The following molecule is the active ingredient in dark chocolate, known as theobromine and more commonly cocoa.  Which of the following atoms in this molecule is making an incorrect number of bonds?   

Compare the atoms Potassium (K) and Bromine (Cl) help to balance charges across membranes in the cell.  For K, the ionization energy is and the electron affinity is compared to Cl.   

Name the following molecule: CH3CH2CH2OH

Carbon tetrachloride, CCl4, used to be a primary component in fire extinguishers but was phased out due to toxicity upon prolonged exposure.  The chlorine atoms in the CCl4 molecule form bonds with the carbon and each chlorine has lone pairs of electrons.  The overall molecule has a geometry.

Match each molecule to its correct organic family. A. CH3CH2CH2CH2CH3 B. CH3CH2OH C. CH3NH2 D. CH3CH2SH

Which term best describes the relatively small portion of the enzyme that is directly involved in the biochemical reaction being catalyzed?

The enzyme HIV protease is responsible for activating proteins expressed by the Human Immunodifficiency Virus (HIV) which then attack the host immune system.  This protein has been the target of highly successful drug development in order to block HIV activity.  The image below shows a close-up of the active site of HIV protease bound to one of these drugs, showing specific intermolecular interactions.  The atoms making the interactions are labeled.  Match each interaction to its correct type.    

Draw a Lewis structure for the molecule N2.  The bond between the nitrogen atoms is best described as a _________________ bond.   

What mass (in grams) of ethanol can fill a 200.0 mL beaker if the density of ethanol is 0.789 g/mL?  

What is the molar concentration (M) of a solution that contains 10.0 g C6H12O6 in 500. mL solution? Molar mass: C6H12O6 = 180.2 g/mol