8th Grade Chemistry Review

Front

Why do all bonds form?

Back

To fill the outermost energy level.

Front

What is a valence electron?

Back

Electrons in the outermost energy level.

Front

What is matter?

Back

Anything that has mass and takes up space.

Front

How many elements are represented in the compound Na2CO3?

Back

3

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance.

Front

What is a chemical bond?

Back

A lasting attraction between atoms that enables the formation of chemical compounds.

Front

What is an atom?

Back

The basic unit of a chemical element.

Front

What is the periodic table?

Back

A tabular arrangement of the chemical elements, organized by their atomic number.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.

Front

What is a compound?

Back

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