HOMS Review: Changes in Matter

Front

What is a chemical reaction?

Back

A process that involves the transformation of one or more substances into different substances, often accompanied by energy changes.

Front

What is an example of evidence of a chemical reaction?

Back

When sugar is burned, it gives off an odor, turns brown, and then black.

Front

What is the smallest particle in an element or compound?

Back

An atom.

Front

What type of change is rusting metal?

Back

Chemical change.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances.

Front

What is a compound?

Back

A substance formed when two or more elements chemically bond together.

Front

What is an element?

Back

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

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout, such as salt water.

Front

What is a heterogeneous mixture?

Back

A mixture that consists of visibly different substances or phases, such as salad.