Explore BrainMass

Inorganic Chemistry

Advanced inorganic problems

1. Identify the conjugate acids of the bases C5H5N (pyridine), HPO42-, O2-, CH3COOH, [Co(CO)4]-, CN-. 2. Use Pauling's rules to place the following acids in order of increasing acid strength: HNO2, H2SO4, HBrO3, and HClO4 in a nonlevelling solvent. 3. Which member of the following pairs is the stronger acid? Give reasons for t

Concentration through Titration

1. Calculate the concentration of the HCl(aq) solution ( 25mL of .1M unstandardized HCl solution, 2 drops of phenolphthalein indicator used. Titrated with 15.2mL of sodium hydroxide solution) 2. Calculate the concentration of the Na2B4O7 solution two ways a) From the HCl titration of the Na2B4O7 solution ( 10mL of ~0.07M u

Peaks and Fragments with Mass Spectrum

Synthesis and Characterization of Mo2(O2CCH3)4 and K4Mo2Cl8: Compounds that contain Metal-Metal Quadruple bonds.  Procedure Place 2.0g of molybdenum hexacarbonyl and .10g of trimethylamine-N-oxide and a few boiling chips in the three-neck flask. Lightly grease the center neck of the flask and attach the reflux condenser t

Chemistry: Orbitals and Electron Configurations, deBroglie Wavelengths

The following 5 problems concern electron configuration, the shape of orbitals, and calculation of Bohr wavelengths. Please see the attached file for the fully formatted problems. 1. A hydrogen atom in a certain excited state has its electron in a 5f subshell. The electron drops down to the 3d subshell, releasing a photon in

Electron Configuration

Could you please write the electron configuration for the following substance, using the orbital notation. Bromine(Br)

Electron Questions

1. Explain how the degree of filling of an electron level in an isolated atom of molecule affects whether the resulting solid is an insulator, semi-conductor or metal. 2. Hence or otherwise compare the expected electrical conductivity of solid hydrogen with solid helium.

Valence and Conduction Bands

A material in its normal condition has an effectively full valence band and an empty conduction band. Explain why the material is strongly compressed causing the two bands to overlap and the material changes its behavior to become much like a metal.

Patterns in the Electronic Configurations of the Elements

Describe the patterns in the electronic configurations of the elements. Each row across the periodic table is called a period and the elements gradually change properties from left to right. Can you explain this in terms of the electronic configurations? Each column of the periodic table is called a family. Elements in t

Candy Experiment - Valence Electrons

Lab Experiment: Interactive Valence Shell Electrons 1. You will need a bag of colored candies such as "Skittles" or "M&M" You should have at least 80 pieces of this candy. You will also need eighteen index cards. Nine sheets of notebook paper torn in half will work as well as index cards. 2. Separate the candies by color.

Is water replaced or

The question arises concerning the density of saltwater: is it because water molecules have moved out of the system, replaced by sodium and chlorine ions, which are heavier, or have the ions moved into the interstices, creating a greater number of particles in the solution? By the gas laws, a cubic meter of gas always maintain

Chlorine Gas Preparation

Chlorine gas can be prepared in the laboratory by the reaction of manganese dioxide with hydrochloric acid: MnO2(s) + 4HCl(aq) --> MnCl2(aq) + 2H2O(l) + Cl2(g) How much MnO2 should be added to excess HCl to obtain 275mL of chlorine gas at 5.0C and 650 mmHg?

Inorganic Chemistry Problem Set

1. Write a balanced net ionic equation for the reaction of each of the following compounds with water. (a.) Na3PO 4 (b.) NaHSO4 (c.) (CH3)3NHCl 2. The following species are amphiprotic. Write the formulas of the corresponding conjugate acids and bases: (a.) HSe- (b.) PH3 (c.) HPO32- 3. For each of the following nona

Solubility Rules to write net ionic equations

Use the Solubility Rules to write net ionic equations for the reactions that occur when solutions of the following are mixed. Instructions 1. Write reactants and products in the following order: Cation + Anion = Precipitate 2. Use "->" (hyphen + greater than) to indicate 'yields' 3. Write subscripts as numbers with no

Half life

The half life of Cl is 9.5 x 10(exponent 12)s. How many atoms of Cl are present in a sample with an activity of 1.5 x 10(exponent 9) atoms/s a. 2.1 x 10(exponent 22) atoms b. 6.3 x 10(exponent 3) atoms c. 4.9 x 10(exponent negative 23) atoms d. 1.4 x 10(exponent 22) atoms e. 7.0 x 10(exponent 23) atoms

Finding precipitate formed.

For AgCl, what will occur if 250ml of 1.5 A 10^-13 M of NaCl is mixed with 250mL of 2.0 A 10^-7 M of AgNO3? a. A precipitate would form because Ksp>P b. A precipitate would form because P>Ksp c. No precipitate would form because Ksp>P d. No precipitate would form because P>Ksp e. No precipitate would form because P=Ksp


How many geometric isomers exist for FeCl4(CN)2(exponent 3 negative)?

Formation constant

The formation constant for Cu(NH3)4(exponent 2 positive) is 2x10(exponent 12). What is the ratio of Cu(NH3)4(exponent 2 positive) to Cu(exponent 2 positive) in 0.1M NH3?