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An indicator of a chemical reaction is something that suggests a chemical reaction is occurring. Inidicators of a chemical reaction include temperature change, color change, formation of a solid, formation of a gas, and light.
An example of light in a chemical reaction is fireflies, which have a chemical in their abdomen that, when reacted with oxygen, emits lights. The bug can control the emission of light by regulating the intake of oxygen.
When a chemical reaction produces heat, it is an exothermic reaction, causing a rise in temperature. An example of this would be when sodium hydroxide is dissolved in water.
When a chemical reaction absorbs heat it is an endothermic reaction, causing a decrease in temperature. An example of this would be when ammonium chloride is dissolved in water.
A chemical reaction is "a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction."
An example of color change in a chemical reaction would be when copper, which is a red-brown color, is reacted with water, oxygen, and carbon dioxide. It turns a green color. This is called hydrated copper carbonate.
An example of a formation of a solid, or a precipitate, would be reacting sodium carbonate with copper sulfate. This will form copper carbonate, which is a solid, as well as sodium sulphate, which will be in the solution.
An example of a formation of gas would be adding aqueous hydrochloric acid (HCl) and aqueous sodium sulfide (Na2S) to form a gaseous hydrogen sulfide (H2S) and an aqueous sodium chloride.