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www.reference.com/article/chemical-indicator-d994396366d03222

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.

www.reference.com/science/causes-chemical-reactions-e0a11afda92e2466

Chemical reactions occur when two molecules collide with each other in a certain orientation and amount of force, which causes a chemical change due to the breaking and forming of the bonds between the atoms. Bonds are broken and formed due to the movement and sharing of electrons between atoms with

www.reference.com/article/chemical-reaction-mean-4b67c210311221b9

The term "chemical reaction" refers to any process that changes a set of chemical substances to another. That is, the substances that are put into a chemical reaction are different, on a molecular level, from those that result.

www.reference.com/article/example-chemical-reaction-b7af503af7604513

A chemical reaction occurs when a cake bakes. The materials in the batter are changed into a different substance. If the cake burns, that is a separate chemical reaction. In fact, any type of burning, such as a piece of paper or a stick of wood, is a chemical reaction.

www.reference.com/article/chemical-reactions-occur-5428df2e06b1ee1a

Chemical reactions occur because different types of molecules interact with each other to create new substances. Many of these interactions happen naturally and are not man-made. When one molecule interacts with another one, a chemical reaction occurs due to the breaking of old bonds and the forming

www.reference.com/science/happens-during-chemical-reaction-bb7f673f23253ab4

The molecules of one reactant are combined with those of another reactant to form a new substance during a chemical reaction. As the chemical bonds are broken, the positions of electrons change, resulting in a product with properties that are different from the properties of the reactants. Various t

www.reference.com/article/four-types-chemical-reactions-9b0a7b620c73c768

Synthesis, decomposition, substitution and double displacement are four types of chemical reactions. A synthesis reaction is when two or more reactants combine to form one product.

www.reference.com/article/chemical-reactions-release-energy-eec4d34f5bca44b2

Chemical reactions that release energy are described by Education.com as exothermic reactions, and their equations follow the form: reactants = products + energy. Examples of exothermic reactions are explosions, such as fireworks, or combustion, such as with engines. The reactants of exothermic reac

www.reference.com/science/chemical-reactions-produce-heat-992c83b02fb01a8e

Chemical reactions that produce heat are called exothermic reactions. Exothermic reactions involve physical or chemical changes that generate heat in various quantities, which is then dispersed into the surrounding environment. Exothermic reactions come in several forms, and require more energy to o

www.reference.com/article/chemical-reaction-involve-699ff829bfeec6b3

Every chemical reaction involves a change. A chemical reaction occurs when one or more molecules combine with another to form a new chemical. Without that chemical change, the result cannot be called a reaction.