In the pre-lecture we saw that FT-IR spectroscopy probes molecular vibrations, treating the molecule like a series of masses on springs. In this model, the spring constant k is related to the strength of the bond. The equation describing the vibrational frequency of a mass-spring system is:

v= 1/ 2π √K/μ

Where v is the vibrational frequency, k is the spring constant and u is the reduced mass. From this justify the following trend in IR absorptions for alkyl halides.

Bond Absorption Position(cm^-1)
C-F 1000-1400
C-Cl 600-800
C-Br 500-600
C-l 500

mechanics (greek   is that area of science concerned with the behaviour of physical bodies when subjected to forces or displacements, and the subsequent effects of the bodies on their environment. the scientific discipline has its origins in ancient greece with the writings of aristotle and archimedes[1][2][3] (see history of classical mechanics and timeline of classical mechanics). during the early modern period, scientists such as galileo, kepler, and newton laid the foundation for what is now known as classical mechanics. it is a branch of classical physics that deals with particles that are either at rest or are moving with velocities significantly less than the speed of light. it can also be defined as a branch of science which deals with the motion of and forces on objects. the field is yet less widely understood in terms of quantum theory.

explanation:

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.