulfate
(a drying agent) and the methylene chloride can be evaporated in the hood leaving behind the pure caffeine. Based on the mass of caffeine, you can now determine the % weight of caffeine in the original tablet. How does this compare with what the packaging states?
heptanol has the formula c7h16o and can be combusted in the presence of oxygen. if 15.0 g of heptanol is combusted in
During a recrystallization a student takes 1g of a white (colorless) solid and adds 5 mL of acetone. He heats the mixture in a boiling water bath and adds another
identify the functional group; and 3) and discuss general key chemical properties of the chemical that a fire, environmental, health or safety personnel should know.
Draw the product that is formed when the compound shown below is treated with an excess of hydrogen gas and a platinum catalyst.
assume that an escape velocity is 50 ms for an asteroid x but we also have asteroid y that has twice the radius and
A student heated 1.0L of ethanol (density 0.789 g/L) with 1.0 mL ethanoic acid (density 1.049 g/mL) with a sulfiric acid catalyst and noticed a vinegar-like smell to the product as well as a fruity medicinal smell.
Methane is burned in a Laboratory Bunsen burner to give CO2 and water vapor. Methane gas is supplied to the burner at the rate of 5.0 L/ min ( at temperature of 28° C and a pressure of 773 mm Hg).
A system that had work done on it but which receives or loses no heat from or to the surroundings has
What is the magnetic field strength of the NMR system in Tesla? Show all equations and explain. c) Are the resonances of A and B well enough resolved to be able to measure the relative concentrations by NMR? Explain reasoning.
An unknown element forms a yellow ion, XO . It forms a precipitate with silver ions. If 48.0 mL of a 0.250 mol/L solution of silver ions is added to a solution of the unknown ion, 1.856g of a red-brown precipitate are formed. Determine the iden..
Why should you never heat a cooled system, and how does this rule apply to distillation
How many moles of PCl_5 can be produced from 21.0 g of P_4 and excess Cl_2?
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