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Changes in the character and concentrations of the ions will cause the reacting mixture's ability to conduct electricity to change.
When the composition of a mixture changes, the melting point and boiling point also change.
Since many chemical reactions have poisonous reactants or products, this method of detecting chemical change isn't recommended.
Sometimes energy is released by bond-forming reactions in the form of light. This occurs in most combustion reactions.
Density is a characteristic of a compound, and if new compounds are produced as other compounds are consumed in the reaction, the change in density can cause the reacting mixture expand or contract as the reaction proceeds. Sometimes this volume change can be large and very rapid- and an explosion occurs.
When there is more bond-making than breaking, the excess energy is released, making the surroundings hotter.
When mixing a pair of soluble reactants in solution, the sudden appearance of a solid that "rains down"(precipitates) into the bottom of the container is a sign that a reaction has occurred.
Every compound absorbs a characteristic set of colors of light. This absorption spectrum is a chemical fingerprint for detecting the presence of that compound.
Gas-producing reactions are complete when the gas can leave the reaction mixture. Gas can leave the mixture in the form of bubbles.