Students are studying how two substances react. The students mix substance 1 with substance 2 in a solution. Later the students
boil the solution, releasing substance 1 as a gas and leaving substance 2 as a solid. What type of change is described in the paragraph above? How do you know? This is a chemical change, because the two substances were mixed together.
This is a chemical change, because the two substances were separated chemically by boiling.
This is a physical change, because the two substances were separated physically by boiling.
This is a chemical change, because a gas was released.
Polymerization is a process through which a large number of monomer molecules react together to form a polymer. The macromolecules produced from a polymerization may have a linear or a branched structure.
Every atom has no overall charge (neutral). This is because they contain equal numbers of positive protons and negative electrons. These opposite charges cancel each other out making the atom neutral.
