Draw the structures of the following covalent molecules. Label the atoms clearly.
Show the electronic configurations of the outermost shells only.
1. NHCI2
2. SiO2
3. SO2
4. BF3
5. CF2H2 Please draw properly would be really helpful.

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.

answer:

technetium is the most reactive. this is followed by silver. the least reactive out of these three elements is strontium.