In chemistry, a chemical reaction is the process in which two or more substances combine to form one or more different substances. Chemical reactions can take place between two elements, for example between hydrogen and oxygen to form water; they can also take place between a compound and an element, such as iron reacting with chlorine gas to produce rust.
The word “chemical” means these reactions involve chemicals – that is, atoms that have been assembled into molecules. Keywords: organic molecules, chemical reactions, complex molecules Organic Molecules: The compounds of organic chemistry are the backbone of biological life.
They include carbohydrates, lipids (fats and oils), proteins, nucleic acids such as DNA and RNA. Organic chemicals make up a subset of these types that contain carbon-hydrogen bonds comprising linear chains or rings in various lengths with limited branching for example polymers like plastics or benzene ringed structures containing multiple carbons atoms.
Unlike most other substances found in nature which occur exclusively as one type of compound, many organic compounds can exist in different forms called allotropes due to variations in their molecular structure—an illustration is glucose at its address form hexagonal crystals when pure but also occurs amorphously on top