From these three different syntheses, A, B and C. Of these three, one is reversible and the Le Chatelier principle needs to be applied to force product formation. Based on the descriptions of the three reaction procedures below, indicate which most likely takes advantage of the Le Chatelier principle. A: Two liquid reactants are mixed and stirred for about 10 minutes. As the mixture is stirred the solid product precipitates from the liquid reaction mixture. The solid product is recrystallized and the melting point taken. B: Two liquid reactants are mixed and stirred for one hour. At the end of the reaction period the mixture is extracted with sulfuric acid in water to leave the liquid product behind. The liquid product is characterized using IR spectroscopy. C: Two liquid reactants are mixed and stirred for one hour. At the end of the reaction period, the mixture is extracted with a solution of sodium hydroxide in water. The aqueous extract is acidified and the liquid product is then extracted from the aqueous layer with diethyl ether. The liquid product is isolated by drying the diethyl ether and removing it by evaporation. The liquid product is characterized using IR spectroscopy.  

There are very many different commercial polymers, one of these is polypropylene, which is used in many applications such as clothing. By looking at the repeating structures in polypropylene (below), choose the correct monomer that is polymerized to make this polymer.   Problem viewing the image, click here 

In the Aldol Condensation reaction shown below, Is the water a by-product or a side-product? Problem viewing the image, Click Here  

There are many selective reducing agents that are also not normally covered in a lecture course. One of these is sodium triacetoxyborohydride, NaBH(OAc)3. Shown below is a structure with both aldehyde and ketone functional groups. NaBH(OAc)3 will selectively reduce one of these two functional groups. Using the infrared spectrum provided below as evidence. What is the product of this reduction reaction, A, B, or C?   A.      B.      C.      Problem viewing the image, Click Here   IR Correlation Chart (see below)  

Shown below is an Aldol Condensation reaction. Which one of the following reactant is consistent with the following IR spectrum: A or B? A.      B.      Problem viewing the image, Click Here   IR Correlation Chart (see below)  

The pH of a solution containing 1×10−8 M HCl is 8

What is the pH of a solution containing [x]0 M H2SO4? H2SO4: Ka2 = 1.2×10−2 Enter your answer numerically to three significant figures.

What is the pH of a solution containing [x]0 M C5H5NHCl? C5H5N: Kb = 1.5×10−9    Enter your answer numerically to three significant figures.

The conjugate acid of H2PO3− is HPO32−

The next ten questions do not correspond to the reaction above. They are independent of each other.