Reteach: GA. S8P1a. Elements Compounds and Mixtures

Front

What is a pure substance?

Back

A material that has a constant composition and consistent properties throughout. Examples include elements and compounds.

Front

What is an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means. Examples include hydrogen (H) and oxygen (O).

Front

What is a compound?

Back

A substance formed when two or more elements are chemically bonded together. Example: Water (H₂O) is a compound made of hydrogen and oxygen.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded. Mixtures can be homogeneous or heterogeneous.

Front

What is a homogeneous mixture?

Back

A mixture that has a uniform composition throughout. Example: Saltwater.

Front

What is a heterogeneous mixture?

Back

A mixture that consists of visibly different substances or phases. Example: Salad.

Front

What are molecules?

Back

Groups of two or more atoms bonded together. They can be made of the same type of atoms (e.g., O₂) or different types (e.g., H₂O).

Front

What is the difference between an element and a compound?

Back

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

Front

What is an atom?

Back

The smallest unit of an element that retains the properties of that element. Atoms consist of protons, neutrons, and electrons.

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances. Example: Rusting of iron.