Definition: Additive is a chemical process that adds one or more elements to another compound, resulting in a new substance containing only those elements. For example, water (H2O) combines with hydrogen (H2) to form hydroxide (OH-), which contains only oxygen (O). Adding elements in this way results in compounds with multiple chemical properties, such as acids, bases, and alkali metals. The word "additive" is often used in chemistry to describe the chemical processes that combine different substances to form a new compound. For example, when adding sulfuric acid to sodium hydroxide, the resulting solution contains only hydrogen ions (H+), which are present on both sides of the reaction equation. Similarly, adding zinc metal to lead nitrate results in a mixture containing only magnesium and aluminum, which are two different elements. The term "additive" is often used with reference to chemical reactions that combine multiple substances or components to form a final product. It can also be used synonymously for other types of chemistry, such as the process of combining gas molecules (oxygen gas) to form nitrogen gas and water vapor. In summary, the word "additive" refers to the addition of elements to a compound in chemical processes, resulting in a new substance with only those elements present. The term is often used in conjunction with other chemistry concepts such as the formation of acids, bases, and alkali metals.

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