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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.


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.


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.


Natural indicators relate information by demonstrating shifts in color to inform observers of whether materials are acidic or basic. The indicators, which are plants containing useful chemicals relative to pH levels, do not provide a numeric value for acidity or baseness. Common natural indicators a


Water is a chemical because it is made of matter. Matter is any object that takes up space and has mass. Although water is a liquid, it still has mass and occupies space.


Development indicators show the progress that has been made in a particular area, such as health, education or gender equality. Development indicators are represented by indexes and are useful tools for meeting development objectives.


An arrow that points in both directions in a chemical equation is showing that the reaction is reversible and can proceed in both directions. This means that the reactants on the left hand side are also the products of those on the right and vice versa.


The systematic names for water, as determined by the International Union of Pure and Applied Chemistry (IUPAC), are water and oxidane, although water is the more commonly used term by chemists. The traditional name has been retained for ease of communication.