Science Quiz on Elements and Compounds

A pure substance containing only one kind of ___________.

An element is always uniform all the way through (homogeneous).

An element ___________ be separated into simpler materials (except during nuclear reactions).

Over 100 existing elements are listed and classified on the _______________.

A pure substance containing two or more kinds of _____________.

The atoms are _____________ combined in some way. Often times (but not always) they come together to form groups of atoms called molecules.

Compounds _______________ be separated by physical means.

Two or more _______________ or _______________ NOT chemically combined.

• substances

• elements

Mixtures can be uniform (called ____________________) and are known as solutions.

Mixtures can also be non-uniform (called ____________________).