What is a chemical ?
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Chemical means involving or resulting from a reaction between two or more substances, or relating to the substances that something consists of chemical reactions that cause ozone destruction the chemical composition of the ocean.
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A chemical is any substance that has a defined composition. In other words, a chemical is always made up of the same "stuff." Some chemicals occur in nature, such as water. Other chemicals are manufactured, such as chlorine (used for bleaching fabrics or in swimming pools)....