1- brilliant colors in fireworks are due to electrons within the colorant chemicals

a) mixing with water in the atmosphere

b) reacting with the ozone layer

c) falling back to the ground state

2- the electron of an atom that play an important part in the formation of compounds are usually those

a) the d subshell

b) an incomplete inner (inside) enegy level

c) a complete inner (inside) enegy level

d) a complete outer enegy level

e) an incomplete outer enegy level

3- what type(s) of intermolecular forces are present in ethanol? CH3 CH2 OH

a) London Dispersion forces

b) Hydrogen Bonding

c) Ionic bonding

d) Dipole-Dipole interaction

e) London Dispersion forces, Dipole-Dipole interaction & Hydrogen Bonding.

If the endpoint in a titration was reached using a volume of 37.60 mL and the concentration of the standard NaOH solution was 0.3214 M, how many grams of KHP were neutralized in this experiment? (MM of KHP = 204.23 g/mol)

Report your answer in grams but do not include units in your response.

please answer the following questions by typing, thanks.

1. How different is the measured volume from the volume if it had been obtained under STP conditions? Is the difference greater than an assumed measurement error of 5%? If not, why should we go to all this trouble to make this calculation?

2. All gases should have the same standard volume of 22.4141 L. If your value is different, then comment on the sources of error in the experiment.

3. What is the volume occupied by 11 moles of oxygen gas at STP?

4. What is the mass in grams of 10.0 L of methane (CH4) gas at STP?

1) GC-MS of your sample will result in a total ion chromatogram and a mass spectrum. Explain the information that each contains and label the axes.

a) Total Ion Chromatogram

b)Mass Spectrum

2) Antihistamine contains one of the active ingrediants below. Draw the chemical structure and give the expected m/z for the molecular ion.

a) Cetirizine b) Loratadine c) Diphemhydramine d) Chlorphenamine

What volume of CO2(g) will be formed when 2.0 g CaCO3(s) is heated and the gas is collected at 700 mm pressure and 20 ^oC? The reaction is: CaCO3(s) → CaO(s) + CO2(g)

A. 0.44 L                     B. 0.52 L                     C. 52 L                                    D. 3.61 L                     E. 22.4 L

What is the mass of CO2 in a 340. mL container when its pressure is 2.80 atm and the temperature is 57 ^oC?

A. 26.7 g                     B. 0.125 g                    C. 125 g                      D. 3.52 g                     E. 3.47x10^–4 g

Briefly discuss any source of errors in the HPLC Lab ''Liquid Chromatographic Analysis of Analgesic Powders''

•The persistent presence of O2 in the atmosphere is intimately connected with the removal of CO2 from the atm as part of the inorganic C cycle.

•What is the chemistry behind it?

•How is the geospheric cycle involved in this?

•We referred to this not as a simple cycle, but as a feedback loop. How does this feedback loop work?

Light from three different lasers (A, B, and C), each with a different wavelength, was shined on the same metal surface. Laser A produced no photoelectrons. Lasers B and C both produced photoelectrons, but those produced by B had a greater velocity than those produced by C. Arrange the lasers in order of increasing wavelength.

If A didn't produce any photoelectrons, Wouldn't it just be a straight line with the highest frequency? And to have a greater velocity would that mean the wavelength increases frequency?

Explain how solubility tests could be used to differentiate between:

a. a phenol and a carboxylic acid.

b. a phenol that contains electron-withdrawing groups and a phenol that contains electron-donating groups.

c. a carboxylic acid and an amine.

d. 1-bromooctane and dibutyl ether. e. 2-pentyne and pentane.

f. 2-nitropentane and 2-aminopentane.

A. 100ml of 0.5M acetic avid is titration with 20ml of 0.5M KOH. What is the pH of the acid before titration? (ka acetic acid is 1.8 x 10^-5)

B. What is the pH of the solution after titration?

calculate the wavelengths of the following: A) a muon (a subatomic particle with a mass of 1.884x10^-25g) traveling at 2.30x10^2 m/s B) an electron (m=9.10939x10^-28g) moving at 3.80x10^6 m/s in an electron microscope

What is a possible procedure I can use to determine the direct solubility of KHT following these guidelines?

1. Based on the principle of making a saturated solution, KHT is added until excess solid is formed. The room temperature needs to be recorded and kept to avoid solubility being changed by temperature duing preparation.

2. The excess KHT solid should be filtered.

3. Method of titration using a standard soltuion of NaOH.

4. Finally, how will you test the temperature effect on solubility of KHT?

Using electron configurations, shielding, and effective nuclear charge, explain why Mg has a higher ionization energy than Na and Al.

The line spectrum of helium has many more lines in it than the line spectrum of hydrogen. Draw orbital energy diagrams for both H and He, showing all orbitals up through n = 3. Use these diagrams to explain why helium’s line spectrum is so much more complex. They should differ in more than just the number of electrons!