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Determine the atomic number and valence orbital that is filling for the element that would appear below thallium in the periodic table.
Can you predict the strength of an acid or base, (assuming you know it's an acid or base before hand), based on the number of Oxygen atoms or Hydrogen atoms in the substance?
A 3.00-g sample of a compound having the formula [CH2O] n is dissolved in water to form 100.0 mL of solution. The compound does not dissociate in solution into smaller components, and the solution d
If the charge on the metallic cation is known to be 2+, calculate the molar (atomic) mass of the unknown metal. Use the periodic table to identify this metal.
Propose a likley mechanism to explain for the first order reactioon and the production of compounds. Give the IUPAC names of the alkenes.
Two compounds A and B form an ideal solution at all compositions. If the vapor pressure of pure a at 80 degrees C is 860 mm and that of pure B is 350 mm, determine the composition of the liquid whic
Consider the analysis of manganese in flour by atomic absorption. A 0.1015g sample of flour digested with H2SO4 and then H2O2 and the digest solution was diluted to 50 ml.
Acid Phosphatase was assayed at [S] = 2x10-5 M. The Km for the substrate was 5x10-4 M. At the end of one minute 2.5% of the substrate, pNPP, had been converted to pNP (a product).
If a green leaf has an area of 2.75cm^2 and solar radiation is 1030 W/m^2, how many photons of solar radiation strike the surface of the leaf per second? Assume 3 significant figures and an average
Calculate the number of moles of Nitrogen dioxide that could be prepared from 0.35 mole of nitrogen monoxide and 0.25 mole of oxygen: 2NO(g)+O2(g) -> 2NO2(g)
What is the pressure (in atmospheres) inside a container of gas connected to a mercury-filled open-end manometer when the level in the arm connected to the container is 28.3cm higher than the level
Calculate the entropy change associated with the conversion of 0.75 moles of water at 50 Celcius to -10 celcius. The molar heat capacity of water is 75.3 J/mol celcius and the molar heat capacity of
A sample of gas contains 50.0% helium and 50.0% xenon by mass. What are the partial pressures of each gas when the total pressure is 750. torr? Hint: assume a 100. g sample of gas.
Magnesium ions can be precipitated from seawater by the addition of sodium hydroxide. How much sodium hydroxide in grams must be added to a sample of seawater to completely precipitate the 89.2 mg
Discuss briefly the similarites and differences between all known kinds of intermolecular forces. Use mathematical expressions to support your discussion.
What are the concentrations of hydrogen ion and acetate ion in a solution of 0.10M acetic acid, HC2H3O2? What is the pH of the solution? What is the degree of ionization? Ka = 1.7 x 10^-5
Calculate the change in enthalpy for the Mg HCl reaction using standard enthalpies of formation delta hf for HCl aq equals -167.2 kj and delta hf for MgCl2 aq equals -791.2 kj?
Vanadium is a transition metal that uses its s an d orbitals to form five bonds with fluorine atoms in VF5. What nonmetal could replace vanadium in VF5 without changing the geometry of the molecule?
A radioactive substance has a half-life of 46.5 minutes. How many grams of the radioactive substance will remain in a 822.4g sample after four hours have elapsed?
If 50 mg of phenacetin were dissolved in 100 mL of water, how much ether would be required to extract 90% of the phenacetin in a single extraction?
How could you improve the resolution (better separation) of chlorophyll a and b? Would this make the experiment take a longer or shorter amount of time?
What would you have observed if you had added a concentration solution of NaCl to the CoCl2/ Co(H2O)6 equilibrium system? Explain your answer in the terms of shifts or LeChatelier's principle.
Calculate Delta H degree rxn for the reduction of V2O5. The table is : V2O5(s) = -1550.6 DeltaH degree kj/mol : H2(g) = 0 DeltaH degree kj/mol : V(s) = 0 DeltaH degree kj/mol: H2O(g) -241.82 DeltaH
If the frequency of light emitted by potassium is 3.95 x1014 Hz, what is the corresponding wavelength associated with this frequency in nanometers?
How would you detect the presence of mercury in a sample potentially containing other group 1 cations? Detail the procedure and what the conformation presence test would be.