Elements, Compounds, and Mixtures Test

heterogeneous mixture

A mixture consisting of parts that are noticeably different from one another ("poorly mixed"). ex: salad

homogeneous mixture

A mixture consisting of parts that are noticeably the same ("well mixed"). ex: brass

alloy

A solution in which one metal dissolved into another.

solution

A type of homogeneous mixture formed when one substance dissolves into another.

colloid

A type of mixture in which the particles are mixed but not dissolved. The particles are relatively large and are kept permanently suspended.

soluble

Able to be dissolved.

suspension

Like a colloid, the particles are too large to be dissolved, but will settle out eventually.

pure substance

Matter that always has exactly the same composition (elements or compounds).

insoluble

Not able to be dissolved.

chemical formula

One of the two ways to identify a compound. Uses subscript and does not involve a picture.

compound

Pure substance that is the union of 2+ elements. It can be broken into simpler substances by chemical means. ex: aspirin, capsaicin

atom

The basic building block of matter.

solubility

The measurement of the ability to be dissolved.

subscript

The numbers below the element symbols that show how many atoms of that element are in a compound.

element

The simplest pure substance, made of atoms, that can't be changed into a simpler substance by heating or any chemical process.

solvent

The substance in a solution that does the dissolving. Water is the "universal ______" ex: in a solution of water and salt, water is this

solute

The substance in a solution that is dissolved. ex: in a solution of water and salt, salt is this

molecule

Two or more atoms bonded together.

mixture

Two or more substances that aren't chemically combined with each other and can be separated by physical means. Substances in this retain their original properties.