Chapter 15 Science: Classification of Matter

Substance

a type of matter with a fixed composition

Element

a substance made up of atoms that are all alike

Compound

a substance in which the atoms of two or more elements are chemically combined in a fixed composition

Heterogeneous mixture

A mixture in which different materials remain distinct

Suspension

a hetergeneous mixture made of a liquid and solid particles that settle

Colloid

is a hetergeneous mixture with particles that never settle

Homogeneous mixture

a mixture that remains constantly and uniformly mixed and has particles that are so small they cannot be seen

Solution

the same thing as a homogeneous mixture

Physcial Property

Any characteristic of a material that you can observe without changing the identity of the substance

Physical change

A change in size, shape, or state of matter in which identity of the substance remains the same

Chemical Property

Any charateristic of a material that you can observe that produces one or more new substance

Chemical change

A change of one substance to another

Law of conservation of mass

The mass of all substance that are present before a chemical change