Chemistry Unit 1

The problem that one tries to solve in the experiment

One or more assumptions put forth to explain observed phenomena

The variable changed in the experiment

The measure of the independent variable

The variable that stays the same

The group not being exposed to the variable

The fundamental unit of which elements are composed

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

A collection of atoms bonded together that behave as a unit

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

Characteristics of a substance that can change without the substances becoming a different substance

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

A change in the form of a substance that does not affect the composition of a substance

The change of substances into other substances through a reorganization of the atoms; a chemical reaction

A substance with variable composition

A substance with pure composition; a pure element or pure compound

A mixture that is the same throughout

A homogeneous mixture

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

A method for seperating the components of a liquid mixture that depends on the different boiling points of the substances

A method for seperating the components of a mixture containing a solid and a liquid

The certain digits and the first uncertain digit of a measurement

Getting an answer closest to the accepted answer; normally depends on the instrument used

Getting the same answer repeatedly; normally depends on person taking the measurements