IB Chemistry 1.1

A chemical element is a single pure substance, made of

• only one type of atom

• more than one type of atom

A compound is a

• chemical combination of different elements

• physical combination of different elements

A mixture is composed of two or more substances

• in which no chemical combination has occurred.

• in which a chemical combination has occurred.

The measure of the average kinetic energy of the particles of a substance is called

• temperature

• heat

• thermal energy

• kinetic theory

A mixture that has uniform composition and properties throughout is a

• homogeneous mixture

• heterogeneous mixture

A mixture that has a non-uniform composition, and therefore its properties are not the same throughout, is a

• homogeneous mixture

• heterogeneous mixture

The process by which the particles of a substance become evenly distributed as a result of their random movements is called

• diffusion

• effusion

• spreading

• homogenizing