Determine whether each of the following statements is true or false. If the statement is false, modify and rewrite it so that it is a true statement.

a. When a molecule has two, degenerate, “infrared active”, vibrational modes, the two vibrational modes will show absorptions at different frequencies in the infrared spectrum.

b. For a given substance, strong intermolecular forces between molecules of the substance can cause peak broadening of some of the absorptions in the infrared spectrum of the substance.

Bonding is at the heart of chemistry. In chemical reactions, bonds are broken and new bonds are made. Individual atoms break free from their original bonding partners and interact and form bonds with a new bonding partner. All this happens nearly instantaneously. The interaction between the orbitals in two bonding atoms leads to molecular orbitals.

After thoroughly reviewing atomic orbital theory and molecular orbital theory, respond to the following:

• Explain how atomic orbitals interact and give rise to molecular orbitals.

Which of the following set of quantum numbers (ordered n, ℓ, mℓ, ms) are possible for an electron in an atom? Check all that apply.

3, 3, 1, -1/2

4, 2, -2, 1/2

-3, 2, 2, -1/2

3, 1, -2, -1/2

4, 2, -1, -1/2

5, 3, 0, 1/2

4, 2, 3, -1/2

2, 1, 0, 1

What does it mean when we say that a 0.15 M NaCl solution is isotonic with blood, whereas distilled water is hypotonic?

In a calorimeter, we added 50 mL of 1M HCl to 50 mL of 1.1 M NH3 which produces NH4Cl. If the temperature increased 5.0 degrees Celsius, what is the molar enthalpy? We weren't given a heat capacity for the calorimeter but it was made out of a glass beaker and the heat capacity of glass is 0.840 J/g^oC found on google.

(a) What does the term population inversion refer to with respect to a laser and (b) why is population inversion required for light amplification to occur?

For each of the compounds described by the following names:

1. Draw a three-dimensional representation.

2. star(*) each chirality center.

3. draw any planes of symmetry.

4. draw any enantiomer.

5. draw any diastereomers.

6 label each structure you have drawn as chiral of achiral.

(a) (S)-2-chlorobutane

(b) (R)-1,1,2-trimethylcyclohexane

(c) (2R,3S)-2,3-dibromohexane

(d) (1R,2R)-1,2-dibromocyclohexane

Calculate the concentrations of all species in a .377M Na2CO3 solution [CO32-]= [Na+] = [OH-]= [H+]= [HCO-3]= and [H2CO3]= SHOW ALL WORK PLEASE

Radioactivity lab using equation age=1/k ln(1+D/P)

k=decay constant; D= # of daughter atoms in sample (beans); P= # of parent atoms in sample (M&M's)

if you found a container with 20 M&M's and 50 pinto beans, how old would you estimate the sample to be

what concentration of Zn^2+ will remain when 200mL of 4.50*10^-3 M Zn(NO3)2 is combined with 200.0mL of .250 M NaOH? Kf of Zn(OH)4 ^2- = 2.0*10^15

A buffer contains 0.10 mol of propionic acid (C2H5COOH) and 0.19 mol of sodium propionate (C2H5COONa) in 1.20 L.

Part A. What is the pH of this buffer?

Part B. What is the pH of the buffer after the addition of 0.02 mol of NaOH?

Part C. What is the pH of the buffer after the addition of 0.02 mol of HI?

1: Discuss the vaporization of water in standard condition at 298 K in term of: -1A exothermicity and endothermicity -1B change of entropy of the system and the surrounding -1C spontaneity of the reaction. ------ 2- Explain how the temperature and the composition of the two phases (liquid and vapour) influence the spontaneity of the vaporization of water. Please show steps and give ample explanation. Thank you

4. calculate the Eocell for the Ni - Al cell.

For the Ni - Al cell in question 4 write the following reactions
5. Cathode Half Reaction:
6. Anode Half Reaction:
7. Redox Reaction:
8. Using your answer from question 4, determine the Ecell for a Ni - Al cell when the concentration of Al3+(aq) is 4.00 M and the concentration of Ni2+(aq) is 2.00 x 10^-5 M.

Pure (100%) sulfuric acid has a density of 1.84 g/ml. How many mL of sulfuric acid need to be diluted with water to a total volume of 500 mL to prepare a solution with pH=0.500