Chemistry definition test (chapter 2)

Matter

the material of the universe

Atom

the fundamental units of which elements are composed

Compound

a substance made of two or more different elements joined together in a specific way

Molecule

a collection of atoms bonded together that behave as a unit

Element

a substance that cannot be decomposed into simpler substances by chemical or physical means; it consists of atoms all having the same atomic number

Solid

one of three states of matter; it has a fixed shape and volume

Liquid

one of three states of matter; fits the shape of its container

Gas

one of three states of matter; a substance with no definite shape or volume

Physical Property

a characteristic of a substance that does not involve changing to another substance

Chemical Property

a characteristic that describes the ability of a substance to change to a different substance

Physical Change

a physical change involves a change in one or more physical properties, but no change in composition

Chemical Change

a chemical change transforms a substance into one or more new substances

Mixture

a substance with variable composition

Alloy

a mixture of elements that have metallic properties

Pure Substance

a substance with a constant composition- a pure element or pure compound

Homeogenous Mixture

a mixture that is the same throughout

Solution

a homeogeneous mixture

Heterogeneous Mixture

a mixture that has different properties in different regions of the mixture