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A sample was placed on a chromatography column. Methylene Chloride was used as the eluting solvent. No seperation of the components in the sample was observed.
Write a balanced equation. Draw the reaction mechanism. Justify the species involved as nucleophiles, electrophiles, radicals, acids or bases.
Calculate how much AgCl is obtained by a precipitating the salt from 10.00 mL of 0.0500 M AgNO3 (aq) by adding an excess of 6 M HCl(aq), then tell why an excess of HCl(aq) is used. Please show all w
Suppose you construct a barometer filled with an oil (d=1.25g/cm3) in the vertical tube. If the atmosphere has a pressure of .95 atm, what is the approximate height of the oil in the tube?
What is the pressure in atmospheres on the body of a diver if he is 34 ft below the surface of the water when atmospheric pressure at the surface is 0.95 atm?
The nonstick polymer Teflon is made from tetrafluoroethylene, C2F4. if C2F4 is a gas that dissolves in water at 298 K to the extent of 1.01*10^-3 M with a partial pressure of 0.63 atm, what is the H
A hot air balloon has a volume of 4.00 x 10^5 L at 30 deg. C and pressure of 748 mmHg. If the avg molar mass of air is 29.0 g/mol, what is the mass of the hot air balloon?
Propane gas (C3H8) is used as a fuel in rural areas. How many liters of CO2 are formed at STP by the complete combustion of the propane in a container with a volume of 15.0 L and a pressure of 4.5 at
What partial pressure of hydrogen gas is required in order for 0.00426 g of the gas to dissolve in 20.7 mL of pure water? The Henry's law constant for hydrogen gas is 7.8 x 10 ^-4 M atm^-1.
You are given a small bar of an unknown metal X. You find the density of the metal is 10.5 g/cm^3. Another experiment tells you the edge-length of the face centered cubic unit cell of this metal has
Phosphorylation can also serve to activate or inactivate specific enzymes. Give an example of one amino acid that can be phosphorylated and suggest at least two ways that phosphorylation could contr
A mixture of 0.200 mol of NO2 and 0.200 mol of CO is placed in a 1.00L flask and given time to equilibrate. Analysis of the equilibrium mixture indicates that 0.134 mol of CO2 is present. Calculate
Experimental evidence suggests that the nitrogen atom in ammonia, NH3 has four orbitals in the shape of a pyramid or tetrahedron. Draw an energy level diagram to show the formation of these orbitals
What has happened to the concentration of ascorbic acid in the solution in the flask over this waiting period (before the titration.)? Show your calculations.
An old container of KOH has been found in the chemistry lab. Determine the percent purity of the sample of KOH found in the lab (Molar mass of KOH = 56.1 g/mol).
Determine the mass of MgC12 (Molar mass = 95.2 g/mol) that was added to the original 250 0 mL volumetric flask as well as the volume of AgNO3 solution used in the titration.
No animal is able to digest cellulose. Reconcile this statement with the fact that many animals are herbivores that depend heavily on cellulose as a food source. Be specific in your discussion.
A 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50 mL of distilled water in an Erlenmeyer flask. What mass of ascorbic acid has been oxidized by one of the components of air ov
When a 90 g sample of an alloy at 100.0 oC is dropped into 90.0 g of water at 24.6 oC, the final temperature is 34.1 oC. What is the specific heat of the alloy? (The specific heat of water is 4.184
Gallium-68 decays by positron emission, with a half-life of 68.3 min. How much 68Ga remains from a 10.0 mg sample after 683 min?
Photosynthesis in plants is two processes: the light reactions and the Calvin cycle. Compare the light reactions to the Calvin cycle of photosynthesis in plants.
Assume up and right are positive. A mass m is placed on the stool at M=(x,y). Find the force through each leg supporting the mass in terms of x,y,g and m.
Neither carbon tetrachloride nor trans CHBr=CHBr have dipole moments. Both have cery different molecular geometries. What are their molecular geometries, and why are they different?