Practice Flashcard: Elements, Compounds, Mixtures

Front

What is a mixture?

Back

A mixture is a combination of two or more substances where each substance retains its own properties. Examples include salad and air.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements chemically bond together. Examples include water (H2O) and carbon dioxide (CO2).

Front

What is an element?

Back

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

Front

What distinguishes a homogeneous mixture from a heterogeneous mixture?

Back

A homogeneous mixture has a uniform composition throughout, while a heterogeneous mixture has a non-uniform composition. Example: saltwater (homogeneous) vs. salad (heterogeneous).

Front

What is a molecule?

Back

A molecule is the smallest unit of a chemical compound that retains its chemical properties, consisting of two or more atoms bonded together.

Front

What is the difference between a compound and a molecule?

Back

A compound is a type of molecule that contains at least two different elements. A molecule can consist of the same or different elements.

Front

What is a pure substance?

Back

A pure substance is a material that has a constant composition and consistent properties throughout. Examples include distilled water and pure gold.

Front

What is a chemical bond?

Back

A chemical bond is the force that holds atoms together in a compound or molecule. Types include ionic bonds and covalent bonds.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numbers to indicate the ratio of atoms.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture where the components are not uniformly distributed, and different parts can be seen. Example: a bowl of cereal.