Science Flashcard on Elements and Compounds

Front

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

Back

homogeneous

Front

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

Back

heterogeneous

Front

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

Back

cannot

Front

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

Back

periodic table

Front

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

Back

chemically

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded.

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together.

Front

What is the difference between an element and a compound?

Back

An element is a pure substance that cannot be broken down, while a compound is made of two or more elements chemically combined.

Front

What is the smallest unit of an element?

Back

An atom.

Front

What is a molecule?

Back

A group of two or more atoms bonded together.