Passage #1 - chemical and physical changes
all matter, all things can be changed in two ways: chemically and physically. both chemical and physical
changes affect the state of matter. physical changes are those that do not change the make-up or identity
matter. for example, clay will bend or flatten if squeezed, but it will still be clay. changing the shape of clay
a physical change, and does not change the matter's identity. chemical changes turn the matter into a new kind
of matter with different properties. for example, when paper is burnt, it becomes ash and will never be paper
again. the difference between them is that physical changes are temporary or only last for a little while, and
chemical changes are permanent, which means they last forever. physical and chemical changes both affect the
state of matter.

what is this? cause and effect, problem and solution chronological, sequence