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Chemical indicators give off a visible sign when certain molecules are present. A common use of indicators is in determining the pH of a solution. Adding drops of methyl yellow to a basic solution turns the liquid yellow, but adding enough acid to neutralize it turns the indicator red.


Five indicators of a chemical change are color change, temperature change, precipitate formation, gas bubble formation and smell or taste change. Since some chemical products are poisonous, detecting a chemical reaction via smell or taste change is not recommended.


Harper College explains that forming a precipitate, color changes, gas formation and temperature change are signs of a chemical change. The University of California, Davis adds that the presence of odor also indicates a chemical change. There are only five indicators of a chemical change.


A chemical change is a process where two substances combine to form one or more new substances. This process is referred to as a chemical reaction, and it is not reversible.


Alterations to the electron-based ionic or covalent bonds between ions or atoms happen during a chemical change. Such changes result in one or more new substances with different physical and chemical properties. This type of change stands in contrast to physical changes which, despite sometimes clos


Chemical change is a change in a substance that transforms it into a different substance. Chemical change is distinct from physical change, which is a change in the physical features of an object without a corresponding change in substance. Heat, combustion and mixture of chemicals can all cause che


While physical change is the rearranging of molecules in a substance, a chemical change affects the intrinsic properties of a substance, altering its chemical composition.


Examples of a chemical change include rusting iron, burning wood, frying an egg and baking a cake. A chemical change occurs when the chemical composition of a substance changes irreversibly.


One example of a chemical change is the rusting of iron. An additional example is the digestion of food by the body. A chemical change is an irreversible change that involves reactants and the creation of new products.


Examples of chemical changes include burning of wood, digestion of sugar, an exploding firecracker, reactions between salts and acids and lighting a matchstick. A chemical change involves changes at the atomic and molecular level.