Write a scientific explanation to explain how atoms, molecules, and extended structures make up substances.

Pure substances are made up of a bulk quantity of individual atoms or molecules.

Each pure substance is made up of one of Individual atoms of the same type that are connected to form extended structures.

A chemical reaction happens when substances break apart or combine to form one or more new substances.

we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

po-215 i got it right on the quiz