2. ... Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. The need for balanced chemical equations is dictated by the law of conservation of mass. 3. A chemical reaction is, by definition, one in which chemical substances are transformed into other substances, which means that chemical bonds are broken and formed so that there are changes in the relative positions of atoms in molecules. our editorial process. This is the definition of chemical property as well as examples of representative chemical properties of matter. At the same time, there are shifts in the arrangements of the electrons that form the Cooking and making ice are chemistry as well as medicines and paint. cal (kĕm′ĭ-kəl) adj. For example, this is an unbalanced equation: N 2 + O 2 —> NO. ... Dr. Helmenstine holds a Ph.D. in biomedical sciences and is a science writer, educator, and consultant. Chemical indicator, any substance that gives a visible sign, usually by a color change, of the presence or absence of a threshold concentration of a chemical species, such as an acid or an alkali in a solution. She has taught science courses at the high school, college, and graduate levels. chemical bond synonyms, chemical bond pronunciation, chemical bond translation, English dictionary definition of chemical bond. The law states that the quantity of each element involved in a chemical reaction does not change. Of or relating to chemical weapons: chemical warfare. 2. n. 1. Of or relating to chemistry. Chemical definition is - of, relating to, used in, or produced by chemistry or the phenomena of chemistry. See more. A substance with a distinct molecular composition that is produced by or used in a chemical process. How to use chemical in a sentence. Define chemical bond. A drug, especially an illicit or addictive one. The indicator changes color when it reaches a critical range of values. She has taught science courses at the high school, college, and graduate levels. Chemical change definition, a usually irreversible chemical reaction involving the rearrangement of the atoms of one or more substances and a change in their chemical properties or composition, resulting in the formation of at least one new substance: The formation of rust on iron is a chemical change… Chemistry is a branch of science that studies what everything is made of and how it works. Chemistry definition, the science that deals with the composition and properties of substances and various elementary forms of matter. Bringing science to rural classrooms. Learn the definition of a chemical change as the term is used in chemistry and discover examples of chemical changes. our editorial process. Of or relating to the properties or actions of chemicals. 1. 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