Elements, Compounds, and Mixtures

Front

What is an element?

Back

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

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 combined. Example: Saltwater is a mixture of salt and water.

Front

How many elements are in the compound Na2CO3?

Back

3 (Sodium, Carbon, and Oxygen).

Front

What is a pure substance?

Back

A material made of only one type of particle, which can be either an element or a compound.

Front

What distinguishes a compound from a mixture?

Back

A compound has a fixed composition and properties, while a mixture can vary in composition and retains the properties of its components.

Front

What is the chemical formula for table salt?

Back

NaCl (Sodium Chloride), which is a compound formed from sodium and chlorine.

Front

What is the difference between homogeneous and heterogeneous mixtures?

Back

Homogeneous mixtures have a uniform composition throughout (e.g., saltwater), while heterogeneous mixtures have visibly different substances or phases (e.g., salad).

Front

What is the Periodic Table?

Back

A tabular arrangement of all known elements organized by their atomic number, electron configuration, and recurring chemical properties.

Front

What is a chemical bond?

Back

A lasting attraction between atoms that enables the formation of chemical compounds. Types include ionic and covalent bonds.