Chicken noodle soup is classified as a mixture. This classification is because the soup consists of various ingredients that retain their individual properties. In a typical chicken noodle soup, you will find components like chicken, noodles, vegetables (such as carrots and celery), and broth. Each of these ingredients can exist independently and can be separated from the soup.
In contrast, pure substances have a uniform and definite composition, meaning they cannot be separated into simpler substances by physical means. Examples of pure substances include table salt (sodium chloride) and water (H2O). Compounds are also pure substances, but they consist of two or more elements chemically combined in a fixed ratio, such as carbon dioxide (CO2). Unlike compounds, the components in a mixture do not chemically bond and can be mixed in various proportions.
Therefore, since chicken noodle soup is made up of various ingredients that can be physically separated and do not form a single chemical entity, it fits perfectly into the category of a mixture.