Which of the compounds below is an example of a network solid? o sg(s) sio2(s) mgo(s) nacl(s) o c25h52(s)

SiO₂(s) is an example of a network solid.

Explanation:

Network solids, also known as the covalent network solids, are the class of chemical compounds in which the constituting atoms are bonded covalently to form a continuous network, which extends through the material. In a network solid, there are no individual molecules and thus the whole solid is called a macromolecule.

Some of the examples of network solids are diamond and quartz.

Quartz or silicon dioxide is a three-dimensional continuous network of SiO₂ units.

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.