Elements, Compounds, Mixtures

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

How many elements are in the compound Na2CO3?

Back

3 (Sodium, Carbon, and Oxygen)

Front

How many atoms of oxygen are in carbon dioxide (CO2)?

Back

2 atoms of oxygen.

Front

What is the difference between an element and a compound?

Back

An element is made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded together.

Front

What are pure substances?

Back

Pure substances are materials that have a constant composition and consistent properties throughout. Elements and compounds are both considered pure substances.

Front

Can compounds be separated by physical means?

Back

No, compounds cannot be separated by physical means; they require chemical reactions to break down into their constituent elements.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition and appearance throughout, such as saltwater.

Front

What is a heterogeneous mixture?

Back

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