A substance that is physically mixed but not combined chemically; can be separated into its individual components.

The physical properties of a substance are changed, but not the chemical properties.

Property that is directly related to the chemical composition of a substance.

Matter in a chemical reaction or physical process is not created or destroyed.

A chemical substance known as a "simple sugar", composed of carbon, hydrogen and oxygen atoms, that is an important, basic energy source for organisms.

The process where a substance undergoes a chemical change to form a new substance with a different molecular structure.

A substance that is made up of only one component.

Building blocks of matter, basic unit of chemical elements, such as hydrogen, oxygen, carbon.

The original substances in a chemical reaction-the inputs.

The unique, repeating arrangement of atoms (and their bonds) for a molecule.

One of the main components that make up all food.