If the patient has to be administered a dosage of 2 tablets every 8 hours for 7 days, what is the number of tablets required for the prescribed dosage

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.

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.