is the study of composition, structure, and properties of matter and the changes it undergoes.

anything that occupies space and has mass

is composed of particles packed so loosely that it has neither a defined shape nor a defined volume.

is composed of particles that are tightly packed and have a regular arrangement. It has a definite shape and volume.

is composed of particles whose arrangement and packing are somewhere between those in solid and gas. It has definite volume but no specific shape.

is a form of matter that has a definite composition and distinct properties

It occurs at ultralow temperature, close to the point that the atoms are not moving at all.

combination of two or more substances in which the substances retain their distinct identities.

pure substances that contain two or more elements combined in a definite proportion by mass

contains particles that retain their chemical properties when they are mixed and can be distinguished after they are mixed.

are those changes that do not result in the production of a new substance (melting, freezing, breaking, crushing, cutting)

are those changes that result in the production of another substance (digestion, respiration, burning, rusting)

properties that lead to changes in the identity and composition of a substance. (heat of combustion, flammability, acidity, reactivity)

properties that can be measured without changing the identity and composition of a substance. (color, density, boiling point, melting point)

properties that depend on the size of the sample involved (mass, length, volume)

the extent or measurement of bounded surface

the amount of space that a substance or object occupies, (m³)

is the simplest form of matter since it contains only one kind of atom.